Grade 12 Phase Change Worksheet
A comprehensive worksheet for Grade 12 Chemistry students covering phase changes, including concepts like latent heat, phase diagrams, and energy calculations.
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Grade 12 Phase Change Worksheet
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Read each question carefully and provide concise, accurate answers. Show all your work for calculations. This worksheet covers various aspects of phase changes.
1. Which of the following phase changes is an endothermic process?
Freezing
Condensation
Sublimation
Deposition
2. What is the critical point on a phase diagram?
The point where solid, liquid, and gas phases coexist.
The temperature above which a substance cannot exist as a liquid.
The pressure at which a substance boils.
The temperature at which a solid melts.
1. The energy required to change a substance from liquid to gas at constant temperature is called the latent heat of .
2. When a substance undergoes freezing, its molecules kinetic energy.
1. Evaporation is an exothermic process.
True
False
2. The triple point on a phase diagram represents the unique temperature and pressure at which all three phases (solid, liquid, and gas) of a substance can coexist in thermodynamic equilibrium.
True
False
1. Explain the difference between boiling and evaporation in terms of temperature and pressure.
Use the diagram below to answer the following questions.
1. Identify the regions on the phase diagram that represent the solid, liquid, and gas phases.
2. Describe what happens to the substance if you start at a low temperature and high pressure (in the solid region) and increase the temperature at a constant pressure until it becomes a gas.
1. Calculate the total heat energy required to convert 50.0 g of ice at -10.0 °C to steam at 110.0 °C. (Specific heat of ice = 2.09 J/g°C, specific heat of water = 4.18 J/g°C, specific heat of steam = 2.01 J/g°C, latent heat of fusion of water = 334 J/g, latent heat of vaporization of water = 2260 J/g).