Liquid Oxygen (Amplify Lesson 3.1)

What color is liquid oxygen?

• Dark green

• Transparent

• Pale blue

• Bright red

Why is liquid oxygen rare compared to oxygen gas?

• It is a synthetic substance made in laboratories

• It requires high temperatures to produce

• It is only found deep underground

• It requires removal of a lot of kinetic energy to produce

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is the role of molecular attraction in changing the phase of a substance?

• It increases the kinetic energy of the molecules

• It is responsible for the temperature of the substance

• It pulls molecules toward each other

• It determines the color of the substance

Tags

NGSS.MS-PS1-4

What must be overcome for oxygen gas to change into liquid oxygen?

• The electrical charge of the molecules

• The pressure of the atmosphere

• The gravitational pull of the Earth

• The kinetic energy of the molecules

Tags

NGSS.HS-PS3-4

How do scientists produce liquid oxygen from air?

• By adding chemicals to the air

• By heating the air to very high temperatures

• By separating oxygen molecules at different temperatures

• By pressurizing the air in a container

What temperature is required to cool gases in the second tank to produce liquid oxygen?

• 0°C (32°F)

• -183°C (-297.4°F)

• -100°C (-148°F)

• -273°C (-459.4°F)

Tags

NGSS.HS-PS3-4

Why do substances like hydrogen and methane also require extreme cooling to become liquid?

• Because of their high molecular weight

• Because of their strong molecular attraction

• Because of their weak molecular attraction

• Because they are naturally occurring gases

Tags

NGSS.HS-PS3-4

What happens in the third tank of the machine used to produce liquid oxygen?

• Water vapor is removed from the air

• Oxygen is frozen into a solid state

• The temperature is increased slightly to evaporate nitrogen

• Nitrogen is added to the mixture

Tags

NGSS.MS-PS1-4

Why can't you find puddles of liquid oxygen on the ground?

• Because it is absorbed by the soil

• Because it evaporates too quickly

• Because it reacts with the sunlight

• Because it requires very cold temperatures to exist

What is the main reason liquid oxygen is not commonly found like water?

• It is illegal to produce liquid oxygen

• Oxygen molecules aren't strongly attracted to each other

• It is too expensive to produce

• It is harmful to the environment