Is fireworks called chemical reaction?
Yes, gunpowder reacts with oxygen.
The oxygen comes from oxidizers perchlorates, chlorates, nitrates, permanganates, chromates or oxides.
In propelling the rocket, potassium nitrate is used with black powder. Chlorates or perchlorates are used for the explosion as it reacts with carbon and sulfur rapidly. For the different colours of firework, various metal salts are used.
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