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مادے کی طبعی حالتیں

نویں جماعت · کیمیا · 6 سوالات

نام: ____________________   تاریخ: ____________

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

    • A Gas
    • B Solid
    • C Liquid
    • D Plasma

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

    • A Condensation
    • B Sublimation
    • C Melting
    • D Freezing

  3. At the same temperature, which gas diffuses the fastest?

    • A Carbon dioxide
    • B Oxygen
    • C Hydrogen
    • D Chlorine

  4. 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

  5. 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

  6. 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

جوابی کلید

1. B, 2. B, 3. C, 4. A, 5. B, 6. B

  1. Particles in a solid are held in fixed positions.

  2. Sublimation is solid to gas without passing through the liquid state.

  3. Lighter molecules move faster. Hydrogen is the lightest.

  4. At constant temperature, P V is constant.

  5. Evaporation happens at the surface of a liquid at any temperature.

  6. P1 V1 = P2 V2, so V2 = 2 x 4 / 4 = 2 L.