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Like baking a cake once you heat it, it becomes a new substance. With a chemical change you can never go back to what you had before. Also like a car rusting, a match being lite, and burning wood ( the new substance for wood is ash)

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11y ago
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12y ago

whenever a reaction takes place it either consumes energy or release energy in form of heat or light. All Exothermic reactions release energy in form of heat.

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13y ago

Reactions that require energy in the form of heat are called endothermic.

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14y ago

endothermic, (so it absorbs heat instead of giving it off. Think of endo as inside of and exo outside because exothermic gives off heat making the two opposites:))

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14y ago

It is called an exothermic reaction.

Example:

2 Na + 2 H20 ---> 2 NaOH + H2

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13y ago

chemical reaction energy requires energy in the form of heat.

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13y ago

Endothermic Reaction

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15y ago

an endothermic reaction

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Q: What kind of reaction energy that requires energy in the form of heat?
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