Question

2) Write the chemical equation of the reaction in which the following changes have taken place with an example of each: (a) Change in colour (b) Change in temperature​

Answer 1

Answer:

Explanation:Fe + CuSO4 -----> FeSO4 + Cu

in this reaction when iron reacts with copper sulphate, copper sulphate is blue in colour change into green in colour called iron sulphate as a result of displacement reaction.

CaO + H2O-------> Ca(OH)2 + heat

in this reaction when calcium oxide reacts with water to increase the temperature and forms a Calcium Hydroxide. it is due to exothermic reaction.

BaCl2 + Na2SO4 ----> 2NaCl + BaSO4

when Barium Chloride reacts with sodium sulphate it forms Barium sulphate as a precipitate. it is due to precipitation reaction