Q20 of 152 Page 19

(b) Write balanced chemical equation from the following information:

An aqueous calcium hydroxide solution (lime water) reacts with carbon dioxide gas to produce a solid calcium carbonate precipitate and water.

Ca(OH)2 (aq) + C02 (g) CaC03 (s) + H20 (l)

This reaction is balanced as same amount of elements and compound is on either side.



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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

 20 What are the various ways in which a chemical equation can be made more informative? Give examples to illustrate your answer. 21 What is a balanced chemical equation? Why should chemical equations be balanced? 21 Aluminium burns in chlorine to form aluminium chloride (AlCl3). Write a balanced chemical equation for this reaction.