Which of the following represents a phase change? a. melting b. crushing c. expanding d. burning

Melting.

Explanation:

Phase change is when a state of a matter changes to another.

For example

a) conversion of solid to liquid : It is a phase change known as melting.

b) conversion of liquid to solid: it is a phase change known as freezing.

c) conversion of solid to gas : It is a phase change known as sublimation.

d) conversion of gas to solid: it is a phase change known as solidification.

e) conversion of liquid to gas : It is a phase change known as vaporization.

f) conversion of gas to liquid: it is a phase change known as liquefaction.

The other options are not phase change

crushing: it simply conversion of a large particles of solid to smaller

expanding: it is again conversion of a gas to higher volume gas

burning: it is a chemical change where a substance undergoes burning.

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