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 2PbO + 4NO2 + O2
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 2PbO + 4NO2 + O2