SRA #2

How can substance 2 that is formed in the procedure be classified?

• Substance 2 is a mixture that is separated from a pure substance because of its unique boiling point
• Substance 2 is a mixture that is separated from a pure substance because of its large particle size
• Substance 2 is a pure substance that is separated from a mixture because of its unique boiling point
• Substance 2 is a pure substance that is separated from a mixture because of its large particle size

At what point on the phase diagram does carbon dioxide exist as a solid, liquid, and gas?

• point W
• point X
• point Y
• point Z

How can carbon dioxide in a solid state be changed to a gas?

• Increase the temperature, or increase the pressure.
• Increase the temperature, or lower the pressure.
• Lower the temperature, and lower the pressure.
• Lower the temperature, and increase the pressure.

What can be interpreted from the model?

• When the temperature decreases to -195.8°C, the spaces between the nitrogen molecules decrease, and the gas changes to a liquid
• When the temperature decreases to -195.8°C, the spaces between the nitrogen molecules increase, and the gas changes to a solid
• When the temperature increases to 25°C, the spaces between the nitrogen molecules increase, and the gas changes to a liquid
• When the temperature increases to 25°C, the spaces between the nitrogen molecules decrease, and the gas changes to a solid

A substance has a melting point of -38.8°C and a boiling point of 356.7°C. In what phase is this substance at 150°C?

• gas
• liquid
• plasma
• solid

Which substance has the weakest intermolecular forces between particles?

• table salt
• liquid water
• helium gas
• copper solid

How do particles of a substance change when melting from a solid to a liquid?

• The particles grow larger in size as the temperature increases.
• The particles collide with and move past one another.
• The particles lose energy and move randomly within a container.
• The particles break up into separate groups of particles that vibrate in place.

Which model can be used to describe the particle arrangement of the gas before and after the pressure is applied if there is no phase change?

• A
• B
• C
• D

Which phase is best represented by the diagram?

• solid
• plasm
• liquid
• gas

Using points R and S, what changes in temperature and pressure will cause the substance in the gas phase to become a liquid?

• Increase the temperature, and increase the pressure to change from a gas at point S to a liquid at point R
• Increase the temperature, and decrease the pressure to change from a gas at point S to a liquid at point R
• Decrease the temperature, and increase the pressure to change from a gas at point R to a liquid at point S
• Decrease the temperature, and decrease the pressure to change from a gas at point R to a liquid at point S