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The graph is a cooling curve - Junior Cycle Science - Question c - 2006
Question c
The graph is a cooling curve. The substance used in this experiment was naphthalene. Naphthalene has a melting point of 80 °C. The rate of heat loss was constant thr... show full transcript
Worked Solution & Example Answer:The graph is a cooling curve - Junior Cycle Science - Question c - 2006
Step 1
What is happening to the naphthalene between points A and B on the graph?
Answer
Between points A and B on the cooling curve, the naphthalene is undergoing a phase change from a liquid to a solid. This process is referred to as freezing or solidifying, where the substance loses heat and transitions from its liquid state to a solid state.
Step 2
What is the heat loss, between points A and B, on the curve called?
Answer
The heat loss between points A and B on the cooling curve is known as the latent heat of fusion. This represents the amount of heat energy that is released when the naphthalene changes from a liquid to a solid at its melting point.