The diagram below shows the cooling curve for chocolate - Junior Cycle Science - Question 8(b) - 2014
Question 8(b)
The diagram below shows the cooling curve for chocolate.
(i) Which state of matter describes the chocolate when it is at 30 °C?
(ii) Which state of matter describe... show full transcript
Worked Solution & Example Answer:The diagram below shows the cooling curve for chocolate - Junior Cycle Science - Question 8(b) - 2014
Step 1
Which state of matter describes the chocolate when it is at 30 °C?
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Answer
At 30 °C, the chocolate is in a liquid state. This is because chocolate melts at temperatures above its melting point, which is typically around 30 °C.
Step 2
Which state of matter describes the chocolate when it is at 10 °C?
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Answer
At 10 °C, the chocolate is in a solid state. The chocolate has cooled below its melting point, thus solidifying.
Step 3
In terms of heat loss or heat gain, describe and explain what happens to the chocolate between position A and position B on the diagram.
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Between positions A and B, the chocolate undergoes heat loss. During this period, the temperature of the chocolate decreases as it releases heat to the surrounding environment. There is a phase where the chocolate may not change temperature significantly, but it is still losing heat, particularly if it is transitioning to a solid state, where latent heat is involved. This heat loss is crucial for the formation of the solid structure of the cooled chocolate.
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