chemistry chemical reaction part 2
TRANSCRIPT
www.MishraHomeTution.com
www.mishrahometution.com
www.MishraHomeTution.com
Class 10 (C.B.S.E)
Chemical reaction and equation
Part-2
This educational video is brought to you by-
www.mishrahometution.com
www.MishraHomeTution.com
Topics covered
1.Characterstics of chemical reaction.
a. Evolution of gas..b. Formation of precipitate.c. Change in color.d. Change in temperature.e. Change in state
www.MishraHomeTution.com
1. Evolution of gas: In some chemical reactions charactersticproperty is evolution of gas.
e.g. when zinc react with dil. Sulphuric acid then hydrogen gas is evolved out.
Dil. Hydrochloric acid
Zinc granules
Hydrogen gas
www.MishraHomeTution.com
e.g. when sodium carbonate react with dil. Hydrochloric acid , then carbondioxide gas is evolved out.
Dil. Hydrochloric acid
Sodium carbonate
Carbon-di-oxide gas
www.MishraHomeTution.com
2. Formation of precipitate: In some chemical reactions an un soluble substance left out at the botom of the test tube, this unsoluble part is called precipitate.
eg. When potassium iodide is react with lead nitrate a yellow colour precipitate of lead iodide is formed.
www.MishraHomeTution.comwww.MishraHomeTution.com
Lead nitrate
Potassium iodide
Lead iodide(yellow precipiitate)
www.MishraHomeTution.com
3. Change in color: Some chemical reactions are characterised by
a change in color.
Eg. When citric acid react with purple colored potassium permanganate solution the color changes from purple to colorless.
www.MishraHomeTution.comwww.MishraHomeTution.com
Potassium permanganate(purple colored)
Citric acid(lemon juice0
www.MishraHomeTution.com
4. Change in temperature:- some chemical reactions characterised by change in temperature.
it consist 2 type of reactions:-a) Exothermic reactions .b) endothermic reactions.
In exothermic reaction heat produced after the reactions.The temperature of the product so formed increases.
eg: when water is added to quick lime , then slaked lime is formed with increase in temperature of the solution.
www.MishraHomeTution.comwww.MishraHomeTution.com
Hard glass beaker
Quick lime(Calcium oxide)
water
Temperature increases
www.MishraHomeTution.com
6. Change in state:- some chemical reactions characterised by change in state.
eg :the combustion of chemical reaction is characterised by a change in state.
www.MishraHomeTution.comwww.MishraHomeTution.com
Candle
Candle wax
www.MishraHomeTution.com
THANK YOU
For visiting this video
For more videos ,Home tutions,Online notes,Please contact:
www.mishrahometution.com