A student mixes citric acid and sodium hydrogen carbonate in water. The temperature of the mixture drops. Which conclusion is correct?

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Question

A student mixes citric acid and sodium hydrogen carbonate in water. The temperature of the mixture drops. Which conclusion is correct?

Accepted Answer

The reaction is endothermic and energy is taken in from the surroundings — A drop in temperature indicates energy is being absorbed from the surroundings, which is the definition of an endothermic reaction. Option A incorrectly labels the reaction as exothermic and states energy is released. Option C correctly identifies exothermic but wrongly says energy is taken in. Option D incorrectly states energy is released in an endothermic reaction.

Answer

The reaction is exothermic and energy is taken in from the surroundings

Answer

The reaction is exothermic and energy is released to the surroundings

Answer

The reaction is endothermic and energy is released to the surroundings

Answer

The reaction is endothermic and energy is taken in from the surroundings

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