Q18 of 152 Page 19

What is a chemical equation? Explain with the help of an example.

Chemical reaction, a process in which one or more substances, (reactants), converts to one or more different substances (products). For example – Iron reacting with oxygen to form Iron(III) oxide.

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17 State two characteristics of the chemical reaction which takes place when dilute sulphuric acid is poured over zinc granules. 17 Give two characteristics of the chemical reaction which occurs on adding potassium iodide solution to lead nitrate solution. 18 Giving examples, state the difference between balanced and unbalanced chemical equations. 18 Balance the following chemical equations:

(i) NH3 N2 + H2


(ii) C + C02 CO