Question 1

According to the theory of 'likes dissolves likes', which of the following pairs is most likely to form a homogeneous solution?

Accepted Answer

Methanol ($$\mathrm{CH_3OH}) $$and ethanol ($$\mathrm{C_2H_5OH})$$

Question 2

Which intermolecular force is primarily responsible for the solubility of methanol ($$\mathrm{CH_3OH}) in $$water?

Accepted Answer

Hydrogen bonding

Question 3

Which of the following compounds would NOT be expected to dissolve in water?

Accepted Answer

Methane ($$\mathrm{CH_4$})$$

Question 4

Which statement best explains why pentane ($$\mathrm{C_5H_{12}}) $$forms a homogeneous mixture with bromine ($$\mathrm{Br_2$}$$)?

Accepted Answer

Both are nonpolar and interact via London dispersion forces.

Question 5

Which of the following mixtures is most likely to be heterogeneous?

Accepted Answer

Hexane ($$\mathrm{C_6H_{14}}) $$and water

Question 6

Which of the following best describes the intermolecular forces present in a solution of acetone ($$\mathrm{CH_3COCH_3}) $$and water?

Accepted Answer

Hydrogen bonding and dipole-dipole interactions

Question 7

A student mixes $$\mathrm{$$CCl_4$$} ($$carbon tetrachloride) and $$\mathrm{H_2O} ($$water). What is the expected result?

Accepted Answer

A heterogeneous mixture forms because $$\mathrm{$$CCl_4$$} is $$nonpolar and water is polar.

Question 8

Which of the following statements about hydrogen bonding is TRUE?

Accepted Answer

Hydrogen bonding requires hydrogen to be bonded to highly electronegative atoms like N, O, or F.

Question 9

Which compound would be most soluble in hexane ($$\mathrm{C_6H_{14}}$$)?

Accepted Answer

Octane ($$\mathrm{C_8H_{18}})$$

Question 10

Which of the following best explains why methane ($$\mathrm{CH_4$}) is $$soluble in acetone ($$\mathrm{CH_3COCH_3}$$)?

Accepted Answer

Both are nonpolar and interact via London dispersion forces.

Question 11

Which of the following pairs will NOT form a solution due to differences in polarity?

Accepted Answer

Hydrogen fluoride ($$\mathrm{HF}) $$and hexane ($$\mathrm{C_6H_{14}})$$

Question 12

Which of the following is a correct statement about London dispersion forces?

Accepted Answer

They are present in all molecules, but are the only force in nonpolar molecules.

Question 13

Which of the following mixtures would be expected to form a solution due to hydrogen bonding?

Accepted Answer

Methanol ($$\mathrm{CH_3OH}) $$and water

Question 14

Which of the following best describes the solubility of fluoroethane ($$\mathrm{CH_3CH_2F}) in $$water?

Accepted Answer

It is moderately soluble due to dipole-dipole interactions.

Question 15

Which of the following statements is TRUE regarding the solubility of ionic compounds in water?

Accepted Answer

Ionic compounds dissolve in water due to ion-dipole interactions.

Question 16

Which of the following best explains why $$\mathrm{CH_3SH} ($$methanethiol) is miscible in $$\mathrm{CH_3F} ($$fluoromethane)?

Accepted Answer

Both are polar and can form dipole-dipole interactions.

Question 17

Which of the following is a correct application of the 'likes dissolves likes' principle?

Accepted Answer

Polar solutes dissolve best in polar solvents.

Question 18

Which of the following would be the best solvent for iodine ($$\mathrm{I_2$}$$), a nonpolar molecule?

Accepted Answer

Hexane ($$\mathrm{C_6H_{14}})$$

Question 19

Which of the following pairs will form a solution due to dipole-dipole interactions?

Accepted Answer

Acetone ($$\mathrm{CH_3COCH_3}) $$and chloroform ($$\mathrm{$$CHCl_3$$})$$

Question 20

Which of the following is the best explanation for why $$\mathrm{HF} ($$hydrogen fluoride) and $$\mathrm{CH_3CH_2OH} ($$ethanol) form a solution?

Accepted Answer

Both can form hydrogen bonds with each other.

Intermolecular Forces and Solubility in GOB Chemistry

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