Energy and Phase Changes

What happens to molecules as temperature and energy increase?

• Matter condenses

• Substances expand when heated

• Atoms become less active

• Phase change slows down

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Alex noticed that a metal door that sticks on hot days does not stick when it cools off at night. This is because the metal contracts as it cools. The reason for this is that, as the metal cools, the atoms

• become smaller and take up less space.

• slow down and move closer together.

• merge together to form fewer atoms.

• speed up and move farther apart.

Tags

NGSS.MS-PS1-4

When heat energy and temperature are at their lowest, what state of matter is a substance in?

• Gas

• Vapor

• Solid

• Liquid

Tags

NGSS.MS-PS1-4

When a gas begins to condense through condensation, what happens to the heat in the particles.

• The heat leaves the gas as it condenses.

• The heat goes into the gas as it condenses.

• The heat stays the same as it condenses.

• None of the above.

Tags

NGSS.MS-PS1-4

A substance is able to flow freely within a container. What state of matter is the substance in?

• Liquid

• Gas

• Solid

• Plasma

Why do atoms in a solid still vibrate?

• All solids have some thermal energy.

• Some solids have some thermal energy, and some do not.

• Atoms in a solid do not vibrate.

• None of the above.

Tags

NGSS.MS-PS1-4

Gas to liquid

• Melting

• Freezing

• Condensation

• Vaporization

• Sublimation

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Liquid to gas

• Melting

• Freezing

• Condensation

• Vaporization

• Sublimation

Tags

NGSS.MS-PS1-4

Solid to gas

• Deposition

• Freezing

• Sublimation

• Vaporization

Tags

NGSS.MS-PS1-4

When thermal energy is added to liquids they -

• Melt and change to a solid

• Condense and change to a gas

• Vaporize and change to a gas

• Freeze and change to a solid

Tags

NGSS.MS-PS1-4