DO NOW: Understanding Changes of State

What happens to the thermal energy of a substance when it changes from a solid to a liquid?

• It decreases.

• It remains the same.

• It increases.

• It disappears.

Tags

NGSS.MS-PS1-4

Which of the following best describes the melting point of a substance?

• The temperature at which a liquid becomes a gas.

• The temperature at which a solid becomes a liquid.

• The temperature at which a gas becomes a solid.

• The temperature at which a liquid becomes a solid.

Tags

NGSS.MS-PS1-4

If the boiling point of water is 100°C, what happens to the water molecules at this temperature?

• They freeze.

• They condense.

• They evaporate.

• They melt.

Tags

NGSS.MS-PS1-4

Which process involves a liquid changing into a gas at a temperature below its boiling point?

• Freezing

• Condensation

• Evaporation

• Melting

Tags

NGSS.MS-PS1-4

What is the term for the temperature at which a liquid turns into a solid?

• Boiling point

• Melting point

• Freezing point

• Evaporation point

During condensation, what happens to the thermal energy of a gas?

• It increases.

• It decreases.

• It remains the same.

• It doubles.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which of the following is an example of vaporization?

• Ice melting into water

• Water boiling into steam

• Steam condensing into water

• Water freezing into ice

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is the relationship between temperature and thermal energy during the melting of ice?

• Temperature decreases, thermal energy increases.

• Temperature increases, thermal energy decreases.

• Both temperature and thermal energy increase.

• Temperature remains constant, thermal energy increases.

Tags

NGSS.MS-PS1-4

Which of the following processes is the reverse of vaporization?

• Melting

• Freezing

• Condensation

• Evaporation

Tags

NGSS.MS-PS1-4

What happens to the temperature of a substance during a phase change, such as melting or boiling?

• It increases.

• It decreases.

• It remains constant.

• It fluctuates.

Tags

NGSS.MS-PS1-4