Heating Curve Worksheet | PDF - Free Printable
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Step-by-step solution for: Heating Curve Worksheet | PDF
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Show Answer Key & Explanations
Step-by-step solution for: Heating Curve Worksheet | PDF
Let's analyze the heating curve provided in the worksheet and answer each question step by step.
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A heating curve shows how the temperature of a substance changes as energy (heat) is added. The graph has temperature on the y-axis and energy added on the x-axis.
Key features:
- Sloped lines: Temperature is increasing → kinetic energy is increasing.
- Flat (horizontal) lines: Phase change is occurring → temperature remains constant; energy is used to break intermolecular forces.
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- Point a: Solid being heated from -5°C to 5°C.
- Segment b: Flat line at 5°C → melting (solid to liquid).
- Segment c: Liquid being heated from 5°C to 15°C.
- Segment d: Flat line at 15°C → boiling (liquid to gas).
- Segment e: Gas being heated above 15°C.
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Now, let’s answer each question:
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- Freezing point = temperature at which liquid turns to solid.
- This occurs at the same temperature as melting point but in reverse.
- Melting happens at 5°C, so freezing point is also 5°C.
✔ Answer: 5°C
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- Melting occurs during segment b, where the temperature stays at 5°C while solid turns to liquid.
✔ Answer: 5°C
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- Boiling occurs during segment d, where the temperature stays at 15°C while liquid turns to gas.
✔ Answer: 15°C
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- This is the first sloped section: from -5°C to 5°C before melting begins.
- That is segment a.
✔ Answer: a
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- After melting (b), the liquid is heated from 5°C to 15°C.
- This is segment c.
✔ Answer: c
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- After boiling (d), the gas is heated above 15°C.
- This is segment e.
✔ Answer: e
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- Melting occurs at constant temperature (5°C), shown by the flat segment b.
✔ Answer: b
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- Kinetic energy increases when temperature increases (because molecules move faster).
- This happens during sloped segments (a, c, e).
- During flat segments (b and d), temperature is constant → no change in kinetic energy (only potential energy changes).
✔ Answer: a, c, e
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- Condensation is the reverse of boiling — gas turning into liquid.
- But this heating curve only shows heating, not cooling.
- So condensation does not occur in this graph.
- However, if we were to reverse the process, segment d would represent condensation.
- But since it's a heating curve, condensation is not shown.
⚠️ Important: Condensation is not represented on this heating curve.
✔ Answer: None / Not shown
> (Note: If this were a cooling curve, segment d would be condensation. But here, it's boiling.)
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1. 5°C
2. 5°C
3. 15°C
4. a
5. c
6. e
7. b
8. a, c, e
9. None (or not shown)
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Let me know if you'd like a labeled version of the graph or further explanation!
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🔍 Understanding the Heating Curve:
A heating curve shows how the temperature of a substance changes as energy (heat) is added. The graph has temperature on the y-axis and energy added on the x-axis.
Key features:
- Sloped lines: Temperature is increasing → kinetic energy is increasing.
- Flat (horizontal) lines: Phase change is occurring → temperature remains constant; energy is used to break intermolecular forces.
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📊 Breakdown of the Graph:
- Point a: Solid being heated from -5°C to 5°C.
- Segment b: Flat line at 5°C → melting (solid to liquid).
- Segment c: Liquid being heated from 5°C to 15°C.
- Segment d: Flat line at 15°C → boiling (liquid to gas).
- Segment e: Gas being heated above 15°C.
---
Now, let’s answer each question:
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1. What is the freezing point of the above substance?
- Freezing point = temperature at which liquid turns to solid.
- This occurs at the same temperature as melting point but in reverse.
- Melting happens at 5°C, so freezing point is also 5°C.
✔ Answer: 5°C
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2. What is the melting point of the above substance?
- Melting occurs during segment b, where the temperature stays at 5°C while solid turns to liquid.
✔ Answer: 5°C
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3. What is the boiling point of the above substance?
- Boiling occurs during segment d, where the temperature stays at 15°C while liquid turns to gas.
✔ Answer: 15°C
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4. What letter represents the temperature range where the solid is being heated?
- This is the first sloped section: from -5°C to 5°C before melting begins.
- That is segment a.
✔ Answer: a
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5. What letter represents the temperature range where the liquid is being heated?
- After melting (b), the liquid is heated from 5°C to 15°C.
- This is segment c.
✔ Answer: c
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6. What letter represents the temperature range where the gas is being heated?
- After boiling (d), the gas is heated above 15°C.
- This is segment e.
✔ Answer: e
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7. What letter represents the melting of the solid?
- Melting occurs at constant temperature (5°C), shown by the flat segment b.
✔ Answer: b
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8. What letter(s) show a change in kinetic energy?
- Kinetic energy increases when temperature increases (because molecules move faster).
- This happens during sloped segments (a, c, e).
- During flat segments (b and d), temperature is constant → no change in kinetic energy (only potential energy changes).
✔ Answer: a, c, e
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9. What letter represents condensation?
- Condensation is the reverse of boiling — gas turning into liquid.
- But this heating curve only shows heating, not cooling.
- So condensation does not occur in this graph.
- However, if we were to reverse the process, segment d would represent condensation.
- But since it's a heating curve, condensation is not shown.
⚠️ Important: Condensation is not represented on this heating curve.
✔ Answer: None / Not shown
> (Note: If this were a cooling curve, segment d would be condensation. But here, it's boiling.)
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✔ Final Answers:
1. 5°C
2. 5°C
3. 15°C
4. a
5. c
6. e
7. b
8. a, c, e
9. None (or not shown)
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Let me know if you'd like a labeled version of the graph or further explanation!
Parent Tip: Review the logic above to help your child master the concept of heating curves worksheet.
