What does the term “heat capacity” refer to?

A) The amount of heat required to vaporize 1 gram of a substance.
B) The energy released when a substance cools.
C) The total amount of heat needed to raise the temperature of a given object by 1°C.
D) The energy needed to raise the temperature of 1 gram of a substance by 1°C.

Question

What does the term “heat capacity” refer to?

A) The amount of heat required to vaporize 1 gram of a substance.
B) The energy released when a substance cools.
C) The total amount of heat needed to raise the temperature of a given object by 1°C.
D) The energy needed to raise the temperature of 1 gram of a substance by 1°C.

BlackTom AI · Accepted Answer

Let’s break down what each choice says about heat capacity and compare it to the standard definitions.
Option A: 'The amount of heat required to vaporize 1 gram of a substance.' This describes a latent heat concept (specifically heat of vaporization per gram) and is not heat capacity. Heat capacity concerns raising temperature, not phase change per se.
Option B: 'The energy released when a substance cools.' This describes cooling energy but is not a direct definition of heat capacity. Heat capacity relates to heating, not the energy released during cooling, and it doesn’t specify how much heat is involved for a given temperature change.
Option C: 'The total amount of heat needed to raise the temperature of a given object by 1°C.' This aligns with the general definition of heat capacity: the amount of heat required for a specified temperature change of an object as a whole, regardless of the amount of substance, though the exact quantity depends on the object.
Option D: 'The energy needed to raise the temperature of 1 gram of a substance by 1°C.' This describes the specific heat capacity (per gram) rather than the overall heat capacity of an object. It divides heat by mass, giving a property that is size-independent per unit mass, and is not the total heat capacity of an object.
In summary, A misstates a phase-change quantity, B misconstrues cooling energy, C correctly captures the total heat required for a unit temperature rise of the object, and D points to a per-mass version (specific heat), not the total heat capacity. The distinctions hinge on whether we’re talking about the whole object (capacity) or per-mass properties (specific heat).

2254 CHEM 0101 SEC2010 HW 11

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