Unit 2 MC Exam Practice

What is the term for the temperature at which a liquid turns into a gas at standard pressure?

• Freezing point

• Boiling point

• Sublimation point

• Triple point

Which phase change occurs when a solid turns directly into a gas?

• Condensation

• Sublimation

• Deposition

• Melting

Tags

NGSS.MS-PS3-4

On a heating curve, which segment represents the phase where temperature remains constant while energy is used to change the phase?

• Sloped segments

• Flat segments

• The initial segment

• The final segment

What is the triple point on a phase diagram?

• The point where only the solid phase exists

• The point where solid, liquid, and gas phases coexist

• The point where the substance is supercritical

• The point where only the liquid phase exists

Which process requires energy to be absorbed by the substance?

• Freezing

• Condensation

• Melting

• Deposition

Tags

NGSS.MS-PS1-4

What does the critical point on a phase diagram represent?

• The temperature and pressure where a substance can exist as a solid

• The temperature and pressure above which the liquid and gas phases are indistinguishable

• The temperature and pressure where only the gas phase exists

• The temperature and pressure where only the liquid phase exists

Tags

NGSS.HS-PS3-4

Which segment of a heating curve corresponds to the liquid phase?

• The segment after the melting plateau and before the boiling plateau

• The segment before the melting plateau

• The segment after the boiling plateau

• The segment during the melting plateau

A sample of gas at 2 atm and 3 L is compressed to 1 L at constant temperature. What is the new pressure according to Boyle’s Law?

• 1 atm

• 3 atm

• 6 atm

• 4 atm

Which phase change is represented by the flat segment between the solid and liquid phases on a heating curve?

• Freezing

• Melting

• Vaporization

• Condensation

Tags

NGSS.MS-PS1-4

If a substance is at its boiling point, what happens to the temperature as it continues to absorb heat?

• It increases rapidly

• It remains constant

• It decreases

• It fluctuates