Question

Mention any three changes that can be brought about by heating. Explain how these changes can be done?

Answer 1

1.Physical state of a substance can be changed y heating.
2.Heating can also cause exapansion.Molecules will gain energy from heating and move apart.so their intermolecular distance will increase and hence expansion will take place.
3.In biological prospective ,if heating is done under specific conditions it can cause sterilization and pasteurization.

Answer 2

Expansion, Contraction, Remains unchanged. Expansion :materials like iron, steel expand on heating due to molecular expansion. And some materials like type metal contracts on heating. Rubber bands are unusual because they are made from loosely-packed chains of atoms