Multiple Choice
In an endothermic reaction, which of the following statements is correct?
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8. Thermochemistry
Endothermic & Exothermic Reactions
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In an endothermic reaction, where does the energy required for the reaction come from?
A
It is produced by the products.
B
It is generated internally within the system.
C
It is released by the reactants.
D
It is absorbed from the surroundings.
Verified step by step guidance1
Understand that an endothermic reaction is a chemical reaction that absorbs energy from its surroundings, usually in the form of heat.
Recall that energy cannot be created or destroyed, so the energy required for the reaction must come from an external source.
Recognize that in an endothermic process, the reactants absorb energy to break bonds and form products, meaning the system takes in energy rather than releasing it.
Therefore, the energy required for the reaction is absorbed from the surroundings, which causes the surroundings to lose heat and often feel cooler.
Conclude that the correct explanation is that the energy needed for an endothermic reaction comes from the surroundings, not from the reactants or products themselves.
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