13.4-Changes of State - 1

Water returns to the air as a gas through _____.

• Condensation

• Freezing

• Evaporation

• Melting

The change of a substance from a solid to a vapor without passing through the liquid state is called _____.

• Deposition

• Sublimation

• Condensation

• Evaporation

Sublimation occurs in solids with ____ that exceed atmospheric pressure at or near room temperature.

• Low density

• High boiling points

• Vapor pressures

• Low energy

A substance that undergoes sublimation and changes into a purple vapor without passing through a liquid state is _____.

• Sulfur

• Iodine

• Carbon

• Ice

Sublimation is a process in which a substance changes directly from _____ without becoming a liquid.

• Liquid to Gas

• Solid to Gas

• Gas to Solid

• Liquid to Solid

If freshly brewed coffee is frozen and the water vapor is removed with a vacuum pump, the result is _____ coffee.

• Instant

• Freeze-Dried

• Filtered

• Blended

The solid carbon dioxide often used as a coolant, which sublimes instead of melting, is called _____.

• Ice

• Liquid Nitrogen

• Dry Ice

• Solid Oxygen

Dry ice has a low temperature of _____.

• -10°C

• -50°C

• -100°C

• -78°C

The _____ contain substances that sublime at room temperature.

• Perfumes

• Solid Air Fresheners

• Deodorants

• Liquid Fresheners

The _____ use sublimation to separate mixtures and to purify compounds.

• Biologists

• Organic Chemists

• Physicists

• Engineers