Name: ____________________
Segment: _______
Heat Unit
Study Questions KEY
1. Heat is thermal energy moving from a warmer object to a cooler object.
a. warmer; cooler
b. cooler; warmer
c. stationary; moving
d. slower; faster
2. List three ways that heat can transfer. conduction, convection, radiation
3. Energy from the sun is radiation
4. Explain specific heat. amount of heat needed to raise temperature of 1 kg of material by 1 ᵒC
5. Wind and ocean currents are formed by convection.
a. conduction
b. convection
c. radiation
d. evaporation
6. Which of the following are good conductors of heat:
o copper
o plastic
o glass
o aluminum
7. Thermal energy increases as temperature increases.
a. increases
b. decreases
c. remains constant
d. contracts
8. A heat engine converts heat into work.
9. Which of the following do NOT require the presence of matter particles?
a. conduction
b. convection
c. radiation
d. condensation
10. Explain why water is the exception when it comes to thermal expansion. water expands when cooled
whereas most matter expands when heated
11. A heat engine is a device that converts thermal energy into mechanical energy.
12. Explain how heat is transferred in convection? heat is transferred by the movement of currents within a
fluid
13. Draw how convection currents would appear in this pot of boiling water.
14. Which law of thermodynamics states that it's impossible for heat to flow from cool objects to
warmer objects unless work is done? 2nd
15. A material that reduces the flow of heat is a(n) insulator
16. Identify the SI unit used for temperature. Kelvin (K)
17. The most common type of heating system in use today is the forced-air system.
a. electrical
b. solar
c. radiation
d. forced-air
18. Explain why solids and liquids are better conductors of heat than gases. particles are close together more collisions occur allowing them to conduct heat better
19. Heat is a form of energy, so it is measured in joules
20. Explain why the specific heat of water makes it a useful coolant. Water has high specific heat so it can
absorb heat without large change in temperature
21. The sum of the potential energy and kinetic energy of all the particles in an object is the thermal
energy of the object.
a. speed, direction
b. specific heat, temperature
c. potential energy, kinetic energy
d. mass, volume
22. Your grandma needs to put on oven mitts when taking a hot pan out of the oven. Determine which
transfer of thermal energy she is being careful to avoid. conduction - hands on hot pan
23. The temperature of an object is a measure of the average kinetic energy of the particles of the
object.
24. Explain why increasing the temperature of an object increases its thermal energy. increasing the
temperature increases the kinetic energy of particles
25. Refrigerators and air conditioners are examples of _____.
a. heat pumps
b. heat movers
c. heat engines
d. coolant mover
26. thermodynamics is the study of the relationship among thermal energy, heat and work.
27. Solar heating systems convert radiant energy from the Sun to thermal energy.
28. Determine which state of matter makes the best insulator. gas
29. A(n) _____ system uses ducts to move heated air through home.
a. solar
b. forced-air
c. radiator
d. electrical
30. Explain how a jacket with air pockets acts as a good insulator during winter. air slows the flow of
body heat to the colder outside air
31. The transfer of energy by the motion of heated particles in a fluid is called convection.
32. Explain how kinetic energy is transferred during conduction. Particles collide through matter by direct
contact.