Multiple Choice
Which one of the following represents a chemical change?
1. Intro to General Chemistry
Physical & Chemical Changes
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Which of the following changes in the physical state of water require the input of energy?
A
Freezing of liquid water to ice
B
Deposition of water vapor to ice
C
Condensation of water vapor to liquid
D
Melting of ice to liquid water
Verified step by step guidance1
Identify the physical state changes mentioned in the problem: freezing, deposition, condensation, and melting.
Understand that phase changes can either require energy (endothermic) or release energy (exothermic).
Recall that endothermic processes require the input of energy to overcome intermolecular forces, such as melting (solid to liquid), vaporization (liquid to gas), and sublimation (solid to gas).
Analyze each process: Freezing (liquid to solid), deposition (gas to solid), and condensation (gas to liquid) are exothermic, meaning they release energy.
Recognize that melting (solid to liquid) is an endothermic process, requiring the input of energy to break the solid structure and allow the molecules to move more freely as a liquid.
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