when water is heated , it changes it's States from liquid to gas . has any chemical reaction taken place during the change?
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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.
(iv) Thermal decomposition of mercury oxide - The colour of mercury changes from red to silvery, that is metallic.
Explanation:
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