Question

givethree example of changes in which energy given out?

Answer 1

1- nuclear energy to electrical energy.(nuclear power plant)
2- electrical energy to sound energy.(television)
3- chemical energy to light energy(battery in torch)

Answer 2

They are as follows:

1) C(s) + O2(g)  ---> CO2(g) + heat
[ carbon burns in oxygen ( or in air) to form carbon dioxide and liberate a large amount of energy as heat ]

2) CH4(g) + 2O2 ---> CO2(g) + 2H2O(g) + heat
[ Methane burns in air to form carbon dioxide and water, and liberate a large amount of energy as heat ]

3) C2H5OH + 3O2 ---> 2CO2 + 3H2O + heat + light
[ alcohlos, such as ethanol burns to give energy as heat and light ].

hoped it helped u :))))))