thermal energy

When you touch a piece of ice, heat transfers from ……to……..

• Ice -hand

• Ice -the body

• Hand -ice

• Ice -air

Melting point of a substance is the temperature at which……… change to ………….

• Solide -liquid

• Liquid -gas

• Gas -liquid

• Liquid -solid

The transformation of solid to liquid is called melting and the reverse process

is called freezing.

• True

• False

When wax melts, its particles

• gain thermal energy and speed up

• gain thermal energy and slow down.

• lose thermal energy and speed up.

• . lose thermal energy and slow down.

The state(s) of matter with the greatest amount of energy is/are

• Gas

• Liquid

• Solid

• Solid and liquid

Changing ice into water folowed by changing water into steam show two different processes which are………and………

• Freezing-condensation

• Evaporation-condensation

• Melting-freezing

• Melting -evaporation

Objects with more thermal energy have kinetic energy.

• More

• Less

• The same

• No

By decreasing the thermal energy, the kinetic energy increases.

• True

• False

Expansion joints are designed to allow concrete……….when temperature …………to keep bridges safe from buckling.

• Expand -decrease

• Expand -increase

• Expand- don’t change

• Contract -doesn’t change

When a substance expands, its volume increases.

• False

• True