Phase Changes and Heat Curves

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.HS-PS3-4

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.HS-PS3-4

What would happen to the liquid substance if the pressure were decreased until a phase change occurred? It would undergo...

• melting
• vaporization
• condensation
• sublimation

What is the normal boiling point of this substance?

• 150 °C
• 100 °C
• -50 °C
• 0 °C

What is the normal melting point of this substance?

• 150 °C
• 100 °C
• -50 °C
• 0 °C

Tags

NGSS.HS-PS1-3

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

• solid
• liquid
• gas
• supercritical fluid

Tags

NGSS.HS-ESS2-5

Water exists as a _____________ at 3 mmHg and 50 °C.

• solid
• liquid
• gas
• supercritical fluid

Tags

NGSS.HS-PS3-4

Above the temperature and pressure of point B, this substance exists as a ____________.

• solid
• liquid
• gas
• supercritical fluid

Tags

NGSS.HS-PS3-4

What would happen if the gaseous substance with a pressure of 10^-3 atmospheres were cooled until a phase change occurred?

• condensation

• vaporization

• sublimation

• deposition

What line segment represents only the solid state?

• A-B

• B-C

• C-D

• D-E

Tags

NGSS.MS-PS1-4