EVERYDAY SCIENCE

Detailed explanation-1: –As from the discussion we can consider that a physical change involves only change in physical state whereas a chemical change results in the formation of new substances. Boiling of water, melting of ice and dissolution of salt are physical changes as no new products are formed. So, the correct answer is “Option D”.

Detailed explanation-2: -Freezing and boiling are considered to be examples of chemical reactions. This depends on their conception of substance. If students regard ice as a different substance from liquid water they are likely to classify the melting of ice as a chemical change.

Detailed explanation-3: -Complete answer: Boiling of water is not a chemical change it is a physical change. Physical changes lead to changes in the appearance of the substances.

Detailed explanation-4: -Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color change, formation of a precipitate, formation of a gas, odor change, temperature change.

Detailed explanation-5: -Boiling is a physical change and molecules are not chemically altered during the process.