X-D Chem ch1 notes by Tosh_ Vids https://padlet.com/vtoshad/Xd2021to2022chemCh1 Made by the X-D Bashers en-us 2021-04-15 07:45:10 UTC 2023-03-14 04:34:00 UTC hello@padlet.com https://padlet.net/icons/png/1f9ea.png WHAT IS CHEMICAL EQUATION https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1424063003 A chemical equation  is the symbolic representation of a chemical reaction in the form of symbols and formulae, wherein the reactant entities are given on the left-hand side and the product entities on the right-hand side.
EG OF CHEMICAL EQUATION ->
Zink + sulphuric acid -> zink sulphate + hydrogen
Zn + H₂SO₄ -> ZnSO₄ + H2

BHAVIESH  '6']]> 2021-04-16 04:11:42 UTC https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1424063003 Figure 1.7 https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1424135131 Silver chloride turns grey 
In sunlight to form silver 
Metal 

]]> 2021-04-16 04:56:27 UTC https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1424135131 Figure 1.8 https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1424160016 (a) Iron nails dipped in copper sulphate solution]]> 2021-04-16 05:10:08 UTC https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1424160016 Figure 1.8 https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1424171707 (b)Iron nails and copper sulphate solutions compared before and after the experiment]]> 2021-04-16 05:16:37 UTC https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1424171707 Equation of photosynthesis https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1424324317 NAME - KULDIP 




The balanced reaction for photosynthesis in word form is


bon dioxide + Water → Glucose  + oxygen.


 balanced reaction for photosynthesis in symbol form is

2 + 6H2O  → C6H12O6 + 6O2 + 6H2O


THE SKELETAL
Skeletal chemical equation is a representation of a chemical reaction using chemical formulae of reactants and products. In skeletal chemical equation the mass no of elements in reactant side is not equal to the mass no of elements in product side. Later it has to be balanced by appropriate number of molecules.

For example: Mg + O2 → MgO, it’s a skeleton equation.

Balanced Equation : 2Mg(s) + O2(g) → 2MgO(s).


WORD EQUATION
Word equation means we have to write the chemical reaction in the form of words. Chemical reaction means we have to mention the chemical symbols of the elements to represent the reaction. Nail contains iron in it.
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KULDIP 10 D 
]]> 2021-04-16 06:39:42 UTC https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1424324317 What happens to a magnesium ribbon when it burns in air Figure 1.1 Aayush_Kashyap https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1424740984 Observation: When magnesium is placed in a Bunsen burner flame in air it burns with a white flame. The product is a 2Mg+O2=2MgO.
Explanation: At high temperatures the magnesium atoms in the metal combine with the oxygen atoms in the air. A chemical reaction produces magnesium oxide.
Name - Aayush Kashyap IX D
Roll no. - 1

]]> 2021-04-16 09:57:34 UTC https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1424740984 Displacement Reaction pandesiddhi30 https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1428292270 A type of reaction in which reactive elements displaces less reactive element from it's compound or salt  solution is known as Displacement reaction .
 A + BC → AC + B
 
Example =
 Na + Al2Cl2 ------> NaCl + Al

This means Na is more  reactive  then Al .

Roll no - 23]]> 2021-04-17 14:36:27 UTC https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1428292270 fig 1.3 https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1429330090 we took a small amount of calcium oxide and added water to it in the beaker.we will observe that the beaker is heated.the temperature is increased. this is because when calcium oxide reacts with water to produce slaked lime(calcium hydroxide) releasing a large amount of heat.this is a combination reaction.

CaO=H2o---->Ca(OH)2+heat


FIG 1.4
we took 2g ferrous sulphate crystals in a dry boiling tube.the color is green.now we heat the boling tube over the flame of a burner or spirit lamp.the color has changed from green.we can also smell the odour of burning sulphur.this reaction is thermal decomposition.

2FeSo4 ----> Fe2o3+So2+So3

 sakshi.v
20
10d


]]> 2021-04-18 07:17:19 UTC https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1429330090 Corrosion & Rancidity vtoshad https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1431159231                 CORROSION
Definition :- When a metal is attacked by substances around it, such as moisture, acids, etc, it is said to 'corrode'. This process is known as corrosion. For example :- The black coating on silver (Silver Sulphide)
[2Ag+SO₂ → Ag₂S + O₂]
and the green coating on copper (Copper Carbonate)
[ Cu + 2 Co₂ → CuCO₃ + CO]
are examples of corrosion other than the rusting of Iron.
Corrosion causes damage to car bodies, bridges, iron railling, etc..  A HUGE amount of money is sent every year, to replace the rusted iron. Therefore, Corrosion is a serious problem.]]> 2021-04-19 02:28:50 UTC https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1431159231 Corrosion & Rancidity vtoshad https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1431189649                  RANCIDITY
Definition :- When the substance containing oils and fats are exposed to air they get oxidised and become rancid due to which their smell, taste and colour change. This process is known as rancidity.
Usually substances which prevent oxidation (anti-oxidants) are added to foods contaning fats and oil.]]> 2021-04-19 02:41:07 UTC https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1431189649 Double Displacement Reaction swetasahni14 https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1433173854  Reactions in which ions are exchanged between the reactants forming a new compounds are called Double Displacement Reactions.
Example :-
Na2SO4 + BaCl2 → BaSO4 + 2NaCl
(sodium sulphate) + (barium chloride) → (barium sulphate) + (sodium chloride)

Precipitation
The reaction in which an insoluble substance (precipitate) is formed by the mixing of two solutions containing salts is called the Precipitation Reaction.
Example :-
Na2SO4 + BaCl2 → BaSO4 + 2NaCl

Name - Sweta Sahni
Roll no. - 24

]]> 2021-04-19 14:02:09 UTC https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1433173854 Name:- Divyanshi https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1437313333 Roll no. 27
Fig 1.1
This is the figure of burning of magnesium ribbon in air and collection of magnesium oxide in a watch-glass. 

Before performing this activity it is advised to wear eye protection.

Step 1. Clean a magnesium ribbon about 2cm long by rubbing it with sandpaper. 

Step 2. Hold it with a pair of tongs. Burn it using a spirit lamp or burner and collect ash so formed in a watch-glass as shown in the figure. Burn the magnesium ribbon keeping it as far as possible from your eyes. 

Step 3. When the magnesium metal burns it reacts with oxygen found in the air to form Magnesium Oxide. After it burns, it forms a white powder of the magnesium oxide 

]]> 2021-04-20 11:19:52 UTC https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1437313333 Name:- Divyanshi https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1437368273 Roll no. 27
Fig 1.2
This is the figure of formation of hydrogen gas by the action of dilute sulphuric acid on zinc. 

Step 1. Take a few zinc granules in a conical flask or a test tube.

Step 2. Add dilute hydrochloric acid or sulphuric acid.

 The gas produced in the reaction is hydrogen. Zinc reacts with dilute sulphuric acid to produce hydrogen gas and zinc sulphate.

]]> 2021-04-20 11:41:08 UTC https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1437368273 What is Precipitation Reaction ??🤨 https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1450525061 The term ‘precipitation reaction’ can be defined as “a chemical reaction occurring in an aqueous solution where two ionic bonds combine, resulting in the formation of an insoluble salt”. These insoluble salts formed in precipitation reactions are called precipitates. Precipitation reactions are usually double displacement reactions involving the production of a solid form residue called the precipitate. These reactions also occur when two or more solutions with different salts are combined, resulting in the formation of insoluble salts that precipitate out of the solution.

Example of reactions :
1. AgNO₃(aqueous) + KCl(aqueous) —–AgCl(precipitate) + KNO₃(aqueous)
2. 2KOH(aqueous) + CaCl₂(aqueous)—-Ca(OH)₂(aqueous) + 2KCl(aqueous)
3. AgNO₃(aqueous) + NaCl(aqueous) —- AgCl↓ + NaNO3 (aqueous)

Here a Video to Understand Better ✌️
NAVJEET SINGH XD 


]]> 2021-04-23 05:25:17 UTC https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1450525061 Reactive Series And The Easy Way To Learn It navisingh666111 https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1450553991 Please - Potassium
Stop - Sodium
Calling - Calcium
Me - Magnesium
A - Aluminium
Cute - Carbon
Zebra - Zinc
I - Iron
Like - Lead
Her - Hydrogen
Calling - Copper
Me - Mercury
Smart - Silver
Perfect - Platinium
Guy - Gold
 
You Can Learn From This Picture Too. Its Quite Similar To The Written One.


 

]]> 2021-04-23 05:42:00 UTC https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1450553991 How to determine if a Chemical reaction has taken place? 11881anushka https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1457623897 There are five signs of a chemical change:
  1. Color Change.
  2. Production of an odor.
  3. Change of Temperature.
  4. Evolution of a gas (formation of bubbles)
  5. Precipitate (formation of a solid)
  6. EXAMPLES :-
]]> 2021-04-26 02:55:31 UTC https://padlet.com/vtoshad/Xd2021to2022chemCh1/wish/1457623897