Grade 12 Chemistry: Heating Curve Analysis
This worksheet focuses on understanding and interpreting heating curves for different substances, including phase transitions and energy calculations.
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Grade 12 Chemistry: Heating Curve Analysis
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Read each question carefully and provide detailed answers based on your understanding of heating curves and phase changes.
1. Sketch a typical heating curve for water, starting from ice at -10°C and ending with steam at 110°C. Label all axes, phases of matter, and phase transition points (melting/freezing point and boiling/condensation point).
2. During the flat regions of a heating curve, the added heat energy is used to overcome forces between particles, rather than increasing the energy of the substance.
3. The amount of energy required to melt one mole of a solid at its melting point is known as the of fusion.
4. The steeper the slope of a segment on a heating curve, the the specific heat capacity of that phase.
5. Which of the following statements is true regarding a substance at its boiling point?
All the kinetic energy is converted to potential energy.
The temperature of the substance increases rapidly.
Both liquid and gaseous phases coexist at a constant temperature.
The specific heat capacity of the substance becomes infinite.
6. A substance has a high heat of vaporization. What does this imply about the intermolecular forces in the liquid phase?
They are weak.
They are strong.
They are non-existent.
They only exist in the gaseous phase.
7. The temperature of a substance remains constant during a phase change, even though heat is continuously being added or removed.
True
False
8. Explain why a burn from steam at 100°C is often more severe than a burn from boiling water at 100°C.
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