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Gases - Test 1


1. Gases show abnormally large compressibility:

    A. at ordinary temperatures upon moderate increases in pressure
    B. at very large increases in pressure
    C. because the molecules occupy a definite volume
    D. because of the tendency of molecules to repel each other


2. If both the volume and the absolute temperature of a gas were tripled, the pressure would be:

    A. unchanged
    B. three times as great
    C. six times as great
    D. nine times as great


3. The vapor pressure of a liquid:

    A. is the pressure at which its pressure is equal to that of the atmosphere:
    B. decreases more rapidly with temperature as the temperature falls
    C. is the pressure necessary to cause bubble formation at atmospheric pressure
    D. is the pressure at which the rate of evaporation is equal to the rate of condensation


4. Methane:

    A. is formed when hydrogen is discharged at a graphite cathode
    B. is the principal constituent of natural gas
    C. requires 3X its own volume of O2 for combustion
    D. is the simplest branched-chain hydrocarbon


5. Which one of the following would not affect the volume of a single gas in a rubber balloon?

    A. chemical composition of the gas
    B. temperature of the gas
    C. pressure of the gas
    D. altitude of the balloon


6. Temperature refers to:

    A. the quantity of molecules present.
    B. the total potential energy of the molecules.
    C. the average kinetic energy of the molecules.
    D. the total caloric content of the individual molecules.


7. Boyle's law says:

    A. P/V=k
    B. V/P=k
    C. V=k/P
    D. V=kP


8. When pumping air into a tire, we notice the wall of the pump becomes warm to the touch, because:

    A. the air being taken in is warmer than the air in the tire
    B. some of the mechanical energy of pumping is converted to heat
    C. the air molecules have increased their frictional drag
    D. warm air rushes back into the pump from the tire


9. When air from a compressed air tank expands, the air is reduced in temperature mainly because:

    A. convection takes place
    B. work is done at the expense of heat energy
    C. air is a good conductor of heat
    D. expansion increases the degree of molecular freedom


10. Nitrogen:

    A. forms one of the most stable diatomic molecules known
    B. is used in the space above the mercury in thermometers because it liquefies at a very low tem
    C. forms nitrites when heated with nearly all metals
    D. forms ammonia when heated to an extremely high temperature in the presence of platinum






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