# 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 $\stackrel{Heat}{\to }$ 2PbO + 4NO2 + O2

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