Answered

What are some signs that a chemical change takes place when a firework explodes?Matter is destroyedLight is producedHeat is producedThe chemical composition is not changed

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Answer;

Light is produced and heat is produced

Explanations

Chemical changes occurs when substances react to form new products. This reaction can be in form of a decomposition reaction.

During fireworks explosion, there is a reaction between charge of gunpowder which is been ignited with a fuse to produce a spark that leads to explosion.

The explosion leads to production of light and heat. Hence we can conclude that some signs that a chemical change takes place when a firework explodes is light is produced and heat is produced