Name ___________________________________________________________________ Period ______________
Unit 3, Lesson 2 - Energy Transfer Study Guide (85) Answer key
1. Explain how air moves. Air moves from high pressure to low pressure.
2. Temperature – the measure of the average kinetic energy of particles
3. Thermal energy – total kinetic energy of particles
4
. Thermal expansion – the increase in volume that results from an increase in temperature (molecules spreading
apart due to being heated)
5. Density – mass per unit volume of a substance
6. Heat – energy that is transferred between objects that are different temperature
7. Specific heat – the different rates at which materials become warmer or cooler
8. Radiation – transfer of heat/energy by electromagnetic waves
9. Convection – transfer of heat/energy due to movement of matter
10. Convection current – The cycling of matter (hot rising, cool sinking)
11. Conduction – transfer of heat by direct contact
12. Do hot substances have more or less kinetic energy than cool substances? _______more______________
13. What process (circle one) is responsible for heating the atmosphere?
Radiation from clouds
radiation from land
radiation from the sun
14. Explain what happens to molecules as they are heated.
As molecules are heated they move faster and spread apart. This makes the air less dense and has lower air
pressure.
15. Which of the following (circle one) will have the greatest thermal energy?
12 degrees C
14 degrees C
24 degrees C
10 degrees C
16. Warm air or water rising and cool air or water sinking is what kind of heat/energy transfer? convection
17. What kind of energy transfer is taking place when an ice cube in placed in your hand? conduction
18. Which energy transfer is the only type that can go through empty space and can transfer heat between
molecules? radiation
19. Draw or explain an example of conduction, convection and radiation. (Three drawings or explanations.)
Conduction
Your hand touching a hot pan
Convection
The top floor of a house is hotter than the basement
Radiation
Heat coming from the sun