Heat of Vaporization Worksheet
Explore the concept of heat of vaporization, phase changes, and energy transfer in matter for Grade 9 science students.
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Heat of Vaporization
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Read each question carefully and answer to the best of your ability. Show all work for calculations.
1. The amount of energy required to change a liquid into a gas at a constant temperature is called the .
2. When a substance changes from a liquid to a gas, it is undergoing a phase change known as .
3. The heat of vaporization is typically measured in units of per .
1. Which of the following statements is true about the heat of vaporization?
It is the energy required to melt a solid.
It is the energy released when a gas condenses to a liquid.
It is the energy absorbed when a liquid boils.
It is the energy required to raise the temperature of a liquid.
2. Why does sweating cool the body?
Sweat is naturally cold.
The evaporation of sweat absorbs heat from the body.
Sweat creates a barrier against heat.
Sweat increases the body's internal temperature.
1. Define the term 'heat of vaporization' in your own words.
2. Explain the difference between boiling and evaporation.
1. The heat of vaporization is an endothermic process.
True
False
2. The heat of vaporization for water is the same as for ethanol.
True
False
Observe the image below, which depicts a phase change.
1. Identify the phase change occurring in the image that relates to the heat of vaporization.
2. Describe how energy is involved in this process.