How does the temperature of a substance relate to its density?

• A warmer substance will be less dense, because the atoms are expanding.

• A warmer substance will be more dense, because the atoms are contracting.

• A cooler substance will be less dense, because the atoms are expanding.

• There is no relationship between the temperature and density of a substance.

Tags

NGSS.MS-PS1-4

This diagram shows the particles that make up three different substances.

What state of matter does Substance 2 most likely exhibit?

• solid

• liquid

• gas

• plasma

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The table shows the times and temperatures for a solid substance being heated on a stove.

If the substance melts at 200°F, at which time did the particles in the substance move the slowest?

• 1 min.

• 2 min.

• 4 min.

• 6 min.

Tags

NGSS.MS-PS1-4

Which factor is most important for determining the phase in which a substance exists?

• Its mass

• Its density

• Its volume

• Its temperature

Tags

NGSS.MS-PS1-4

Scientists are observing molecules by using an advanced electron microscope. They notice the molecules are beginning to move faster and expanding. What is most likely happening?

• Heat is being added, and a gas is turning into a liquid.

• Heat is being added, and a solid is turning into a liquid.

• Heat is being removed, and a gas is turning into a solid.

• Heat is being removed, and a liquid is turning into a solid.

Tags

NGSS.MS-PS1-4

How are the temperature of a substance and the movement of atoms in a substance related?

• When the temperature increases, the movement of atoms decreases.

• When the temperature decreases, the movement of atoms increases.

• When the temperature decreases, the movement of atoms decreases.

• When the temperature decreases, the movement of atoms is unchanged.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

A helium balloon is taken outside on a very cold day. The balloon wrinkles and becomes a little smaller. Why does the balloon deflate when it exposed to the cold air?

• The colder temperature causes the gas in the balloon to expand because the particles are moving farther apart.

• The colder temperature causes the gas in the balloon to contract because the particles are moving closer together.

• The colder temperature causes the gas in the balloon to escape.

• The colder temperature causes more gas to enter the balloon, and it expands.

Tags

NGSS.MS-PS1-4

Which statement best explains the relationship between temperature and the kinetic energy of atoms?

• As temperature increases, the kinetic energy increases.

• As temperature decreases, the kinetic energy increases.

• As temperature increases, the kinetic energy converts into potential energy.

• As temperature decreases, the kinetic energy converts into potential energy.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The diagram compares the movement of water particles when the water is cold compared to when it is hot.

What happens to the particles in the cold water?

• The particles in the cold water contract and move more slowly

• The particles in the cold water expand move more quickly.

• The particles in the cold water move more freely.

• The particles in the cold water do not move at all.

Tags

NGSS.MS-PS1-4

What will most likely occur if water is cooled until it becomes solid ice?

• The particles of water will speed up and expand.

• The particles of water will slow down and contract.

• The particles of water will not change speed.

• The particles of water will stop moving completely.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-5