Phase change diagram

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

• solid
• liquid
• gas
• supercritical fluid

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.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.

At 10 atm, dry ice is heated from -100 °C to 30 °C.  What changes occur?

• freezing, then condensation
• melting only
• sublimation only
• melting, then boiling

What is the normal melting point of CO₂ at 1 ATM?

• -78.5 °C

• -56.7 °C

• 31 °C

• It doesn't have a normal melting point.

Tags

NGSS.HS-PS3-4

What is the boiling point of CO₂ at 1 ATM (normal pressure is always 1ATM)?

• -78.5 °C

• -56.7 °C

• 31 °C

• It doesn't have a normal boiling point.

Tags

NGSS.HS-PS3-4

What state of matter is X?

• solid 
• liquid
• gas
• supercritical fluid

What state of matter is Y?

• solid 
• liquid
• gas
• supercritical fluid

Tags

NGSS.MS-PS1-4

What state of matter is Z?

• solid 
• liquid
• gas
• supercritical fluid

What change occurs from F to E?

• sublimation
• deposition
• melting
• condensation