1. Two methods by which rusting of iron can be prevented are painting and galvanisation.

2. Changes in which new substances are formed are called  airburning of crackerschemicalchemical changecrystallinemoistureoriginalphysicalwater vapor changes.

3. Changing of water into  airburning of crackerschemicalchemical changecrystallinemoistureoriginalphysicalwater vapor is called physical change.

4.Burning of the vapors of wax to give CO2, heat and light is  airburning of crackerschemicalchemical changecrystallinemoistureoriginalphysicalwater vapor change.

5. A change is said to be chemical if we cannot get back the substance in  airburning of crackerschemicalchemical changecrystallinemoistureoriginalphysicalwater vapor state.

6. Cooking of food is a  airburning of crackerschemicalchemical changecrystallinemoistureoriginalphysicalwater vapor.

7. The essential conditions for rusting are presence of  airburning of crackerschemicalchemical changecrystallinemoistureoriginalphysicalwater vapor and  airburning of crackerschemicalchemical changecrystallinemoistureoriginalphysicalwater vapor.

8. Those substances which are hard and possess definite geometrical shape are known as  airburning of crackerschemicalchemical changecrystallinemoistureoriginalphysicalwater vapor substances.

9. Crystallisation is a  airburning of crackerschemicalchemical changecrystallinemoistureoriginalphysicalwater vapor change.

10. An example of chemical reaction where sound is produced is  airburning of crackerschemicalchemical changecrystallinemoistureoriginalphysicalwater vapor.