Unit 7/8 Study Guide…Test on 12/15
Name:________________________
Rotation:____________
1. Know the definitions for the following words.
Energy— the ability to do work or cause change
Kinetic energy— the energy of motion
Potential energy— stored energy
Energy transformation— the ability for energy to change from one form to another
2. What are the three methods of heat transfer?
Conduction, Convection and Radiation
3. What does the Law of Conservation of energy state?
Energy cannot be created or destroyed, but only transformed to another type
of energy.
4. Describe the terms conduction, convection, and radiation.
a. Conduction: Heat transfers through conduction by direct contact.
b. Convection: Heat transfers through convection by the rising and falling of liquids and
gases such as water and air.
c. Radiation: Heat transfers through radiation by electromagnetic waves.
5.
Give an example of conduction, convection, and radiation.
a. Conduction: An example would be placing a metal spoon in a cup of hot chocolate.
The spoon gets hot because it is directly touching the hot chocolate.
b. Convection: An example would be turning on the air conditioner in your house.
The cold air circulates through your house until the temperature has evened out.
c. Radiation: An example would be the suns heat traveling to Earth or a microwave
heating food.
Unit 7/8 Study Guide…Test on 12/15
Name:________________________
Rotation:____________
6. What are the 7 different types of kinetic and potential energy? (hint: MRS. CENT)
Mechanical, Radiant, Sound, Chemical, Electrical, Nuclear and Thermal
7. If your body temperature is 37oC and you are sitting in a room which has a
temperature of 25oC, will your body gain or lose thermal energy? Explain.
Your body would lose thermal energy because your warmer body temperature
would transfer heat to the cooler room.
8. Why does 2 L of water at 80o C have more thermal energy than 1 L of water at the
same temperature?
2L of water would have more thermal energy because there are more particles
in 2L than 1L.
9. If you don’t drink all of your hot cocoa, you know if you leave it that it will get cold.
Explain why.
The heat from the hot cocoa will transfer to the room or table it is sitting on
since both would be cooler than the hot cocoa. The heat would transfer until
the temperatures were the same.
10. A fire burning wood would be an example of _chemical__ energy being converted
into __thermal____ energy.
11. A lamp would be an example of __electrical___ energy being converted into
__radiant___ energy.
12. What are convection currents?
The rising and sinking of warmer and cooler liquids or gasses in a circular
patterns due to density.
13. Fill in the blanks in the following sentence to describe the predicted pattern for
heat transfer. Heat always travels from warmer matter to cooler matter.
14. In a convection current, the warmer air or liquid _rises__ because it is less dense
whereas the cooler air or liquid _sinks__ because it is more dense.
Unit 7/8 Study Guide…Test on 12/15
Name:________________________
Rotation:____________
15. Think about how you can make popcorn. You can pop the kernels inside a bag in the
microwave or you can pop the kernels in a pan placed on a stove burner. Explain how
thermal energy is transferred by conduction, convection or radiation for each
example. The example in the microwave would be the transfer of heat through
radiation and the example of the pan on the stove would be conduction.
16. Write an example for the following energy transfers that is not mentioned in any of
the above examples.
MechanicalThermal: A person briskly rubbing their hands together to warm up
ChemicalMechanical: A person who eats breakfast then plays basketball
ElectricalRadiant: A lamp that is plugged in and turned on
ElectricalSound: A speaker that is plugged in playing music
17-23. Match the following word to the correct definition.
_E_17.chemical energy
A. Energy stored in the nucleus of an atom
_F_18.mechanical energy
B. Energy carried by electromagnetic waves
_B_19.radiant energy
C. Energy produced by electric charges
_C_20.electrical energy
D. Energy related to the temperature of substances
_A_21.nuclear energy
E. Energy stored in matter due to its chemical makeup
_D_22.thermal energy
F. Energy that is moving or has the potential to move
Unit 7/8 Study Guide…Test on 12/15
Name:________________________
Rotation:____________
24-32. Write the word Conduction, Convection or Radiation next to each statement.
24. Radiation
This type of heat is transferred in waves.
25. Convection As a gas or a liquid is heated, it rises because it is less dense and as it
cools it becomes denser and falls.
26. Conduction_ The transfer of heat between substances that are in direct contact with
each other.
27. _Radiation_ The light bulb in the lizard tank was on all day.
28. Conduction Frying a pancake on a stove.
29. Convection This type of heat causes the tectonic plates to move.
30. Convection The method by which heat moves through gases and liquids.
31. Conduction When you heat a metal strip at one end, the heat travels to the other end.
32. Radiation This type of heat is transferred in waves.