In which changes do the particles move further apart?

• W and X

• W and Z

• X and Y

• Y and Z

Diagram X, Y and Z represent the three states of matter.

Which change occurs during boiling?

• X to Y

• Y to Z

• Z to X

• Z to Y

Which change of state take place during evaporation?

• gas to liquid

• liquid to gas

• liquid to solid

• solid to gas

In which substance are the particles close together and slowly moving past each other?

• Air

• Ice

• Steam

• Water

The diagrams show the arrangement of particles in three different physical states of substance X.

Which statement about the physical states of substance X is correct?

• Particles in state 1 vibrate about fixed positions

• State 1 changes to state 2 by diffusion

• State 2 changes directly to state 3 by condensation

• The substance in stage 3 has a fixed volume

The kinetic theory of matter explores the spatial relationship between the particles in solids, liquids, and gases.

Which of the following processes causes the distance between particles to increase by the most?

• Melting

• Freezing

• Sublimation

• Condensation

The following four statements describe the arrangement of particles in a substance.

1. 1. Particles are moving in all directions

2. 2. Particles are arranged in neat rows

3. 3. Particles can move past each other

4. 4. Particles vibrate about their positions

Which of the four statements describe the arrangement of particles in a solid?

• 1 and 2

• 2 and 4

• 1 and 3

• 2 only

Matter exist in three states which are solid, liquid, and gas. Phase changes occur when matter changes from one state to another.

In which changes do the particles move closer together?

• 3 and 4

• 1 and 3

• 4 only

• 1 and 2

Which state of matter has a definite shape, a definite volume and cannot flow?

• Liquid

• Solid

• Solids and gases

• Gas

The boiling point of a substance is the temperature at which it changes from ........

• a liquid to a solid

• a gas to a solid

• a solid to a liquid

• a liquid to a gas