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Which best explains why a firework being ignited is an example of an exothermic reaction and not an endothermic reaction?
The fireworks produce colors.
The fireworks give off heat.
Igniting the fireworks requires energy.
Igniting the fireworks makes an odor.
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"The fireworks give off heat."
Reason: exothermic reactions release energy to the surroundings (usually as heat and light). Requiring energy to start the reaction is just activation energy and doesn't mean the overall reaction is endothermic.
Reason: exothermic reactions release energy to the surroundings (usually as heat and light). Requiring energy to start the reaction is just activation energy and doesn't mean the overall reaction is endothermic.
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