Practice Review: States of Matter

Which states of matter are present in this sealed container?

• solid and gas

• liquid and gas

• solid and liquid

• solid, liquid, and gas

The total kinetic energy of the molecules in a substance refers to its

• heat

• temperature

• momentum

• viccosity

When you add heat energy to a substance

• its molecules slow down

• its molecules speed up

• its molecules get larger

• its molecules break apart

Particles, or atoms, in a high pressure gas are exerting ______ forces on the container

• minimal (small)

• thermal

• constant

• large

Heating is the transfer of _____ from a warmer substance to a cooler one.

• molecules

• thermal energy

• potential energy

• electrons

A liquid substance heats up and changes into a gas. Assuming it starts and ends the process in the same closed container, what must be true about the system's pressure?

• Pressure DECREASES because gases are less dense than liquids

• Pressure INCREASES because molecules have more kinetic energy

• Pressure REMAINS CONSTANT because the container size does not change

• There is NOT enough information to make a prediction about the system's pressure.

When a substance LOSES heat energy, _________

• its molecules slow down

• its molecules speed up

• its molecules are not affected

• its molecules break apart

When a system changes temperature through heating or cooling, what happens to its thermal energy?

• It stays constant because energy is never gained or lost

• It decreases because any change in a system uses up energy

• It increases or decreases depending on whether energy was added or removed, respectively

• It decreases during the temperature change and then increases when the temperature stabilizes.

If a substance has a lot of thermal energy, its atom and molecules are ______

• moving very slowly

• moving upward against the force of gravity

• moving very rapidly (quickly)

• moving together in the same direction

If you increase the number of collision between gas molecules and the container holding the gas, which will also increase?

• pressure

• chemical energy

• specific heat

• volume