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Why does your hand feel cold when you touch an ice cube?
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8. Thermochemistry
Endothermic & Exothermic Reactions
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Which of the following best describes the process of freezing water?
A
It is an endothermic process because heat is released to the surroundings.
B
It is an exothermic process because heat is released to the surroundings.
C
It is an endothermic process because heat is absorbed from the surroundings.
D
It is an exothermic process because heat is absorbed from the surroundings.
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Understand the definitions of endothermic and exothermic processes: An endothermic process absorbs heat from the surroundings, while an exothermic process releases heat to the surroundings.
Recall the phase change involved in freezing water: freezing is the transition from liquid water to solid ice.
Consider the energy changes during freezing: when water freezes, molecules lose energy and form a more ordered solid structure, which typically releases heat to the surroundings.
Apply the concept to the problem: since freezing releases heat, it is an exothermic process.
Conclude that the correct description is: freezing water is an exothermic process because heat is released to the surroundings.
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