Unit 2: Matter

The diagram below shows a tall beaker with four different liquids and their densities.

If a ball that has a density of 1.73 g/cm³ is placed in the beaker, where will the ball come to rest?

• On top of liquid A

• Between liquids B and C

• Between liquids C and D

• On the bottom of the beaker

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NGSS.MS-PS1-2

A scientist uses an instrument to observe the pattern of molecules in a substance. The picture below shows what the scientist sees.

What state of matter is the scientist most likely observing?

• Gas

• Liquid

• Vapor

• Solid

A pond is pictured below in two different seasons.

Which of the following has caused the changes in the pond from A to B?

• The pond water has lost heat energy.

• The pond water temperature has increased.

• Warm water has risen to the top of the pond.

• All of the water has evaporated from the pond.

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NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which statement correctly describes both gases and liquids?

• Their shapes stay the same in any container.

• Their shapes changes when they are in different containers.

• Their volumes stay the same in any container.

• Their volumes changes when they are in different containers.

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?

• Heat caused the water to become a gas.

• Heat melted the water and it disappeared.

• Salt caused the water to become a gas.

• Salt melted the water and it disappeared.

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NGSS.MS-PS1-4

The picture shows the melting of an ice cube.

The ice cube changed because it

• Cooled

• Warmed

• Hardened

• Evaporated

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NGSS.MS-PS1-4

A glass of ice water 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.

Alex placed a small beaker of cold water on a hot plate and heated it for 10 minutes. He took the temperature of the water several times during those 10 minutes and recorded his data. Alex claims that the graph shows the relationship between temperature and time when water is heated.

Which statement best explains why the temperature leveled off in section 2 of the graph?

• Alex turned off the hot plate so the water did not get any warmer.

• The water reached the boiling point, so the temperature no longer increased.

• An experimental error caused the graph to level off, because the water temperature should keep increasing over time.

• Cold water heats faster than warm water, so once the cold water was room temperature, it took more than 10 minutes to make it hot.

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

In which example is matter changing state?

• heating a pan of water until the water is gone

• putting a soft drink can in the refrigerator to cool it

• heating soup on the stove until it is hot to your tongue

• transferring sugar into a storage container

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

Bromine (Br) is a liquid at room temperature. Oxygen (O) is a gas at room temperature. Room temperature is 25°C.

Which of the following statements is true?

• The boiling point of oxygen is colder than room temperature.

• The boiling point of bromine is colder than room temperature.

• The melting point of oxygen is warmer than room temperature.

• The melting point of bromine is warmer than room temperature.

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NGSS.MS-PS1-4