States of Matter, Changing States of Matter, Heat, Heat and

What is density?

• How big a substance is.

• The boiling or freezing points of a substance.

• How much "stuff" fits into a space and how close together that "stuff" is.

• How much electricity can flow through solids, liquids, and gasses.

Which is more dense?

• Cold Water

• Hot water

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What happens in cold water?

• Molecules spread apart and rise.

• Molecules bounce around rapidly.

• Molecules come together and sink.

• Molecules float to the top.

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What happens in warm water?

• Molecules spread apart and rise.

• Molecules come together and sink.

• Molecules vibrate in place.

• Molecules melt as they bounce around.

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NGSS.MS-PS1-4

Which state of matter is this image?

• Solid

• Liquid

• Gas

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Which state of matter is this image?

• Solid

• Liquid

• Gas

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NGSS.MS-PS3-4

Which state of matter is this image?

• Solid

• Liquid

• Gas

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What is a key factor in order for molecules to change from a solid to a liquid or a liquid to a gas?

• Heat

• Sunlight

• Fire

• Density

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is the definition of heat energy?

• Heat energy is the electricity that sparks from warm molecules.

• Heat energy is the measurement of how quickly atoms spin.

• Heat energy is the increased movement of the molecules.

• Heat energy is the decreased movement of the molecules.

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