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**Heating/Cooling Curve and Phase Diagrams**

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**Heating/Cooling Curve and Phase Diagrams**

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. Solution: 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 Liquid gas Phase 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 H2O 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, H2O 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, H2O exists in which phase of matter?

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