Phase Changes

The diagram below shows the different phase transitions that occur in matter. Which arrow represents the transition in which dew is formed?

• 4

• 2

• 1

• 6

Which change of state involves a release of energy?

• boiling

• sublimation

• condensation

• melting

Considering the temperature vs. time graph below, how does the temperature at the beginning of a change of state compare with the temperature at the end of the change?

• The temperature is usually higher.

• The temperature is always the same.

• The temperature is usually lower.

• The temperature is always lower.

This heating curve is produced when a certain substance is heated.Which best compares the particles of the substance when it is in region 1 with the particles of the substance when it is in region 3?

• The particles are more orderly in region 1.

• The particles have less freedom of motion in region 3.

• The particles have more kinetic energy in region 1.

• The particles are slower in region 3.

The diagrams below represent the four states of matter.
Which diagram represents a gas that has been ionized?

• diagram 3

• diagram 4

• diagram 1

• diagram 2

Consider the heating curve. In which region are most particles moving the fastest?

• 5

• 4

• 3

• 2

A solid substance turns directly into a gas. Which term describes this change?

• • deposition

• • evaporation

• sublimation

• • melting

 is initially present in a state where its molecules are far apart. During a change of state, its molecules slow down. Which change of state has most likely taken place?

• from a gas to a plasma

• from a solid to a liquid

• from a gas to a liquid

• from a liquid to a gas

The diagrams below represent the four states of matter. Which diagram represents the phase that occurs after a solid melts?

• diagram 4

• diagram 1

• diagram 3

• diagram 2

In which phase transition do molecules move directly from a state involving vibration of particles in a fixed position to a state involving random movement of high-speed particles?

• sublimation

• freezing

• evaporation

• deposition