Download Chapter 7 Questions_2

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Date: ______________________
Heat and Temperature Unit: Chapter 7 Questions
Sources of Thermal Energy (pgs. 238 – 247)
Science 7
After reading pages 238 to 247 in your textbook, please answer the following questions.
1. What are two ways of producing electrical energy? Give 1 advantage and 1 disadvantage of each.
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2. How is mechanical energy converted to thermal energy? Give two examples of this.
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3. What is the difference between active and passive solar energy?
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4. What is the “greenhouse effect” and why does it pose a problem? How are greenhouse gases involved?
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Multiple Choice:
1. Much of the energy used in Alberta is found in the vast resources of fossil fuels. This type of energy
source is useful and is stored until we need it. Fossil fuels are considered to be sources of
a)
b)
c)
d)
chemical energy
industrial energy
biological energy
geothermal energy
2. Electrical energy can be generated at a dam, using generators and can also be generated by thermalelectric generating stations which burn coal. The central reason that thermo-generating stations are used
is because
a)
b)
c)
d)
coal is so abundant
it is cheaper and cleaner
a large waterfall is not always available
heated water is more efficient
3. Thermal energy from inside the Earth’s crust can be harnessed as a useful thermal energy source.
Volcanoes, hot springs and geysers are examples of this type of thermal energy source. This type of
thermal energy is
a)
b)
c)
d)
an environmental pollutant
a clean alternative to using fossil fuels
called geovolcanic energy
used to generate fossil fuel resources
4. Co-generation is the use of
a)
b)
c)
d)
electrical energy to get waste energy
waste energy to generate electrical energy
waste energy to generate mechanical energy
mechanical energy to generate waste energy