Multiple Choice
Why does water heat up and cool down slowly compared to many other substances?
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8. Thermochemistry
Heat Capacity
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Which term describes the amount of energy required to change a solid to a liquid at its melting point?
A
Specific heat capacity
B
Heat of vaporization
C
Heat of fusion
D
Enthalpy of formation
Verified step by step guidance1
Understand that the problem is asking for the term that describes the energy required to change a solid into a liquid at its melting point.
Recall that the energy required to change a substance from solid to liquid without changing temperature is called the heat of fusion.
Differentiate this from other terms: Specific heat capacity is the energy needed to raise the temperature of a substance, heat of vaporization is the energy to change liquid to gas, and enthalpy of formation is the energy change when a compound forms from its elements.
Recognize that since the phase change is from solid to liquid at the melting point, the correct term is heat of fusion.
Summarize that heat of fusion specifically refers to the latent heat absorbed or released during melting or freezing at constant temperature.
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