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Matter and energy.
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When a reaction is gradual,
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The change in energy is slight.
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I mean, you don't even notice the reaction is happening.
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For example,
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When rust collects on the underside of a car.
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But if a reaction happens quickly,
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Otherwise harmless substances can interact in a way
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That generates enormous bursts of energy.
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Who can give me an example
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of rapid chemical reaction?
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Hint, Hint. Right here.