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Which observation shows that a chemical reaction is exothermic?

Answer and explanation

Correct answer: The container becomes hot

In an exothermic reaction, heat is released from the reacting system to the surroundings. Therefore, the temperature of the reaction container may rise and it feels hot. In contrast, a container becoming cold can indicate an endothermic reaction, in which heat is absorbed from the surroundings.

Related tags

ScienceClass 10Chemical ReactionsExothermic ReactionsHeat TransferTemperature Change

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