Q18 of 152 Page 19

Giving examples, state the difference between balanced and unbalanced chemical equations.

In a balanced reaction no of moles of any element is equal on both side of a chemical equation where as in an unbalanced reaction no moles are not equal.

Balanced reaction:


2Mg + 02 2Mg0


Unbalanced Reaction:


C + C02 CO



More from this chapter

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17 Give two characteristics of the chemical reaction which occurs on adding potassium iodide solution to lead nitrate solution. 18 What is a chemical equation? Explain with the help of an example. 18 Balance the following chemical equations:

(i) NH3 N2 + H2


(ii) C + C02 CO

 19 When hydrogen is passed over copper oxide, copper and steam are formed. Write a balanced equation for this reaction and state which of the chemicals are:

(i) elements


(ii) compounds


(iii) reactants


(iv) products


(v) metals


(vi) non-metals