9. Solutions

Which of the following statements is/are true?

I. The hydrocarbon methane (CH₄) will dissolve completely in acetone (CH₃COCH₃).

II. Ammonia (NH₃) will form a heterogeneous mixture with carbon tetrachloride (CCl₄).

III. Pentane (C₅H₁₂) will form a homogeneous mixture with carbon tetrabromide (CBr₄).

IV. Methanethiol (CH₃SH) is miscible in fluoromethane (CH₃F).

Which of the following pairs of substances would you expect to form solutions?

a. CCl₄ and water

b. Benzene (C₆H₆) and MgSO₄

c. Hexane (C₆H₁₄) and heptane (C₇H₁₆)

d. Ethyl alcohol (C₂H₅OH) and heptanol (C₇H₁₅OH)

Describe the formation of an aqueous KI solution, when solid KI dissolves in water.

Water is a polar solvent and carbon tetrachloride (CCl₄) is a nonpolar solvent. In which solvent is each of the following, which is found or used in the body, more likely to be soluble?

d. cholesterol (lipid), nonpolar

Why does water not dissolve motor oil?

Match the diagrams with the following:

b. a nonpolar solute and a polar solvent

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Match the diagrams (1 or 2) with the following: (9.1)

b. a nonpolar solute and a polar solvent

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