Question

Condensation of steam is not a chemical change.
a.) True
b.) false

Answer 1

Hint: To answer the given question it is important to understand the difference between physical and chemical changes and the fact that Physical changes do not affect the chemical composition of a substance.

Complete step by step answer:
First we should know about physical and chemical changes. Physical changes only affect or change the appearance of a substance. It does not affect the chemical composition of the substance. Whereas chemical changes cause a substance to change into an entirely new substance having a new chemical formula, this is why chemical changes are also known as chemical reactions.
Physical changes include bending or dissolving or freezing or boiling etc. the change of states is also a physical change. Chemical changes are also known as chemical reactions and we know that in chemical reaction reactants are transformed into products. The formation of gas bubbles is an example of chemical change, but the formation of gas bubbles during the process of boiling of water is not a chemical change.
After reading the above two paragraphs we can say that the condensation of steam is a physical change. In this process the water vapours present in steam transformed into a liquid, but there is no change in the composition of steam. The composition of steam will be the same in both liquid and vapours form.
Hence the correct option is true i.e. the condensation of steam is not a chemical change it is a physical change.

Note: The change of color and release of odor is a chemical change, as there are many reactions which involve a change in color which happens only when they undergo an oxidation or reduction reaction which is a chemical change.