Heating Curve Analysis
A Grade 9 science worksheet on heating curves, phase changes, and related concepts.
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Heating Curve Analysis Worksheet
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Read each question carefully and answer to the best of your ability. Refer to the heating curve diagram provided for questions that require it.
Observe the heating curve below. It represents the change in temperature of a substance as heat is added over time.
1. What is happening to the substance's temperature in segments B and D of the heating curve?
The temperature is increasing.
The temperature is decreasing.
The temperature remains constant.
The substance is boiling rapidly.
2. What phase change occurs during segment B of the heating curve?
Melting
Boiling
Condensation
Sublimation
3. During a phase change, the added heat energy is used to break the between particles, rather than increasing their kinetic energy.
4. The flat regions on a heating curve (like segments B and D) indicate a is occurring.
5. The melting point and freezing point of a pure substance are typically the same temperature.
True
False
6. In segment A of the heating curve, the substance is entirely in the liquid phase.
True
False
7. Explain why the temperature does not change during a phase transition, even though heat is continuously being added.
8. Describe the states of matter present in segments A, C, and E of the heating curve.
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