Q33 of 152 Page 20

What is meant by a chemical reaction? Explain with the help of an example.

Chemical reaction are defined as processes in which new substance are formed with new properties.

For example: When carbon is burned in rich oxygen environment carbon dioxide and ash is formed.



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31 Translate the following statement into chemical equation and then balance it :

Barium chloride solution reacts with aluminium sulphate solution to form a precipitate of barium sulphate and aluminium chloride solution.

 32 When potassium nitrate is heated, it decomposes into potassium nitrite and oxygen. Write a balanced equation for this reaction and add the state symbols of the reactants and products. 33 Give one example each of a chemical reaction characterised by:

(i) evolution of a gas


(ii) change in colour


(iii) formation of a precipitate


(iv) change in temperature


(v) change in state.

 34 State the various characteristics of chemical reactions.