Physical states of matter

Which state of matter has a fixed shape and a fixed volume?

• 1 Gas
• 2 Solid
• 3 Liquid
• 4 Plasma

The change of a solid directly into a gas is called:

• 1 Condensation
• 2 Sublimation
• 3 Melting
• 4 Freezing

At the same temperature, which gas diffuses the fastest?

• 1 Carbon dioxide
• 2 Oxygen
• 3 Hydrogen
• 4 Chlorine

Boyle's law says that at constant temperature the volume of a gas is inversely proportional to its:

• 1 Pressure
• 2 Colour
• 3 Mass
• 4 Density only

Evaporation takes place:

• 1 Only in a vacuum
• 2 At any temperature, from the surface
• 3 Only at the boiling point
• 4 Only in solids

A gas at 2 atm pressure has a volume of 4 L. At constant temperature, what is the volume at 4 atm?

• 1 4 L
• 2 2 L
• 3 8 L
• 4 1 L

Gas pressure is caused by:

• 1 Weight of the gas only
• 2 Heat only
• 3 Collisions of gas molecules with the walls
• 4 Colour

The process of a gas turning into a liquid is:

• 1 Condensation
• 2 Sublimation
• 3 Melting
• 4 Evaporation

Which state has the lowest density?

• 1 Gas
• 2 Liquid
• 3 Solid
• 4 All equal

Diffusion is fastest in:

• 1 Gases
• 2 All equal
• 3 Solids
• 4 Liquids