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30 April, 13:34

Fireworks are chemical reactions that release energy. Which of these phenomena are caused by chemical reactions that release energy? If you're not sure, make a guess. Muscles work to perform a task. Fuel burns and heats the surroundings. A battery supplies current to a device. A car's air bag expands by igniting a chemical.

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  1. 30 April, 14:57
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    I think it is either the second or third one.
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