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What is a balanced chemical equation? Why should chemical equations be balanced?

Equal number of atom of different element are present in a balanced chemical equation. A chemical is balanced to obey the law of conservation of chemical reaction meaning equal masses of various elements in reactants and products.

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20 What are the various ways in which a chemical equation can be made more informative? Give examples to illustrate your answer. 20 (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.

 21 Aluminium burns in chlorine to form aluminium chloride (AlCl3). Write a balanced chemical equation for this reaction. 21 Potassium metal reacts with water to give potassium hydroxide and hydrogen gas. Write a ba lanced chemical equation for this reaction.