Phase Diagrams

What happens when thermal energy is taken away from particles?

• They move faster and farther apart
• They move slower and closer together

Tags

NGSS.MS-PS1-4

During a phase change, the temperature

• increases
• decreases
• fluctuates
• stays the same

Tags

NGSS.MS-PS1-4

What is the normal boiling point of this substance? (Diagram C)

• 150 °C

• 100 °C

• -50 °C

• 0 °C

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

What is the normal melting point of this substance? (Diagram C)

• 150 °C

• 100 °C

• -50 °C

• 0 °C

Tags

NGSS.MS-PS1-4

Water exists as a _____________ at 700 mmHg and 50 °C.

• solid
• liquid
• gas
• supercritical fluid

Tags

NGSS.MS-PS1-4

What phase change(s) may occur at pressures below 4.58 mmHg?

• sublimation/deposition
• melting/freezing
• all phase changes are possible at these pressures
• vaporization/condensation

Tags

NGSS.MS-PS1-4

The pressure is increased on a sample of water at 0 °C from 0 mmHg to 800 mmHg.  In order, what changes occur?

• deposition, melting
• sublimation, melting
• condensation, freezing
• deposition, freezing

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Based on this phase diagram, which state is the most dense?

• gas
• solid
• liquid
• solid and liquid have equal densities

Based on its phase diagram, which is the most dense state for CO₂?

• gas
• liquid
• solid
• supercritical fluid

What is true regarding CO₂ for temperatures above 31 °C?

• It can never be liquified.
• It decomposes.
• It has a high pressure.
• It is a plasma.

Tags

NGSS.MS-PS1-4