Question

In most of the substances, melting causes _ _ _ _ _ _ _ and freezing causes _ _ _ _ _ _.
A. Contraction, expansion
B. Expansion, contraction
C. Contraction, melting
D. None of above

Answer 1

Hint: For solving this question, we need to understand the concepts of change in state of matter. As we know that, freezing is the change that occurs when a liquid transforms into a solid state when the temperature decreases. And melting is just the opposite of freezing. It refers to the change from a solid to a liquid with an increase in the temperature.

Complete step by step answer:
In case of substances, like ice we know that when ice is put under the condition of melting i.e. when the temperature increases then that substance starts melting. It means that ice expands and water is left in this reaction.
Then, when we freeze this water with an increase in temperature. The water changes its form and contracts to form the shape of an ice cube.
So, we can conclude that substances expand with an increase in their size when the substance gets warmer. Whereas, it contracts with a decrease in size when the substance gets cooler.

In most of the substances, melting causes expansion and freezing causes contraction.

So, the correct answer is Option B.

Note:
We need to note the related terms. We know freezing is an exothermic reaction it means that when a liquid substance changes into solid some amount of heat and pressure is released. This happens due to the temperature of the material not rising during freezing. This process is known as solidification. Whereas the change from solid state to vapor state without passing through the liquid state is called sublimation.