SAT Subject Test Chemistry,10 edition

(A) 0.67

(B) 2

(C) 3

(D) 6

5 . Given that the molecular weight of ethyl alcohol, CH 3 CH 2 OH, is 46, and that of water is 18,
how many grams of ethyl alcohol must be mixed with 100 mL of water for the mole
fraction (X) of ethyl alcohol to be 0.2?

    g

6 . Which of the following will be the most electrically conductive?

(A) Sugar   dissolved   in  water

(B) Salt    water

(C) Salt    dissolved   in  an  organic solvent

(D) An  oil and water   mixture

7 . A semipermeable membrane separates a container of fresh water from one of salt water.
If the volume of fresh water decreases significantly, what must be true of the
semipermeable membrane? Assume that evaporation is negligible.

8 . Once equilibrium is reached, if the temperature in question 7 is suddenly increased, the
osmotic pressure

(A) will    decrease

(B) will    increase

(C) will    remain  the same

(D) cannot  be  determined