Question

what happened when lead nitrate is heated. write chemical equation only

Answer 1

lead and nitrate become separate by decomposition

Answer 2

 when lead nitrate is heated the reaction is as follows

2Pb(NO3)2 (s)  + heat -------> 2PbO (s) + 4NO2(g) + O2 (g)

here Pb(NO3)2 is lead nitrate.

PbO is lead oxide

NO2 is nitrogen dioxide 

and this is a decomposition reaction as lead nitrate splits up ito three elements when heat is supplied.

Hope it will help you