Name
LESSON
Date
Outline
Heat
Use your textbook to help you fill in the blanks.
What is heat?
kinetic
1. Heat is a form of
energy
caused by the movement of the molecules that make
up all matter.
higher
2. Thermal energy always moves from a(n)
temperature material to a lower-temperature material.
3. As heat flows into a substance, the kinetic energy of the
molecules
in the substance increases.
How does heat travel?
4. Heat energy can move in three ways: by conduction,
by convection, and by
radiation
.
5. Conduction is the movement of energy when two
touch
materials
one material to the other.
and energy flows from
6. Conduction is the only way that thermal energy can travel
through
solids
.
© McGraw-Hill Education
7. Because most liquids and gases become less dense
when heated,
convection
occurs.
How do we use heat?
8. In a hot-water heating system, water is used to transfer
energy from a(n)
a room.
Unit 5 • Properties of Energy
Unit Resources
boiler
to the air in
Use with Lesson 5
Heat
5-59
LESSON
Outline
Name
Date
9. In a forced-air heating system, a room is heated by
air
alone.
10. Heating systems turn on and off automatically because
they are controlled by a(n)
switch.
thermostat
11. Gasoline is the fuel that is burned in the engine of a car,
heat
but it is
makes the engine move.
energy that actually
What is specific heat?
12. The amount of energy needed to raise the temperature
of 1 gram of a substance by 1°C is the substance’s
specific heat
.
13. It takes a large amount of thermal energy to
increase the temperature of an object with a(n)
high
specific heat.
14. A material with a high specific heat cools down more
slowly
than a material with a low specific
heat.
Critical Thinking
Possible answer: Cold makes things contract, or get smaller, so the
air inside the balloon would be compressed, and the balloon itself
would become smaller.
5-60
Unit 5 • Properties of Energy
Unit Resources
Use with Lesson 5
Heat
© McGraw-Hill Education
15. What do you think would happen if you were to put an
inflated balloon in the freezer? Explain.