How is explosion of fireworks a chemical change?

Answer 1

Explosions could be caused by a chemical reaction, or they could have a mechanical cause. It could even be nuclear. If a stick of TNT goes off, it's chemical, while a compressed gas cylinder with a failing weld that explodes while being filled is mechanical. A nuclear weapon is driven by nuclear reactions. All involve a rapid and violent release of energy. The thing that makes an explosion is the speed of the activity, whether it be chemical or mechanical. A high explosive anti-tank round is a chemical weapon, while a ballistic "spear" (perhaps made with depleated uranium) used to defeat modern armor is a mechanical weapon.

Answer 2

The explosion of fireworks involves a chemical change because the chemical compounds in the fireworks undergo a reaction that produces light, heat, and sound. The ignition of the fireworks triggers a series of chemical reactions that release energy in the form of light and sound, transforming the original chemical compounds into new substances.

Answer 3

A chemical reaction produces a biproduct.

Answer 4

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