Question 1

Physical change is a change in the physical properties of a substance such as size or shape. Which of the following is NOT a physical change?

Accepted Answer

Burning a log of wood

Answer

Dissolving sugar in water

Answer

Crushing a can

Answer

Breaking a glass

Question 2

Which of the following is NOT true about chemical change?

Accepted Answer

Chemical and physical properties of the substance are retained after the change.

Answer

Heat is either absorbed or given out during a chemical change.

Answer

A new substance is formed after the change.

Answer

Chemical change is permanent and irreversible.

Question 3

A phase change is a physical process in which a substance goes from one phase to another. When does phase change occur?

Accepted Answer

Heat is added to or removed from the substance.

Answer

A substance is combined with another substance.

Answer

Particles of the substance are not changing their motion.

Answer

Particles of the substance maintain their kinetic energy.

Question 4

Which of the following is NOT a chemical change?

Accepted Answer

chewing a gum

Answer

neutralizing stomach acid with an antacid tablet

Answer

using oxygen in body cells

Answer

formation of green leaves in plants

Question 5

What happens to the particle arrangement of a liquid when it changes to gas?

Accepted Answer

Particles move distant from each other in random motion.

Answer

None of the above

Answer

Particles do not move. Particles are close together with no regular arrangement.

Answer

Particles move close to one another and become ordered.

Question 6

Which is evidence of chemical change?

Accepted Answer

Appearance of new substance

Answer

Drastic change of size

Answer

Formation of new shape

Answer

Increase of temperature

Question 7

What phase change is illustrated in the figure on the right?

Accepted Answer

<P>Melting</P>

Answer

Evaporation

Answer

<P>Freezing</P>

Answer

Condensation

Question 8

A student mixed two clear liquids together. After a few minutes, a white powdery solid was seen and settled at the bottom of the test tube. What conclusion can be made based on the observations cited above?

Accepted Answer

The liquids have gone through a chemical change in which a precipitate was formed.

Answer

The liquids have been stored too long and no longer good.

Answer

The liquids are toxic and should be handled with caution.

Answer

The liquids were pure substances before they were mixed.

Question 9

Refer to the figure on the right. What phase changes are illustrated in A and B?

Accepted Answer

A – Evaporation; B – Condensation

Answer

A – Sublimation; B – Deposition

Answer

A – Condensation; B – Deposition

Answer

A – Fusion; B – Solidification

Question 10

What happens to the particles of a substance after undergoing a chemical change?

Accepted Answer

All of the above

Answer

Bonds between particles of the substances are broken.

Answer

New bonds are formed between particles of the substances.

Answer

Energy is absorbed or released by the particles.

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