Investigation 2Part 2: Sinking and Floating Water

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What happens to water when heat is added or taken away?

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The difference between the density of hot water and the density of cold water.

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Denser – the molecules of an object are closer together.

Less Dense – the molecules of an object are not as close together.

Everything in the world is made up of molecules. How close together the molecules are determine the objects density.

I now pronounce that all of you are molecules!

Stand up!

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Sink – an object goes to the bottom of a container of liquid.

Float – an object lays on the top of a liquid.

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What will happen when you drop a rubber stopper in the cup of water?

A wooden bead?

A cork?

A penny?

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If an object floats in water, the object is less dense than water.

If an object sinks in water, the object is denser than water.

Which objects are less densethan water? Which objects are denser than water?

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What do you think will happen if you put hot water in a container of room-temperature water?

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Getters need to get a tray with a small vial, a craft stick, and a rubber band.

Starters will get the cup of water.

The Encourager will assemble the vials on the sticks and practice lowering the empty vial into the cup.

The teacher will fill the vial with hot water that has been dyed red.

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What happened to the hot water in the vials?

Why do you think this happened?

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What do you think will happen if you put cold water in a vial and lower it into a cup of room-temperature water?

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Getters need to get a tray with a small vial, a craft stick, and a rubber band.

Starters will get the cup of water.

The Encourager will assemble the vials on the sticks and lower the cup into the water.

The teacher will fill the vial with cold water that has been dyed blue.

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What happened to the cold water in the vials?

Why do you think this happened?

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Which water was denser than room-temperature water?

Which water was less dense than room-temperature water?

Which is denser, hot water or cold water?

Why do you think so?

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Record your observations on the Sinking and Floating Water worksheet.

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Denser – the molecules of an object are closer together.

Less Dense – the molecules of an object are not as close together.

Everything in the world is made up of molecules. How close together the molecules are determine the objects density.

I now pronounce that all of you are molecules!

Stand up!

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Sink – an object goes to the bottom of a container of liquid.

Float – an object lays on the top of a liquid.

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Is hot water denser or less dense than room-temperature water? How do you know?

Which is denser, hot water or cold water? How do you know?

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