Liquid Oxygen

1. How is liquid oxygen different from liquid water?

• Liquid water is a plasma

• Liquid oxygen is difficult to produce

• Liquid water is more rare

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1. Why is it difficult for scientists to produce liquid oxygen?

• The attraction that pulls the oxygen molecules toward hydrogen must overcome their kinetic energy.

• The kinetic energy that pulls the oxygen molecules toward each other must overcome the attraction that pulls them away from each other.

• The attraction that pulls the oxygen molecules toward each other must overcome the kinetic energy that pulls them away from each other.

• Oxygen is Ohio

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1. What is molecular attraction?

• Electricity and magnetism in electrical circuits

• Every substance has a certain level of attraction between its molecules that pulls the planets toward each other.

• Every molecule has an attraction toward kinetic energy.

• Every substance has a certain level of attraction between its molecules that pulls the molecules toward each other.

1. Does the molecular attraction of a substance change?

• Only on Thursday

• It never changes

• It changes when kinetic energy is added or taken away.

• It changes when electrons are added or taken away.

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1. Why do molecules stay close together in liquids and solids?

• Because of the attraction between the molecules

• Because of kinetic energy

• Because of electron shells.

• They don't stay close together.

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1. Why do molecules move away from each other in a gas?

• Because they have a lot of molecular attraction.

• Because they are sigma.

• Because the torque and revolutions are high energy.

• Because they have a lot of kinetic energy.

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1. What is the relationship between molecular attraction and kinetic energy?

• As the molecular attraction goes up, the kinetic energy also goes up.

• They play a tug of war that impacts the temperature

• They play a tug of war that impacts the motion of molecules.

• They play a tug of war that impacts the weather

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Substance A is a gas and Substance B is a liquid. They are at the same temperature. Why is one a gas and one a liquid?

• Substance B is in a grid, but substance A is in a diamond structure.

• Substance B has weaker attraction, and enough energy to overcome the attraction between the molecules and fly apart. Substance A has a stronger attraction, and not enough energy to overcome the attraction between the molecules, so its molecules stay together.

• Substance A has stronger attraction and substance B has stronger kinetic energy.

• Substance A has weaker attraction, and enough energy to overcome the attraction between the molecules and fly apart. Substance B has a stronger attraction, and not enough energy to overcome the attraction between the molecules, so its molecules stay together.

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1. What process do scientists use to produce liquid oxygen? List the three steps. 

• 3 Tanks -

  1. Using air, lower molecular attraction and drain off liquid water

  2. Heat above

  -183°C (-297.4°F) to create a vapor

  3. Cool it down just a little so the nitrogen solidifies

• 3 Tanks -

  1. Using air, lower temperature and drain off liquid water

  2. Cool below

  -183°C (-297.4°F) to create a liquid

  3. Heat it up just a little so the nitrogen evaporates

• 3 Tanks -

  1. Using air, lower temperature and drain off liquid nitrogen

  2. Cool below

  -183°C (-297.4°F) to create a solid

  3. Heat it up just a little so the nitrogen sublimates

• 3 Tanks -

  1. Using water, lower temperature and drain off liquid water

  2. Cool below

  -183°C (-297.4°F) to create a solid

  3. Heat it up just a little so the nitrogen evaporates

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NGSS.MS-PS1-4

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1. How are hydrogen and methane similar to oxygen?

• Cows produce them

• They can become vapor on Mars.

• They can become liquid if cooled to 0º F.

• They can become liquid if cooled to extremely cold temperatures.