Question

Using a suitable chemical equation justify that some chemical reactions are determined by (1) change in colour (2) change in temperature.

Answer 1

1) Change in colour

Fe + CuSO4 ------> FeSO4 + Cu.

Here the colour of copper sulphate changes from blue to colourless.


2) Change in temperature

CuO + H2O -------> Cu(OH)2

Here heat is liberated.



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Answer 2

Answer:

During a chemical reaction when there is a colour change it confirms that a chemical reaction has taken place  

Example CuSO4 + Fe → FeSO4 + Cu  

(Blue) (Green)  

When there is change in the temperature during a chemical reaction they are known as endothermic and exothermic reactions.

Example for Change in temperature chemical reaction  

Methane (natural gas) + oxygen ==> carbon dioxide + water (+ heat energy) CH4 + 2O2 ==> CO2 + 2H2O.