Question

Select the correct answer from the choices A, B, C, and D which are given. Write only the letter corresponding to the correct answer.

Which is an example of chemical change?

• A. Water freezes
• B. Wood is cut
• C. Bread is baked
• D. Wire is bent

Answer 1

The correct option is C

Bread is baked

Explanation for correct option:

Option C

Chemical change:

• A chemical change is a permanent change in which new substances are formed.
• The chemical change is permanent and cannot be reversed by a simple physical method.
• A chemical change involves an exchange of energy in the form of heat or light.
• For example, rusting of iron, burning of wood, respiration, etc.
• When the bread is baked, a new substance is formed.
• In bread making, carbon dioxide expel out.
• As the dough rises and proves, carbon dioxide is formed, this is why the dough volume increases.

Therefore, option C is correct.

Explanation for incorrect options:

Physical change:

• A physical change is a change in which no new substance is formed.
• A physical change is temporary and reversible.
• In physical change the chemical composition of the original substance is not altered.
• When water freezes, wood is cut, and wire is bent, then no new substance forms.

Therefore, options A, B, and D are incorrect.