define chemical reaction and state for observation 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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Answer:
Process in which new substances with new properties are formed by the rearrangement of atoms is known as a chemical reaction. (i) Evolution of gas: The chemical reaction between zinc and dilute H2SO4. Zn(s)+H2SO4(aq) → ZnSO4(sq) +H2(g)↑ (ii) Change in colour: The chemical reaction between potassium iodide solution and lead nitrate solution. Pb(NO3)2(aq)+2KI → 2KNO3(aq)+PbI2(s) Pb(NO3)2(aq)+2KI - Colourless PbI2(s)-Yellow (iii) Formation of piecipitate : The chemical reaction between sulphuric acid barium chloride solution. BaCl2(aq) + H2SO4(aq) → 2HCl(aq) + BaSO4(s) 2HCl(aq) + BaSO4(s)- White precipitate (iv) Change in temperature : The ctremiial reaction between quick lime and water. CaO(s)+H2O(l) → Ca(OH)2(aq)+HeatRead more on Sarthaks.com - https://www.sarthaks.com/84183/define-chemical-reaction-state-observations-which-determine-chemical-reaction-taken-place
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Answer:
Explanation:
Process in which new substances with new properties are formed by the rearrangement of atoms is known as a chemical reaction. (i) Evolution of gas: The chemical reaction between zinc and dilute H2SO4. Zn(s)+H2SO4(aq) → ZnSO4(sq) +H2(g)↑ (ii) Change in colour: The chemical reaction between potassium iodide solution and lead nitrate solution. Pb(NO3)2(aq)+2KI → 2KNO3(aq)+PbI2(s) Pb(NO3)2(aq)+2KI - Colourless PbI2(s)-Yellow (iii) Formation of piecipitate : The chemical reaction between sulphuric acid barium chloride solution. BaCl2(aq) + H2SO4(aq) → 2HCl(aq) + BaSO4(s) 2HCl(aq) + BaSO4(s)- White precipitate (iv) Change in temperature : The ctremiial reaction between quick lime and water. CaO(s)+H2O(l) → Ca(OH)2(aq)+HeatRead more on Sarthaks.com - https://www.sarthaks.com/84183/define-chemical-reaction-state-observations-which-determine-chemical-reaction-taken-place