Give an example of a physical and chemical change which occurs by the action of heat

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Solution

Physical change :
When ice is heated , it will melt into liquid. Hence , it is a physical change.

Chemical change :
When lead nitrate is heated , it will form lead oxide and brown coloured nitrogen dioxide gas.
2Pb(NO₃)₂ $\overset{H e a t}{\to}$ 2PbO + 4NO₂ + O₂

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Give an example of a physical and chemical change which occurs by the action of heat

Physical change : When ice is heated , it will melt into liquid. Hence , it is a physical change. Chemical change : When lead nitrate is heated , it will form lead oxide and brown coloured nitrogen dioxide gas. 2Pb(NO3)2 →Heat 2PbO + 4NO2 + O2

Physical change :
When ice is heated , it will melt into liquid. Hence , it is a physical change.

Chemical change :
When lead nitrate is heated , it will form lead oxide and brown coloured nitrogen dioxide gas.
2Pb(NO₃)₂ $\overset{H e a t}{\to}$ 2PbO + 4NO₂ + O₂