Multiple Choice
Which of the following is true for all reversible endothermic processes?
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8. Thermochemistry
Endothermic & Exothermic Reactions
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Which one of the following phase changes is endothermic?
A
Gas to solid (deposition)
B
Liquid to solid (freezing)
C
Gas to liquid (condensation)
D
Solid to liquid (melting)
Verified step by step guidance1
Understand that an endothermic process is one that absorbs heat from the surroundings.
Recall the nature of phase changes: melting (solid to liquid) and vaporization (liquid to gas) require energy input to overcome intermolecular forces, so they are endothermic.
Recognize that the reverse processes—freezing (liquid to solid), condensation (gas to liquid), and deposition (gas to solid)—release energy and are therefore exothermic.
Identify that among the given options, 'solid to liquid (melting)' involves absorbing heat to break the solid structure, making it endothermic.
Conclude that the phase change 'solid to liquid (melting)' is endothermic because it requires heat input to convert a solid into a liquid.
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