Unit 1 Chemistry

The state of matter in which particles are arranged in either a crystalline or an amorphous form is

• liquid.

• gas.

• solid.

• fluid.

Particles of a liquid

• are tightly packed together and stay in a fixed position.

• have no viscosity.

• decrease in volume with increasing temperature.

• are free to move in a container but remain in close contact with one another.

In which state of matter do the particles spread apart and fill all the space available to them?

• crystal

• liquid

• gas

• solid

The change from liquid to solid, or the reverse of melting, is called

• condensation.

• boiling.

• sublimation.

• freezing.

Figure 5 shows how the temperature of a substance changed as it was heated. Which segment of the graph indicates that the substance was undergoing a change of state?

• A

• B

• C

• D

An uncovered pot of soup is simmering on a stove, and there are water droplets on the wall above the back of the stove. What sequence can you infer has occurred?

• melting, then boiling

• freezing, then thawing

• vaporization, then condensation

• condensation, then vaporization

According to Boyle’s law, when the pressure of a gas increases at constant temperature, its volume

• increases.

• stays constant.

• decreases.

• increases, then decreases.

When a person wearing glasses enters a warm house after being outside on a cold day, their glasses fog up because of

• vaporization.

• condensation.

• sublimation.

• melting.

Which of the following is an endothermic change?

• melting

• freezing

• condensation

• all of the above

The opposite of vaporization is called

• condensation.

• sublimation.

• evaporation.

• freezing.