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Heating/Cooling Curve and Phase Diagrams

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A heating curve shows how the temperature of a substance changes as heat is added at a constant rate.

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Heating/Cooling Curve and Phase Diagrams The heating curve at right shows the temperature change in a sample of iron as heat is added at a constant rate. The sample starts out as a solid and ends as a gas. Describe the phase change that occurred between points B and C on the graph. Describe the phase change that occurred between points B and C on the graph. Solution: Between points B and C, the sample changed from solid to liquid. Between points B and C, the sample changed from solid to liquid.

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Heating/Cooling Curve and Phase Diagrams 1. In the heating curve for iron, describe the phase change that occurred between points D and E on the graph.

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Heating Cooling Curve and Phase Diagrams 2. Explain why the temperature stayed constant between points D and E.

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Heating Cooling Curve and Phase Diagrams 3. What is the melting temperature of iron?

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Heating Cooling Curve and Phase Diagrams 4. What is the freezing temperature of iron? How do you know?

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Heating Cooling Curve and Phase Diagrams 5. What is the boiling temperature of iron?

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Heating Cooling Curve and Phase Diagrams 6. Compare the boiling temperatures of iron and water (water boils at 100°C). Which substance has stronger intermolecular forces? How do you know?

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Heating Cooling Curve and Phase Diagrams 7. Between which two points on the graph did freezing occur?

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Heating Cooling Curve and Phase Diagrams 8. What is the freezing temperature of stearic acid? What is its melting temperature?

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Heating Cooling Curve and Phase Diagrams 9. Compare the melting temperature of stearic acid with the melting temperature of water. Which substance has stronger intermolecular forces? How do you know?

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Heating Cooling Curve and Phase Diagrams 10. Can a substance be cooled to a temperature below its freezing point? Use evidence from any of the graphs in this skill sheet to defend your answer.

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Heating Cooling Curve and Phase Diagrams States of matter are Solid Solid Liquid Liquid gas gas Phase diagrams pressure-temperature diagrams pressure-temperature diagrams

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Heating Cooling Curve and Phase Diagrams Triple points mark conditions at which three different phases can coexist. For example, the water phase diagram has a triple point corresponding to the single temperature and pressure at which solid, liquid, and gaseous water can coexist in a stable equilibrium

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Heating Cooling Curve and Phase Diagrams 1. At what temperature and pressure does H 2 O exist as a solid, liquid and a gas?

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Heating Cooling Curve and Phase Diagrams 2. At 100°C and a pressure above 1.0 atmosphere, H 2 O exists in which phase of matter?

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Heating Cooling Curve and Phase Diagrams 3. At 100°C and a pressure below 1.0 atmosphere, H 2 O exists in which phase of matter?

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