Practical Chemistry by Subhoshree Chatterjee https://padlet.com/subhoshree15/P29C Part-2 en-us 2021-01-19 03:22:28 UTC 2021-01-20 06:41:38 UTC hello@padlet.com Nitayanta https://padlet.com/subhoshree15/P29C/wish/1099528113 The residue(Dry CuSO4) will decompose into Copper oxide(CuO black solid) and Sulfur trioxide(SO3 white fumes) when strongly heated and the water molecules will convert to water vapour.]]> 2021-01-19 03:46:14 UTC https://padlet.com/subhoshree15/P29C/wish/1099528113 Observation- Arash arashsyed20 https://padlet.com/subhoshree15/P29C/wish/1099528664 1. white crystalline solid Na2CO3 on strong heating swells crumbles and then melts, giving steam vapours.(water vapour)

2.this steamy vapour condenses on cooler parts of the test tube to form droplets of a colourless liquid

3.Colourless liquid:
a)when added to white anhydrous copper sulphate turns it blue
b)turns blue cobalt chloride paper pink

4. On cooling a white amorphous residue is left (sodium carbonate)

5. It is an endothermic reaction]]> 2021-01-19 03:46:42 UTC https://padlet.com/subhoshree15/P29C/wish/1099528664 Vaidehi https://padlet.com/subhoshree15/P29C/wish/1099529164 Copper Carbonate (CuCO3) is a light green powder.
Copper Oxide (CuO) is Black,
This reaction is heated.
Carbon Dioxide is released it is colourless, odourless, and extinguishes burning wooden splinter. It(CO2) turns Lime water milky, and has no effect on acidified K2Cr2O7 or KMnO4, and is acidic in nature.]]> 2021-01-19 03:47:06 UTC https://padlet.com/subhoshree15/P29C/wish/1099529164 Bhumi https://padlet.com/subhoshree15/P29C/wish/1099529348 Reactants
Zinc Carbonate(ZnCO3) is the white powdered gas which is being heated to give Zinc Oxide(ZnO) and Carbon Dioxide(CO2).
Products
  • Residue produced is Zinc Oxide(ZnO), which is white when cold and yellow 
  • Gas evolved is a colourless, odourless and acidic gas namely Carbon Dioxide(CO2).
Observation
1. ZnCO3, is the light amorphous white solid which gives out ZnO which is a pale yellow gas.
2. It also produces a colourless, odorless and acidic gas, CO2 that turns lime water milky.
3. The residue, ZnO on cooling changes to white colour
]]> 2021-01-19 03:47:17 UTC https://padlet.com/subhoshree15/P29C/wish/1099529348 shivansh shivansh2404 https://padlet.com/subhoshree15/P29C/wish/1099530028 zinc nitrate [Zn(NO3)2] ,an acidic compound ,on heating decomposes to give zinc oxide [ZnO]+ nitrogen dioxide [NO2]+ and oxygen [O2]
 Observations:
zinc nitrate which is a colourless ,odourless  crystalline  
when heated gives zinc oxide nitrogen dioxide and oxygen .

]]> 2021-01-19 03:47:51 UTC https://padlet.com/subhoshree15/P29C/wish/1099530028 Q3. Arash arashsyed20 https://padlet.com/subhoshree15/P29C/wish/1099558187 a.H2S -Hydrogen sulphide , turns lead acetate paper black
b. dilute HCL or H2SO4 , Metallic sulphides (ZnS,FeS)]]> 2021-01-19 04:10:04 UTC https://padlet.com/subhoshree15/P29C/wish/1099558187 Nitayanta https://padlet.com/subhoshree15/P29C/wish/1099558274 Q1. 
a.
1) Sulphur dioxide
2) It turns the liquid from orange to green.
b.
2) NH3(Ammonia)
1) The substance is acidic

c.
1) HCl
2) NH4Cl
3) Combination reaction.

d.
1) It forms an acidic solution with the water in the moist litmus.
2) Chlorine.

]]> 2021-01-19 04:10:07 UTC https://padlet.com/subhoshree15/P29C/wish/1099558274 shivansh shivansh2404 https://padlet.com/subhoshree15/P29C/wish/1099563811 Q2 1) nitrogen dioxide (NO2)
2) carbon dioxide (CO2)
3) oxygen (O2)]]> 2021-01-19 04:14:05 UTC https://padlet.com/subhoshree15/P29C/wish/1099563811 Q4 https://padlet.com/subhoshree15/P29C/wish/1099567676 i) the nature of gas in set-up A is basic in nature because it turns moist litmus paper blue.
the nature of gas in set-up B iis acidic in nature because it turns moist litmus paper red.
ii) The deposit X is NH4Cl
iii) The gas is Carbon Dioxide and it is acidic in nature because it turns lime water milky, and it is a non-combustible gas as it extinguishes a glowing splinter.
iv) If a pungent smell is released then it is sulfur dioxide being produced but is thee is no odor and it turns lime water milky it is Carbon Dioxide because CO2 is an odorless gas.
v) The residue in the set-up is copper-sulfate crystals because it is blue in colour and changes to white when it is heated which proves that it is (CuSO4∙5H2O).
vi) ]]> 2021-01-19 04:16:37 UTC https://padlet.com/subhoshree15/P29C/wish/1099567676