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Physical states of matter
Class 9 · Chemistry · 6 questions
Name: ____________________ Date: ____________
Which state of matter has a fixed shape and a fixed volume?
- A Gas
- B Solid
- C Liquid
- D Plasma
The change of a solid directly into a gas is called:
- A Condensation
- B Sublimation
- C Melting
- D Freezing
At the same temperature, which gas diffuses the fastest?
- A Carbon dioxide
- B Oxygen
- C Hydrogen
- D Chlorine
Boyle's law says that at constant temperature the volume of a gas is inversely proportional to its:
- A Pressure
- B Colour
- C Mass
- D Density only
Evaporation takes place:
- A Only in a vacuum
- B At any temperature, from the surface
- C Only at the boiling point
- D 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?
- A 4 L
- B 2 L
- C 8 L
- D 1 L
Answer key
1. B, 2. B, 3. C, 4. A, 5. B, 6. B
Particles in a solid are held in fixed positions.
Sublimation is solid to gas without passing through the liquid state.
Lighter molecules move faster. Hydrogen is the lightest.
At constant temperature, P V is constant.
Evaporation happens at the surface of a liquid at any temperature.
P1 V1 = P2 V2, so V2 = 2 x 4 / 4 = 2 L.