Chapter 3: Density Review

How do molecules look in COLD and HOT water?

• Molecules are closer together in cold water and further apart in hot water.

• Molecules are further apart in cold water and closer together in hot water.

• Molecules are evenly spaced in both cold and hot water.

• Molecules move faster in cold water and slower in hot water.

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Which of the following reasons explains WHY two cubes could have a different mass? (Select all that apply.)

• One cube's atoms are bigger.

• One cube's atoms are arranged closer together so there are more.

• A cube's atoms may have a greater atomic mass.

• One's atoms are smaller so more can fit in the cube.

• One's atoms are more spread out meaning they will take up more space in the cube.

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What is the formula for finding the density of a material?

• Density = Mass / Volume

• Density = Volume / Mass

• Density = Mass x Volume

• Density = Mass + Volume

A beaker contains 50 ml of water with a mass of 50 g. What is the density of the oil?

• 1 g/ml

• 1.1 g/ml

• 0.8 g/ml

• 1.0 g/ml

How did the hot water (yellow) move in the cup/jar?

• Sunk to the bottom of the cup/jar.

• Moved to the top of the cup/jar.

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Does hot water have a higher, lower, or the same density than room temperature water?

• Higher Density

• Lower Density

• The SAME density

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When a substance gets warmer, the molecules are CLOSER or FARTHER.

• CLOSER

• FARTHER

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Does cold water have a higher, lower, or the same density than room temperature water?

• Higher Density

• Lower Density

• The SAME density

When a substance gets colder, the molecules are CLOSER or FARTHER.

• CLOSER

• FARTHER

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Things with a HIGH density FLOAT or SINK.

• FLOAT

• SINK