Structure and Properties of Matter

Bill has a piece of chalk that has a mass of 15 grams. He smashed it with a hammer into smaller pieces. He gathered all the pieces up and used a balance to fins the new mass of the chalk. The mass of the chalk ___________.

• increased

• decreased

• stayed the same

• none of the above

Which statement best explains why fruit salad is classified as a mixture?

• The components can be easily separated.

• When heated, a new substance is formed.

• The ingredients will combine to make new matter.

• The physical properties of the components change.

On a warm, sunny afternoon, ocean water splashed onto a rock. A short time later, the rock was dry. Which statement best explains what happened to the water on the rock?

• Salt caused the water to become a gas

• Heat caused the water to become a gas.

• Salt melted the water and it disappeared.

• Heat melted the water and it disappeared.

Taylor put iron filings and sand in a jar. She put a lid on the jar and shook it until the two materials combined, but the materials did not bond together. What did Taylor make?

• mixture

• element

• molecule

• solution

The balance is used to measure __________ .

• mass to the nearest gram

• density to the nearest gram

• length to the nearest centimeter

• weight to the nearest gram

A glass of iced tea is placed on a table. After 10 minutes, there are drops of water on the outside surface of the glass. Which change in phase caused the drops of water?

• Liquid water in the air evaporated into a gas.

• Liquid water in the air condensed into a solid.

• Water vapor from the air evaporated into a liquid.

• Water vapor from the air condensed into a liquid.

Which of the following mixtures would a screen be used to separate the different particles?

• salt and sugar

• water and salt

• sand and rocks

• iron filings and sand

When water changes from solid to liquid to gas, which statement is false?

• The mass increases.

• The mass stays the same.

• The temperature decreases.

• The temperature stays the same.

When Jake breathes out on a cold day, a cloud is formed. Which change occurs that lets Jake see his breath as a cloud?

• liquid changes to solid

• solid changes to a gas

• liquid changes to a gas

• gas changes to a liquid

What two physical properties could best describe a basketball?

• color, shape

• weight, solubility

• size, magnetism

• magnetism, hardness