67) This question asks us to consider the statements about process 3. Let's go through the and refute the incorrect ones until we find our answer.
Choice A: This answer choice states the rate of change in temperature is dependent on the specific heat of the substance.
The specific heat capacity is used when the temperature is changing. This equation proves that the specific heat and the rate of change in temperature are inversely related and, therefore, dependent on each other. This means choice A is true.
Choice B & C: These two answer choices state that the rate of change of temperature is dependent on the latent heat of the object. Let's validate these statements. We can express the relationship between the heat energy added and the latent heat as follows.
This equation works for both latent heat of fusion and latent heat of vaporization. You can tell from the equation that there is no relation with temperature. This equation is used during a phase change process (eg: solid to liquid; liquid to gas). This relation tells us that during a phase change, the temperature of the object is constant, even though heat energy is added. Since the temperature is constant, choices B and C are false.
Choice D & E: These answer choices state the phase of the substance. A substance expands as the temperature increases. There are 3 processes(Processes 1, 3, and 5) on the graph where the temperature is increasing. We know that process 1 will be a solid expanding because it has the lowest changing temperature out of the three. Process 5 will be gas expanding; since it has the highest changing temperature of the 3 processes. This means process 3 will be when the substance is a liquid expanding, so choices D and E are false.
Answer: A
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