Chemistry Review

When water vapor condenses

• Water vapor changes from a liquid to a gas

• One oxygen and two hydrogen atoms join to form a water molecule

• Water vapor changes from a gas to a liquid

• The water molecules spread further apart

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Cooling water vapor makes it condense faster because

• Cooling the vapor causes the molecules to get further apart

• The molecules slow down and their attractions bring them closer together

• Colder temperatures speeds up the molecules

• Water vapor is less dense than liquid water

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When water freezes, liquid water turns to solid ice mainly because

• The water molecules get harder

• The molecules move slowly enough that their attractions keep them in fixed positions

• All liquid water eventually becomes ice

• Ice can float on water

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Different liquids have different freezing points mainly because

• Freezers are at different temperatures

• Some winters are colder than others

• The less liquid you use, the faster it freezes

• Molecules of different liquids have a different amount of attraction 

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Ice melts to become liquid water mainly because

• The water molecules move fast enough to break out of their fixed positions

• Water molecules slow down so much that they melt

• Water molecules react with oxygen to produce melting

• Ice is less dense than water

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If you compare ice and liquid water on the molecular level, you could say that

• The molecules in liquid water are closer together

• The molecules in ice are closer together

• The molecules in ice slide past each other

• The molecules in liquid water are smaller

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When fast-moving atoms or molecules hit slower-moving atoms or molecules and increase their speed, energy is transferred. The energy that is transferred is called heat.

• True

• False

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True or false? Adding energy has no effect on the rate of evaporation. 

• True

• False

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True or false? The molecules in liquid water are closer together than they are in ice. 

• True

• False

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When water molecules in the air slow down so much that their attractions overcome their speed, they join together forming liquid water. This is a description of:

• evaporation

• condensation

• sublimation

• deposition

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