Which of the following represents a chemical change?

bending a wire
freezing of water
fireworks exploding
melting of a wax candle

That Answer would be...

C. Fireworks exploding

because this is a chemicals change the creates the fireworks.

Option (c) is the correct answer.

Explanation:

A change that does not bring any difference in chemical composition of a substance are known as physical properties.

For example, shape, size, mass, volume, density, etc of a substance are all physical change.

And, a change in which there occurs a difference in chemical composition of a substance then it is known as chemical change.

For example, precipitation, reactivity, toxicity etc are chemical change.

Fireworks exploding is a chemical change.

Thus, we can conclude that out of the given options fireworks exploding represents a chemical change.