Level 8 Chemistry Pre-Test

Which of the following best describes the particles in a solid state?

• Particles are far apart and move freely.

• Particles are closely packed and vibrate in place.

• Particles are randomly arranged and move quickly.

• Particles are loosely packed and slide past each other.

What happens to the particles of a substance as it changes from a liquid to a gas?

• Particles move closer together and slow down.

• Particles move further apart and speed up.

• Particles become tightly packed and stop moving.

• Particles rearrange into a fixed pattern.

Which of the following is an example of a chemical change?

• Melting ice.

• Dissolving sugar in water.

• Burning wood.

• Boiling water.

What is the main difference between a physical change and a chemical change?

• Physical changes create new substances, chemical changes do not.

• Chemical changes are reversible, physical changes are not.

• Physical changes do not alter the composition of a substance, chemical changes do.

• Chemical changes involve a change in state, physical changes do not.

Which of the following statements is true about gases?

• Gases have a definite shape and volume.

• Gases have a definite volume but no definite shape.

• Gases have no definite shape or volume.

• Gases have a definite shape but no definite volume.

What is the process called when a solid changes directly into a gas?

• Condensation

• Sublimation

• Evaporation

• Freezing

Which of the following is a sign of a chemical reaction?

• Change in temperature

• Change in state

• Change in size

• Change in shape

What happens to the temperature of a substance during a phase change?

• It increases.

• It decreases.

• It remains constant.

• It fluctuates.

Which of the following best describes the particles in a liquid state?

• Particles are tightly packed and vibrate in place.

• Particles are far apart and move freely.

• Particles are closely packed but can slide past each other.

• Particles are randomly arranged and move quickly.

What is the term for the amount of space that a substance occupies?

• Mass

• Density

• Volume

• Weight