Liquid Oxygen Reading Questions Amplify Phase Change

What definition for molecular attraction would be most correct?

• The force that pulls molecules of the same substance together.

• The force that causes molecules of a gas to fly away.

• The force that magnetic substances have to pull other substances.

• The force that causes substances to have more kinetic energy.

Why is it more likely to see liquid water than liquid oxygen?

The molecules of water have ​ (a)   molecular attraction between them, and the molecules of oxygen have ​ (b)   .

• more
• less

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Why do the molecules of liquids and solids stay together?

• The level of attraction between molecules of these phases is greater than their kinetic energy.

• The level of attraction between molecules of these phases is less than their kinetic energy.

• The level of attraction between molecules of these phases is equal to their kinetic energy.

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Why are gas molecules able to move away from each other?

• The kinetic energy of gas molecules overcomes the attraction between molecules.

• The attraction between gas molecules is too strong for kinetic energy to hold them together.

• Gas molecules are hot.

• Gas molecules don't have any attraction between them.

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Does the molecular attraction of a substance ever change?

The two forces are in a “tug of war” to determine what phase a substance is in are ​ (a)   and ​ (b)   . ​ (c)   drives molecules together, and ​ (d)   drives molecules apart.

• molecular attraction
• kinetic energy

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In the article it says “A large increase in kinetic energy can move molecules so fast that they overcome the pull of attraction and move away from each other”. If this happened to a liquid, what phase would it become and why?

• A solid, because kinetic energy makes molecules able to come together.

• A solid, because kinetic energy makes molecules able to spread further apart.

• A gas, because kinetic energy makes molecules able to spread further apart.

• A gas, because kinetic energy makes molecules able to come closer together.

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It also says “A large decrease in kinetic energy allows attraction to overcome kinetic energy and pull the molecules toward each other.” If this happened to a liquid, what phase would it become and why?

• A gas, because decreasing kinetic energy pulls molecules further apart.

• A gas, because decreasing kinetic energy pushes molecules closer together.

• A solid, because decreasing kinetic energy pulls molecules further apart.

• A solid, because decreasing kinetic energy pushes molecules closer together.

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What temperature does oxygen need to be in order to condense it into a liquid? Why?

• Very cold, because oxygen's molecular attraction is very weak, and it can only become gas when it doesn't have much kinetic energy.

• Very cold, because oxygen molecules need more kinetic energy to become liquid.

• Very cold, because oxygen's molecular attraction is too strong to be a gas while warm.

• Very cold, because oxygen has a lower condensing point than water.

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