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Define a chemical reaction . State four ...

Define a chemical reaction . State four observations which help us to determine that a chemical reaction has taken place. Write one example of each observation with a balanced chemical equation.

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Process in which new substances with new properties are formed by the rearrangement of atoms is known as chemical reaction.
(i) Evolution of gas : The chemical reaction between zinc and dilute `H_(2)SO_(4)`
`Zn(S)+H_(2)SO_(4) (aq) rarr ZnSO_(4)(aq)+H_(2)(g)`
(ii) Change in colour : the chemical reaction between potassium iodide solution and lead nitrate solution.
` underset (("Colourless"))(Pb(NO_(3))_(2)(aq))+2Klrarr2KNO_(3)(aq)+ underset (("Yellow"))(PbI_(2)(s))`
(iii) Formation of precipitate : The chemical reaction between sulphuric and barium chloride solution.
`BaCl_(2)(aq)+H_(2)SO_(4)(aq)rarr2HCl(aq)+underset(("White precipitate"))(BaSO_(4)(S))`
(iv) Change in temperature : The chemical reaction between quick lime and water .
`underset (("Quicklime"))CaO(S)+H_(2)O(l)rarrCa(OH)_(2)(aq)+"Heat"`
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