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If the reaction vessel becomes very cold during a chemical reaction, what is the correct conclusion about the energy change?

Answer and explanation

Correct answer: The reaction has absorbed heat from the surroundings.

A cold reaction vessel indicates that the reaction is absorbing heat from the vessel and the surrounding environment. Such a reaction is endothermic, so option A is correct. Option B represents an exothermic reaction, in which heat is released to the surroundings and the vessel or surroundings generally become warmer.

Related tags

Chemical ReactionsEndothermic ReactionEnergy ChangeHeat AbsorptionChemical Equations

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