Set 5 by

Set 5 by https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp Made with a lightning strike of genius en-us 2021-05-24 12:50:52 UTC 2024-11-10 15:05:43 UTC hello@padlet.com YiQing https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555731801 Good conductor of electricity
High milting and boiling point]]> 2021-05-25 00:40:48 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555731801 weifeng https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555734421 it is a good conductor of electricity
it has high melting pot boiling point]]> 2021-05-25 00:41:33 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555734421 Zane https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555734450 it is good conductor of electricity
It has high melting and boiling point ‘]]> 2021-05-25 00:41:34 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555734450 Zhu Haoming https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555737526 2021-05-25 00:42:40 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555737526 Han Yining https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555738033 It has high melting point.It is a good conductor of electricity.]]> 2021-05-25 00:42:51 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555738033 Leo https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555738385 It is soluble
The melting point is very high]]> 2021-05-25 00:42:59 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555738385 Joanne https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555739704 It has highmelting and boiling point.
It can conduct electricity in molten or aqueous solution. ]]> 2021-05-25 00:43:32 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555739704 yifan https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555739767 Good conductor of electricity.It has a high melting point ]]> 2021-05-25 00:43:33 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555739767 Gengercong https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555742370 Good conductor of electricity
High mp and bp

]]> 2021-05-25 00:44:34 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555742370 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555742480 weifeng
the magnesium atoms lose two electrons to form magnesium ion the sulfur atoms gain two electrons to form sulfur ion]]> 2021-05-25 00:44:37 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555742480 Zhu Haoming https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555742885 The bonding is ionic bonding.Magnesium atom transfer its valence electrons to the sulfide ions]]> 2021-05-25 00:44:46 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555742885 Yiqing https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555743958 Magnesium ion will lose 2 electron atom to sulfur and sulfur atom gain 2 electron To form magnesium sulfide]]> 2021-05-25 00:45:11 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555743958 Lei Yueer https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555744944 (a)It has a high melting and boiling point; it can conduct electricity in the molten or aqueous state

]]> 2021-05-25 00:45:34 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555744944 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555745505 weifeng

the magnesium atoms lose two electrons to form magnesium ion the sulfur atoms gain two electrons to form sulfur ion

]]> 2021-05-25 00:45:47 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555745505 LIMANHEI https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555746103 It has a high melting point and is an good electrical conductor]]> 2021-05-25 00:46:01 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555746103 Lei Yueer https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555746424 b)Magnesium atom gives two electrons to sulfur atom to form a magnesium ion, sulfur atom receive two electrons from magnesium atom to form a sulfur ion.]]> 2021-05-25 00:46:09 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555746424 LIMANHEI https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555747371 It has a high melting point and is an good electrical conductor]]> 2021-05-25 00:46:32 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555747371 yuanbo https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555750603 It is a good conductor of electricity
It has a high melting point]]> 2021-05-25 00:47:44 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555750603 Joanne https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555751898 The metal electron, magnesium, transfers its electron to the non-metal, sulfur atom, forming an ionic compound.
Magnesium lose electrons to form positive ions while sulfur gains electrons to form negative ions. ]]> 2021-05-25 00:48:13 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555751898 Leo https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555752094 Magnesium losses two electrons in order to form a magnesium ion and sulfur atom gets the ions from Mg to form nagetive sulfur ion. ]]> 2021-05-25 00:48:18 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555752094 Li Yi https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555754180 Magnesium atom gives two electrons to sulfur atom to form an ionic compound.Hence magnesium loses electrons becomes to magnesium ion, sulfur atom gains electrons becomes a sulfide ion.]]> 2021-05-25 00:49:04 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555754180 LIMANHEI https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555756780 Magnesium loses two electrons and transfers two electrons to sulfur]]> 2021-05-25 00:50:02 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555756780 Lei Yueer https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555757607 white precipitate of barium sulfate
white precipitate of calcium carbonate
no precipitate ]]> 2021-05-25 00:50:21 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555757607 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555764460 weifeng
white ppt of Ba S O4
white ppt of CaCO3
no ppt]]> 2021-05-25 00:52:39 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555764460 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555764632 Han Yining

Magnesium atom loss two electrons to sulfur atom to form magnesium ion, sulfur atom gain two electrons from magnesium atom to from a sulfur ion.]]> 2021-05-25 00:52:43 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555764632 Zhu Haoming https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555766548 White precipitate of barium sulfate
White precipitate of calcium carbonate
No precipitate

]]> 2021-05-25 00:53:25 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555766548 Joanne https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555767362 White precipitate of barium sulfate
White precipitate of calcium carbonate
No precipitate ]]> 2021-05-25 00:53:44 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555767362 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555767606 Magnesium lose two electrons transfer to sulfur and become magnesium ion ,sulfur gains two electrons becomes sulfide ion]]> 2021-05-25 00:53:50 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555767606 Leo https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555767671 White precipitate of Barium sulfate
White precipitate of Calcium carbonate
No precipitate

]]> 2021-05-25 00:53:52 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555767671 yiqing https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555768023 White precipitate of barium sulfate
White precipitateof barium carbonate
NO ppt

]]> 2021-05-25 00:53:59 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555768023 YuanBo https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555768501 1.white precipitate of barium sulfate
2.white precipitate of calcium carbonate
3.no precipitate ]]> 2021-05-25 00:54:12 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555768501 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555771747 Han Yining

White precipitate of barium sulfate.
White precipitate of barium carbonate.
No precipitate ]]> 2021-05-25 00:55:22 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555771747 LIMANHEI https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555773927 white ppt of barium sulfate
white ppt of calcium carbonate
no ppt

]]> 2021-05-25 00:56:07 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555773927 Lei Yueer https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555773951 I)It is to obtain the precipitate formed,which is lead (ll)bromide
II)It is to remove any potassium nitrate present.]]> 2021-05-25 00:56:07 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555773951 Yifan https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555775851 White ppt of BaSO4 White ppt of CaCO3 no ppt]]> 2021-05-25 00:56:50 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555775851 Li Yi https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555777235 White precipitate of barium sulfate
White precipitate of calcium carbonate
No precipitate]]> 2021-05-25 00:57:17 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555777235 Zane https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555778010 White precipitate of Barium sulfate is formed
White precipitate of calcium carbonate is formed
No precipitate ]]> 2021-05-25 00:57:33 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555778010 Leo https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555780025 （i)The students want to get a pure substance, so they do the filter in order to seperate the residue.
(ii)They want to remove the lead.

]]> 2021-05-25 00:58:12 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555780025 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555781390 weifeng
to separate the residue and filtrate and to filter off the residue]]> 2021-05-25 00:58:41 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555781390 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555782417 Raogenqiang
i. The student wants to filler off the other substances in liquid form from the lead(ii) bromide precipitate.
ii. To remove the impurities on the surface

]]> 2021-05-25 00:59:05 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555782417 Gengercong https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555783216 To obtain pure substance]]> 2021-05-25 00:59:22 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555783216 Zheng Ruyun https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555784505 A diluted solution of sodium hydroxide is added to the solution and slowly heated. If the root ions are present, they turn into ammonia gas, which turns the wet red litmus paper blue]]> 2021-05-25 00:59:52 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555784505 Joanne https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555785843 To obtain a pure substance of lead (ii) bromide ]]> 2021-05-25 01:00:20 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555785843 Zhu Haoming https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555786388 (I) It is used to remove excess water,
(II)It is used to get pure substance ]]> 2021-05-25 01:00:32 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555786388 Lei Yueer https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555786533 Add a few drops of aqueous sodium hydroxide to aqueous ammonium nitrite and heat the mixture.Ammonia gas is given off which turns moist red litmus paper blue.]]> 2021-05-25 01:00:35 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555786533 YuanBo https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555788893 The magnesium atom has 2+ electrons , it will lose 2 electrons from magnesium , the sulfur will gain 2 electrons from magnesium . ]]> 2021-05-25 01:01:19 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555788893 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555788970 to wash off the impurties on the residue and to get pure lead bromide]]> 2021-05-25 01:01:21 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555788970 Yifan https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555789886 1)Remove the excess substance which can’t dissolve in water
2)Wash off surface impurities]]> 2021-05-25 01:01:42 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555789886 Joanne https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555791402 ii) to rinse any impurities. ]]> 2021-05-25 01:02:15 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555791402 LIMANHEI https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555792663 In order to filter out the excess residue]]> 2021-05-25 01:02:42 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555792663 Zhu Haoming https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555793153 Add a few drops of sodium hydroxide and heat strongly.A pungent gas is released.This gas turns moisten litmus paper into blue]]> 2021-05-25 01:02:53 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555793153 Leo https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555793322 Add diluted sodium chloride and heat strongly then a gas come out which turns moist blue litmus paper into red.]]> 2021-05-25 01:02:57 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555793322 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555794797 Han Yining

It is used to remove the residue.
It is to remove the impurities.

]]> 2021-05-25 01:03:31 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555794797 LIMANHEI https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555799262 Add a drops of sodium hydroxide and heat strongly.A pungent gas is released.This gas turns moist litmus paper into blue]]> 2021-05-25 01:05:13 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555799262 YuanBo https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555800021 1. The student need to obtain the precipitate
2. The precipitate needs to get pure substance]]> 2021-05-25 01:05:30 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555800021 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555800179 add aqueous solution of NaOH and heat the solution gently a pungent smell is formed

]]> 2021-05-25 01:05:34 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555800179 Zhu Haoming https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555803421 (I) 0.0125 moles
(II)0.3 dm^3
(III)80 0.00625 g/dm^3]]> 2021-05-25 01:06:51 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555803421 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555805002 0.0125]]> 2021-05-25 01:07:27 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555805002 Yiqing https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555805337 Add sodium hrydroxide and heat. The red litmus paper turn blue]]> 2021-05-25 01:07:35 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555805337 yifan https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555805959 Add sodium hydroxide it will form a pungent gas and it will turn moist litmus paper into blue ]]> 2021-05-25 01:07:49 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555805959 Lei Yueer https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555806150 (I)0.5mol/dm^3*25.0*10^-3dm^3=0.0125mol
(II)0.0125*24dm^3=0.3dm^3
(III)64
32g/mol

]]> 2021-05-25 01:07:53 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555806150 Li Yi https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555806389 Add sodium hydroxide solution and heat strongly.A pungent gas is released and it will turns wet red litmus paper into blue.]]> 2021-05-25 01:07:59 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555806389 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555807343 0.3]]> 2021-05-25 01:08:20 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555807343 Joanne https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555808761 Add a few drops of sodium hydroxide. No precipitate forms and ammonia gas is released when heated. When the gas is released place a damp red litmus paper near it and it will turn blue. ]]> 2021-05-25 01:08:51 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555808761 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555809654 Han Yining

Add a few drops of NaOH and heat strongly. A pungent gas turns moist red litmus paper into blue is formed ]]> 2021-05-25 01:09:13 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555809654 Yiqing https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555809670 0.0125 mol
0.3 dm3]]> 2021-05-25 01:09:13 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555809670 Gengercong https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555809840 0.0125
0.3]]> 2021-05-25 01:09:18 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555809840 Joanne https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555810994 0.0125 mols]]> 2021-05-25 01:09:46 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555810994 Leo https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555812501 (I)25.0 cm3=0.025dm3
0.025dm3*0.500mol/dm3=0.0125mol
(II)0.0125*24=0.3 dm3

]]> 2021-05-25 01:10:22 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555812501 Li Yi https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555813528 (i)0.0125 moles
(ii)0.3 dm^3
(iii)Mr:64. Conc.=0.8 g/dm^3]]> 2021-05-25 01:10:47 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555813528 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555813654 Han Yining

0.0125
0.3
64, 32]]> 2021-05-25 01:10:50 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555813654 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555814078 64
32]]> 2021-05-25 01:11:01 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555814078 Joanne https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555814854 ii) 0.3 dm^3]]> 2021-05-25 01:11:19 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555814854 LMK muikiamphua1 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555815158 (b)(i)mole of ammonium nitrite= (25/1000) x 0.5= 0.0125
(ii) NH4NO2 : N2
1 ; 1
mole of N2 = 0.0125
vol of N2 = 0.0125 x24 = 0.3 dm3]]> 2021-05-25 01:11:26 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555815158 LIMANHEI https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555817870 (I)0.5*0.025=0.0125mol

(II)0.0125*24=0.3dm^3

]]> 2021-05-25 01:12:32 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555817870 Raogenqiang https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555819541 i. 2NH4NO3(aq) =4H2O(l)+2NO(g)
ii. When Ammonium nitrate gently heats with sodium hydroxide and aluminium sheets.
iii. the gas which turns red litums paper into blue is given out.]]> 2021-05-25 01:13:13 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555819541 Zane https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555822422 Add a few drops of sodium hydroxide to the aqueous sodium hydroxide and heat strongly,a pungent gas was released which turn moist red litmus paper into blue]]> 2021-05-25 01:14:18 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555822422 Leo https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555825109 (I)2NH₄NO_3(aq)=4H₂O_(I)+2NO_(g)
(Ii)Chemical Test:The nitrate ion can easily be identified by heating copper turnings along with concentrated sulfuric acid. Effervescence of a brown, pungent gas is observed which turns moist blue litmus paper red.
Results with ammonium nitrate:

]]> 2021-05-25 01:15:13 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555825109 YuanBo https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555827800 Add a few drops of sodium hydroxide into ammonium nitrate , it will no precipitate formed , the ammonia gas will turn moist red litmus paper blue]]> 2021-05-25 01:16:14 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555827800 Joanne https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555832709 iii) relative molecular mass of ammonium nitrate is 64
Concentration of ammonium nitrate is 32 g/dm^3]]> 2021-05-25 01:18:06 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555832709 Raogenqiang https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555834087 (a) They have the same 7 number of valence electrons
(b) Their reactivity decreases down the group. They always need to gain one electron to form a bonding with other elements, so when the numbers of electron shells increase they are get harder to gain an electron by intermolecular forces . ]]> 2021-05-25 01:18:39 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555834087 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555835252 weifeng
add Al （s）powder with warm NaOH （aq and heat strongly a pungent gas which turns moist red litmus paper into blue will be given off ]]> 2021-05-25 01:19:07 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555835252 Zhu Haoming https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555837005 (II)chemical test:Add aluminum power and sodium hydroxide and heat strongly
Result:A pungent gas which turns moist red litmus paper into blue is released]]> 2021-05-25 01:19:47 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555837005 Lei Yueer https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555840020 (I)2NH4NO3(aq)—————4H2O(l)+2N2O(g)
(II)add aqueous sodium hydroxide to ammonium nitrate solution, warm the mixture with a piece of aluminium foil
Effervescence is observed which turns moist red litmus paper blue

]]> 2021-05-25 01:20:52 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555840020 Zhu Haoming https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555843777 They have some valence electrons but different number of shells]]> 2021-05-25 01:22:15 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555843777 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555845759 1.0.0125 mol
2.0.3 dm^3
3.Mr=80 0.0125g/dm^3]]> 2021-05-25 01:23:01 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555845759 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555849765 weifeng
their valence electrons are all 7]]> 2021-05-25 01:24:28 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555849765 Joanne https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555851000 ii) Add aqueous sodium hydroxide followed by aluminium powder. Warm carefully and use damp red litmus paper to test for gas release.

The damp red litmus paper turns blue as pungent alkaline NH3 gas is released. ]]> 2021-05-25 01:24:56 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555851000 Leo 825255529 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555860829 (I)They have the same valence electrons which are seven.
(II)]]> 2021-05-25 01:28:29 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555860829 Han Yining https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555863105
chemical test:Add aluminum power and sodium hydroxide and heat strongly

Result:A pungent gas which turns moist red litmus paper into blue is released

]]> 2021-05-25 01:29:16 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555863105 Zhu Haoming https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555866002 W:silver

X:silver iodide

Y:sodium iodide

Z:sodium chloride

]]> 2021-05-25 01:30:19 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555866002 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555867508 weifeng
the reactivity decreases down the group
as the size of particles increase the valence electrons shell is away from necleus the attraction of the nucleus decreases

]]> 2021-05-25 01:30:53 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555867508 Raogenqiang https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555868419 (a)
W:silver metal
X:silver iodide
Y:sodium iodide
Z:sodium chloride
(b)
2NaI(aq)+Cl2(g)=2Nacl(aq) +I2(s)

]]> 2021-05-25 01:31:14 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555868419 Lei yueer https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555868560 (a)they all contain seven valence electrons
(b)the reactivity of the halogens decrease down the group as the size of the atoms increases and it is more difficult to gain electrons ]]> 2021-05-25 01:31:17 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555868560 YIQIng https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555873150 silver
silver iodide
sodium iodide
sodium chloride]]> 2021-05-25 01:32:58 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555873150 YuanBo https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555874802 1.2NH4NO3(aq)=4H2O(l)+2NO2(g)
2.add aqueous sodium hydroxide to ammonium nitrate solution, warm the mixture with a piece of aluminium foil

Effervescence is observed which turns moist red litmus paper blue

]]> 2021-05-25 01:33:35 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555874802 Lei Yueer https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555876434 W:silver
X:silver iodide
Y:sodium iodide
Z:iodine
(b)2NaI(aq)+Cl2(g)————2NaCl(aq)+I2(aq)]]> 2021-05-25 01:34:12 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555876434 Joanne https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555878597 Reactivity decreases down the group. It is because down the group the elements are less readily to lose electrons to form ions due to increase in the size of atomic radius ]]> 2021-05-25 01:34:58 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555878597 LIMANHEI https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555879273 decrease down the group]]> 2021-05-25 01:35:14 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555879273 Li Yi https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555881082 W:silver
X:silver iodide
Y:sodium iodide
Z:sodium chloride]]> 2021-05-25 01:35:53 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555881082 Zhu Haoming https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555881358 Coke reacts with oxygen to form carbon dioxide as C + O2 — CO2]]> 2021-05-25 01:36:00 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555881358 Leo 825255529 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555883707 W:Silver
X:silver iodide
Y:sodium iodide
Z:sodium chloride

]]> 2021-05-25 01:36:53 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555883707 LMK muikiamphua1 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555887875 Down the group, the atoms get bigger. The valence shell is further away from the nucleus. It becomes harder for the atom to gain an electron. So reactivity decreases down the group]]> 2021-05-25 01:38:26 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555887875 YuanBo https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555889337 Their outer electrons are same ,but their number of shell are different ]]> 2021-05-25 01:38:58 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555889337 Lei Yueer https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555891290 (a)the carbon in coke reacts with oxygen in air at the bottom of the furnace to form carbon dioxide ]]> 2021-05-25 01:39:43 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555891290 weifeng https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555891447 w Ag
x AgI
y NaI
z NaCl]]> 2021-05-25 01:39:46 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555891447 Zhu Haoming https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555895187 (I)+3
(II)Iron(III) oxide is reduced as the oxidation state of iron change from +3 in iron(iii) oxide to 0 in iron]]> 2021-05-25 01:41:05 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555895187 wei feng https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555896301 carbon react with oxygen from the hot air ]]> 2021-05-25 01:41:29 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555896301 Yiqing https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555896989 +3]]> 2021-05-25 01:41:44 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555896989 Yiqing https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555897947 carbon will react with oxygen ]]> 2021-05-25 01:42:03 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555897947 Han Yining https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555898533
They have some valence electrons but different number of shells]]> 2021-05-25 01:42:16 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555898533 YuanBo https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555899756 W: silver

X: silver iodide

Y: sodium iodide

Z: sodium chloride

]]> 2021-05-25 01:42:41 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555899756 Lei Yueer https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555899970 (I)+3
(II)iron oxide is reduced as the oxidation state of iron decreases from +3 in Fe2O3 to 0 in Fe]]> 2021-05-25 01:42:46 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555899970 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555900394 Han Yining

W:silver

X:silver iodide

Y:sodium iodide

Z:sodium chloride

]]> 2021-05-25 01:42:56 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555900394 weifeng https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555902241 +3
reduced
as its oxidation state decreases from +3 inFe2O3 to 0in Fe]]> 2021-05-25 01:43:37 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555902241 LIMANHEI https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555902348 W:silver

X:silver iodide

Y:sodium iodide

Z:iodine

]]> 2021-05-25 01:43:40 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555902348 wei feng https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555904517 the Air contains nitrogen and the nitrogengas has not been used]]> 2021-05-25 01:44:25 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555904517 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555905053 Han Yining

Carbon react with oxygen to form carbon dioxide by completely combustion.]]> 2021-05-25 01:44:36 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555905053 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555908198 Han Yining

+3

Iron(III) oxide is reduced as the oxidation state of iron change from +3 in iron(iii) oxide to 0 in iron

]]> 2021-05-25 01:45:43 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555908198 YuanBo https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555908773 1.+3
2.iron (lll)oxide is reduced as the oxidation state of iron change from +3 in Fe2O3 to 0 in Fe]]> 2021-05-25 01:45:55 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555908773 Lei Yueer https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555913555 Hot air which contains a large percentage of nitrogen gas enters the blast furnace at the bottom ]]> 2021-05-25 01:47:38 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1555913555 Lei Yueer https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567774269 (a)(I)the melting and boiling point of Group I elements decrease down the group,while that of Group VII elements increase down the group.
(II)the reactivity of group VII elements decrease down the group; the size of the atoms of Group VII elements increase down the group
(b)(I)one molecule of Group VII elements consists of two identical atoms that are chemically bonded together
(c)(II)In molten and liquid state, the cation and anions become mobile and are available to conduct electricity.But in solid state,the cations and anions are fixed in the giant lattice structure of ionic compounds,so they are unavailable to conduct electricity.]]> 2021-05-28 06:43:07 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567774269 ZHU HAOMING https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567777871 (A)G
(B)E
(C)D
(D)F and G
(E)H]]> 2021-05-28 06:45:30 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567777871 Liang Yecheng stevelyc2980 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567780181 (b)(i) It means their elements are formed by 2 atoms.
(c)(ii) In molten and aqueous state, sodium chloride exists as mobile sodium ions and chloride ions, hence it can conduct electricity. In solid state, it exists as molecules which do not have free ion or electrons, hence it cannot conduct electricity.]]> 2021-05-28 06:47:02 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567780181 weifeng https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567782699 for group 1，the melting and boiling point decreases
for group 7，the melting and boiling point increases
the reactivity decreases down the group
the physical state changes from gas to liquid then to solid]]> 2021-05-28 06:48:31 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567782699 Joanne https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567783484 a) I) In group I, the melting and boiling point decreases down the group. In group VII, the melting and boiling point increases down the group.Ii) Reactivity decreases down the group. Colour darkens down the group.B) I) the molecules can achieve a stable electronic structure. (two atoms in one molecule chemically bonded together) C) ii) sodium chloride has ionic bonding, the ions can move about in molten and in aqueous solution because the giant lattice structure has broken down. Electricity is conducted when ions move around freely. In solid state, the ions cannot move around because they are held strongly at the fixed positions by the electrostatic force in a giant lattice structure. ]]> 2021-05-28 06:49:00 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567783484 weifeng https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567785101 diatomic means that the molecule has two atoms in one molecule]]> 2021-05-28 06:50:07 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567785101 Zhu Haoming https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567788834 (A)(I)the melting points and boiling points for elements in Group I decrease down the group.the melting points and boiling points for elements in Group VII increase down the group
(II)the color for elements in Group VII changes from light to dark down the group.
the reactivity for elements in Group VII changes from high to low down the group
(B)(I)diatomic means elements existing as double atoms only
(C)(II)In solid state,ions cannot move.In molten and aqueous state,ion can move.]]> 2021-05-28 06:52:25 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567788834 Zane. https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567789733 a 2 The reactivity of group 7 elements decrease down the group
The colour of group 7 element become darker down the group
b 1 it means two atoms in one molecule chemically bonded together
c 2

]]> 2021-05-28 06:52:57 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567789733 weifeng https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567792352 as in molten and aqueous state it contains mobile
ions but in solid state it does not contain mobile ions]]> 2021-05-28 06:54:39 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567792352 Liang Yecheng stevelyc2980 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567792936 ele com mix eit
K L M,N O]]> 2021-05-28 06:55:03 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567792936 Lei Yueer https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567793073 Element:K
Compound:L
Mixture:M and N
Either a element or a compound:O]]> 2021-05-28 06:55:08 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567793073 YuanBo https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567796240 A)G
B)E
C)D
D)F , G
E)H]]> 2021-05-28 06:57:10 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567796240 Liang Yecheng stevelyc2980 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567796533 (a)
line 1: sulfric acid; potassium hydroxide
line 2: sodium hydroxide
line 3: magnesium oxide
line 4: copper(II) sulfate
(b) CuO+H2SO4---->CuSO4+H2O
(c)
1: filter the solution(if copper(II) oxide is excess), then pour the solution into a evaporation dish
2: heat genteelly to obtain saturated solution, let it to cool, crystals will start to form
3: wash with little cold water and dry between 2 sheets of filter paper]]> 2021-05-28 06:57:21 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567796533 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567796707 Han Yining
a) I) In group I, the melting and boiling point decreases down the group. In group VII, the melting and boiling point increases down the group.Ii) Reactivity decreases down the group. Colour darkens down the group.B) I) the molecules can achieve a stable electronic structure. (two atoms in one molecule chemically bonded together)
b）it means two atoms in one molecule chemically bonded together ]]> 2021-05-28 06:57:28 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567796707 Lei Yueer https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567797588 sulfuric acid. Potassium hydroxide
Sodium hydroxide
Magnesium oxide
CuSO4
(B)CuO+H2SO4=CuSO4+H2O
(C)add copper oxide powder to warm dilute sulfuric acid,stir until no further reaction
Filter the mixture
Pour the filtrate into an evaporating dish and heat gently til saturation
Allow the solution to cool,filter off the crystals formed
Sprinkle distilled water onto the crystals and dry them between sheets of filter paper ]]> 2021-05-28 06:57:58 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567797588 Leo https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567797901 The melting and boiling point decreases down the group.. ]]> 2021-05-28 06:58:12 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567797901 Li Yi https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567799035 (A)G
(B)E
(C)D
(D)F,G
(E)H]]> 2021-05-28 06:58:57 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567799035 man hei https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567799528 for group 1，the melting and boiling point decreases

for group 7，the melting and boiling point increases

the reactivity decreases down the group

]]> 2021-05-28 06:59:14 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567799528 Genqiang https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567800274 K element
L compound
M mixture
N mixture
O either an element or a compound ]]> 2021-05-28 06:59:45 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567800274 manhei https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567801213 K，M ，M and N ，O]]> 2021-05-28 07:00:18 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567801213 weifeng https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567803024 ele k
com l
mix m n
either o]]> 2021-05-28 07:01:24 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567803024 zheng ruyun https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567804683 (a)(i)It can have adverse effects on cell division and genetic information

]]> 2021-05-28 07:02:33 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567804683 MANHEI https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567804687 1.sulfuric acid.
2. Potassium hydroxide

3.Sodium hydroxide

4. magnesium oxide

]]> 2021-05-28 07:02:33 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567804687 Joanne https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567804958 K : elementL : compoundM and N : mixtureO : Either element or compound ]]> 2021-05-28 07:02:45 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567804958 Li Yi https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567805339 The melting and boiling point for elements in Group I is decreasing down the group.
The melting and boiling point for elements in Group VII is increasing down the group.]]> 2021-05-28 07:03:00 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567805339 Zhu Haoming https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567806047 (A)
Sulfuric acid/sodium carbonate
Sodium carbonate
Magnesium carbonate
Co(so4)

(B)CuO+H2SO4——————-CuSO4+H2O

(C)Heat the filtrate to saturate it
Cool the filtrate
Filter to obtain the salt crystals
Wash with a little distilled water to remove impurities
Dry the crystals between filter paper

]]> 2021-05-28 07:03:30 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567806047 YuanBo https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567806539 a)(l)In the group one ,the melting point and the boiling point are decrease down and the group seven boiling point and melting point are increase down]]> 2021-05-28 07:03:53 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1567806539 Lei Yueer https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573051482 (A)(I)It irritates the eyes and lungs, cause breathing difficulties and inflammation of the lungs
(II)The reduces the ability of blood cells to transport oxygen to the rest of the body.
(B)CO+2NO=CO2+N2
(II)nitrogen is reduced as it loses oxygen to turn from NO to N2.]]> 2021-05-31 07:28:22 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573051482 Lei Yueer https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573057702 F:iron (II)sulfate
G:barium sulfate
H:iron(II)hydroxide
J:iron (III)sulfate
K:iron (III)hydroxide ]]> 2021-05-31 07:31:50 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573057702 (c) heat till saturation. muikiamphua1 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573059164 leave to cool, crystals form
filter to get the crystals
wash, dry

(d) silver chloride
barium sulfate

]]> 2021-05-31 07:32:32 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573059164 Lei Yueer https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573060790 Bitumen
Calcium carbonate
Hydrogen ]]> 2021-05-31 07:33:26 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573060790 Genqiang https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573063540 A
i: They cause breathing difficulties on human.
ii: It causes brain damage and die of cell tissues due to lack of oxygen.
B
i: 2CO+2NO--->2CO2+N2
ii: substance reduced CO is NO, as it loses oxygen elements in NO to N2.

]]> 2021-05-31 07:34:53 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573063540 muikiamphua1 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573066966 (a) ]]> 2021-05-31 07:36:39 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573066966 Joanne https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573075610
A)
1) sulfuric acid and potassium hydroxide
2) sodium hydroxide
3) magnesium hydroxide
4) CuSO4
B) CuO + H2SO& - - - > CuSO4+H2O

D) silver chloride and lead chloride ]]> 2021-05-31 07:41:21 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573075610 Leo 825255529 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573078778 1.2 2 1 1
2.NO ]]> 2021-05-31 07:43:01 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573078778 yiqing https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573081119 5b）NO lose oxygen to form N2]]> 2021-05-31 07:44:24 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573081119 Joanne https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573083573 A)
I) breathing difficulties
Ii) combines with haemoglobin in the blood, preventing absorption of oxygen and resulting in asphyxiation
B)
I) 1 2 1 1
Ii)N of NO
Because it lost oxygen.

]]> 2021-05-31 07:45:45 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573083573 MANHEI https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573086521 preparation]]> 2021-05-31 07:47:28 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573086521 weifeng https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573087497 It is harmful to the lungs and throat and bad for human health
it combines with the blood more closely and humans will have breathing problems]]> 2021-05-31 07:48:02 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573087497 Zaneeeee https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573087954 Prevent contact into both Oxygen and water ]]> 2021-05-31 07:48:17 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573087954 Genqiang https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573088436 i: Paint is to prevent the air and water from the surface of iron and the rusting with it.
ii: experiments requires quantitative tests in pure chem
iii: two repeating units ]]> 2021-05-31 07:48:35 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573088436 Leo 825255529 https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573088968 The harmful substances in air

]]> 2021-05-31 07:48:52 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573088968 Precipitation https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573089826 crystallization
Tiltration ]]> 2021-05-31 07:49:21 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573089826 Joanne https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573090767 1)Salt preparation technique
2)How to identify and explain reduction
3)Harmful gas and negative health effects to humans ]]> 2021-05-31 07:49:54 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573090767 yiqing https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573091175 Nitrogen lose oxygen to form Ｎ2

]]> 2021-05-31 07:50:09 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573091175 Lei Yueer https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573091865 1.how to accurately determine the degree of rusting of iron in experimental design
2.always state the accurate amount of reactants in experimental design
3.haematite is not an alloy,alloy is a mixture while iron oxide is a compound ]]> 2021-05-31 07:50:33 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573091865 the component of cruel oil https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573093860 2021-05-31 07:51:43 UTC https://padlet.com/muikiamphua1/f7ig7nkqu5h5rxxp/wish/1573093860