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5Points Quiz

One of these is not part of the procedure in determining the critical temperature of a liquid.

        A.  Heat the set up system gradually

        B.  Fill an evacuated capillary tube up with the liquid and seal up

        C.  Select and evacuate a capillary tube that is able to withstand high pressure

        D.  Place the filled capillary tube in ice block and observe

Answer: D

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One of these statements is untrue about semiconductors.

        A.  They are insulators under normal conditions

        B.  They conduct under normal conditions

        C.  They conduct when heated

        D.  Electrical conductivity increases with temperature

Answer: B

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One of these statements is not true of the kinetic-molecular theory of gases.

        A.  Individual gas molecules are relatively far apart

        B.  The actual volume of the gas molecules themselves is very small compared to the volume occupied by the gas at ordinary temperatures and pressures

        C.  The average kinetic energies of different gases are different at the same temperature

        D.  There is no net gain or loss of the total kinetic energy in collisions between gas molecules

Answer: C

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In a closed container a liquid in equilibrium with its vapour:

        A.  The rate at which molecules from the liquid phase enter the gas phase exactly equals the rate at which molecules from the gas phase pass into the liquid phase

        B.  A change in temperature will not change the pressure in the container

        C.  The amount of gas in the container must exactly equal the amount of liquid

        D.  Molecules cannot go from the liquid phase to the gas phase because the amount of liquid in the container is constant

Answer: A

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Which of these statements is true of mixtures?

        A.  Mixtures always contain a fixed proportion of elements by mass

        B.  Very little or no exchange of energy occurs during the formation of mixtures

        C.  A mixture cannot be easily separated into its constituents

        D.  A mixtures can only be separated into its constituents by chemical methods

Answer: B

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In filtration, the term residue refers to

        A.  the solid that remains on the filter paper

        B.  the liquid that drains through the filter paper

        C.  the type of filter paper used

        D.  the mixture before separation

Answer: A

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Fractional distillation can be used to:

        A.  Separate the component of crude oil

        B.  Separate the components of coal

        C.  Separate rice from sand

        D.  Common salt from iodine

Answer: A

For More Quiz Questions click here to download Global Quiz on Google PlayStore


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