Multiple Choice
In an endothermic reaction, where does the activation energy required to initiate the reaction typically come from?
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8. Thermochemistry
Endothermic & Exothermic Reactions
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following best describes the process of freezing water, and how can you tell?
A
Freezing is an endothermic process because heat is released to the surroundings as water changes from liquid to solid.
B
Freezing is an endothermic process because heat is absorbed from the surroundings as water changes from liquid to solid.
C
Freezing is an exothermic process because heat is absorbed from the surroundings as water changes from liquid to solid.
D
Freezing is an exothermic process because heat is released to the surroundings as water changes from liquid to solid.
Verified step by step guidance1
Understand the definitions of endothermic and exothermic processes: Endothermic processes absorb heat from the surroundings, while exothermic processes release heat to the surroundings.
Identify the phase change involved: Freezing is the process where water changes from liquid to solid.
Recall that during freezing, water molecules lose energy to form a more ordered solid structure, which means energy is released.
Conclude that since energy is released to the surroundings during freezing, it is an exothermic process.
Therefore, the correct description is that freezing is an exothermic process because heat is released to the surroundings as water changes from liquid to solid.
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