Question

Chemical Reactions
1. State what is a chemical reaction. A chemical reaction is often accompan
indications or characteristics which include - al Colour change bl
or gas evolved c] Evolution or absorption of heat d] Formation of
With reference to each of the above indications, state the external indication
i] Addition of dilute acid to an active metal ii] Addition of dilute hydrochlor
nitrate ii] Addition of water to quicklime iv] Thermal decomposition of me




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Answer 1

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Required answer-:

A chemical reaction is a chemical change where substances react with each other to form a new substance.

(i) addition of dilute acid to an active metal - The test tube becomes hot and hydrogen gas is evolved, which means heat is produced.

(ii) Addition of dilute hydrochloric acid to silver nitrate - A white coloured precipitate is formed which is AgCl

(iii) Addition of water to quicklime - The solution boils and heat is produced accompanied by a hissing sound.

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Answer 2

Answer:

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