Pretest

Question 1

Water is made of two hydrogen atoms and one oxygen atom bonded together. Julia is describing how water undergoes a physical change when it boils. She says that the particles shift to be farther apart and that the oxygen and hydrogen separate. She also says that the total mass of the steam is the same as the initial water, and that heat energy was required to cause the change. She finishes her description by saying that the steam can be turned back into water if it is cooled. Which is the mistake in her description?

Revolt · Accepted Answer

A: Atoms remain bonded to each other in physical changes.

Question 2

Eugene describes the physical property of a material as “sweet and floral.” What physical property of the material is Eugene most likely observing?

Revolt · Accepted Answer

B: odor

Question 3

Which statement best compares and contrasts two physical properties of matter?

Revolt · Accepted Answer

D: Boiling points and melting points are similar because they both involve the change in a state of a material, but they are different because boiling point involves a change from a liquid to a gas and melting point involves a change from a solid to a liquid.

Question 4

When liquid gold becomes a solid, its particles get closer together. Which best describes what happened to the gold?

Revolt · Accepted Answer

B: the rearrangement of particles in a physical change

Question 5

Serena is mixing a material into a beaker filled with a liquid. She notices that the material seems to disappear into the liquid. What physical property of the material is Serena most likely observing?

Revolt · Accepted Answer

B: solubility

Question 6

What happens when a substance undergoes a physical change?

Revolt · Accepted Answer

B: Some physical properties change, but the substance keeps its identity.

Question 7

Which is the property of matter in which a substance can transfer heat or electricity?

Revolt · Accepted Answer

B: conductivity

Question 8

Which can occur in a physical change?

Revolt · Accepted Answer

B: The particles can arrange in different ways.

Question 9

What is an example of a physical change?

Revolt · Accepted Answer

A: ice forming and then melting back into water

Question 10

Which statement about the physical change of liquid water boiling into steam is true?

Revolt · Accepted Answer

B: The heat added represents an energy change.

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