Heat of Fusion and Vaporization
Chemistry ⇒ Thermochemistry and Energetics
Heat of Fusion and Vaporization starts at 10 and continues till grade 12.
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See sample questions for grade 10
A student heats 20 g of ice at 0°C with 6680 J of energy. How much ice will remain unmelted? (Heat of fusion = 334 J/g)
Describe the difference between heat of fusion and heat of vaporization.
Describe what happens at the molecular level during vaporization.
Describe what happens to the temperature of a substance during a phase change, such as melting or boiling.
Explain why condensation releases energy to the surroundings.
Explain why sweating cools the body in terms of heat of vaporization.
A student heats 20 g of ice at 0°C with 6680 J of energy. How much ice will remain unmelted? (Heat of fusion = 334 J/g)
If 5000 J of energy is supplied to 10 g of ice at 0°C, will all the ice melt? (Heat of fusion = 334 J/g)
Which of the following best defines the heat of vaporization? (1) Energy required to melt a solid (2) Energy required to freeze a liquid (3) Energy required to boil a liquid (4) Energy required to condense a gas
Which of the following best describes the process of melting? (1) Solid to liquid (2) Liquid to gas (3) Gas to solid (4) Liquid to solid
Which of the following best explains why ice is used to keep drinks cold? (1) Ice absorbs heat as it melts (2) Ice releases heat as it melts (3) Ice absorbs heat as it freezes (4) Ice releases heat as it vaporizes
Which of the following is an endothermic process? (1) Freezing (2) Condensation (3) Melting (4) Solidification
Fill in the blank: The energy required to change 1 mole of a liquid to gas at constant temperature is called the ______ of vaporization.
Fill in the blank: The heat of fusion for water is approximately ______ J/g.
Fill in the blank: The heat of fusion is measured in units of ______ per gram or per mole.
Fill in the blank: The process of a liquid changing to a gas at its boiling point is called ______.
True or False: During melting, the temperature of a substance increases as it absorbs heat.
True or False: The energy required to freeze a liquid is equal in magnitude to the energy required to melt the same mass of solid.
True or False: The heat of fusion and heat of vaporization are both examples of latent heat.
True or False: The heat of fusion for water is higher than the heat of vaporization for water.
