1) Write the chemical reaction formed by above chemicals.
2) Identify the physical states of products and reactants.
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1) 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
2). The reactants are generally aqueous, unless insoluble (check solubility chart). One of the products will be a GAS, liquid or precipitate (solid).
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