Phase Changes, Freedom of Movement and Kinetic Energy

What would be a reason for a phase change to occur in one substance and not another substance even if both substances began at the same phase and were transferred the same amount of energy?

• The molecular attraction of one of the substances was weaker than the other substance causing phase change to occur.

• The molecular attraction of both substances were the same causing phase change to occur in one of them.

• The molecular attraction of one of the substances was stronger than the other substance causing phase change to occur.

• Phase change can not occur in one substance and not the other because they both started in the same phase.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-2

NGSS.MS-PS3-4

In order to increase the speed of a substance's molecules, someone must...

• transfer energy into the substance.

• transfer energy out of the substance.

• lower the temperature of the substance.

• keep the temperature the same for the substance.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

If you have a liquid that changes to a gas, explain it's freedom of movement in both phases.

• molecules move away from each other, then around each other

• molecules move in place, then around each other

• molecules move around each other, then away from each other

• molecules move around each other, then in place

Tags

NGSS.MS-PS1-4

If you transfer energy out of a substance how will the movement of the molecules change?

• molecules will move faster

• molecules will move slower

• molecules will stop moving

• molecules do not move

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

You have two substances at room temperature. Both substances are a liquid. You transfer the same amount of energy out of both substances but only one substance changes phase. What happened?

• the substance with the weaker attraction will change to a gas

• the substance with the stronger attraction will turn to a solid

• the substance with the stronger attraction will turn to a gas

• the substance with the weaker attraction will turn to a solid

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What happens to molecules when their kinetic energy increases?

• It depends on the molecules

• they move faster

• they move slower

• they stay the same

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which options are correct about molecular attraction and freedom of movement?

• High molecular attraction = High freedom of movement

• Low molecular attraction = Low freedom of movement

• Low molecular attraction = High freedom of movement

• These two vocabulary words have nothing to do with each other.

Tags

NGSS.MS-PS1-4

When a substance melts, the kinetic energy _____________.

• decreases

• stays the same

• increases

• decreases then increases

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What happens to particles when they are heated?

• They speed up and spread out

• They slow down and compress

• They stop moving

• They move closer together and speed up

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

You have dropped your popsicle and are watching it become a LIQUID. Which answer BEST explains what PHASE CHANGE has occurred AND how the molecule MOVEMENT has changed?

• The PHASE CHANGE that has occurred is CONDENSATION and the molecule MOVEMENT has become FASTER.

• The PHASE CHANGE that has occurred is EVAPORATION and the molecule MOVEMENT has become SLOWER.

• The PHASE CHANGE that has occurred is MELTNG and the molecule MOVEMENT has become FASTER.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5