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Gases - Test 2


1. 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.


2. Which of the following is not a general property of gases?

    A. They mix homogeneously unless they react.
    B. When molecules collide with each other, there is no loss of energy in the gas.
    C. They are always clear and colorless.
    D. The molecular attraction between the molecules is less than it is for liquids and solids.


3. Boyle's law says:

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


4. A gas can be most easily liquefied if it has:

    A. low forces of intermolecular attraction
    B. high forces of intermolecular attraction
    C. molecules of large size
    D. molecules of small size


5. Which of the following gases is the most nearly ideal?

    A. CO
    B. NO
    C. O2
    D. ICl


6. 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


7. Experimental evidence that a gas consists mostly of empty space is:

    A. the density of a gas becomes greater when it is liquefied.
    B. gases exert pressure on the walls of their containers.
    C. gases are transparent
    D. heating a gas increases molecular motion


8. 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


9. 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


10. Of the following, the element most reactive with oxygen is:

    A. Si
    B. P
    C. S
    D. Cl












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