Question

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which reaction is exothermic? a reaction that requires an activation energy a reaction that absorbs energy from the environment a reaction that does not involve a change in energy a reaction that releases energy into the environment

Explanation:

An exothermic reaction is defined as a chemical reaction that releases energy (such as heat, light, etc.) into the surroundings. Let's analyze each option:

• "a reaction that requires an activation energy": All chemical reactions require activation energy, this is not specific to exothermic reactions.
• "a reaction that absorbs energy from the environment": This describes an endothermic reaction, not exothermic.
• "a reaction that does not involve a change in energy": No chemical reaction occurs without an energy change, so this is incorrect.
• "a reaction that releases energy into the environment": This matches the definition of an exothermic reaction.

Answer:

a reaction that releases energy into the environment