Question 1

Which of the following compounds contains both ionic and covalent bonds?

Accepted Answer

Sodium nitrate, $$\mathrm{$$NaNO_3$$}$$

Question 2

Which of the following correctly describes the electron geometry and approximate bond angle of ammonia ($$\mathrm{NH_3$}$$)?

Accepted Answer

Tetrahedral electron geometry, bond angle $$\approx 109.5^\circ$$

Question 3

Which of the following molecules is nonpolar, despite having polar bonds?

Accepted Answer

Carbon dioxide, $$\mathrm{CO_2$}$$

Question 4

A patient is given an intravenous solution containing $$\mathrm{NaCl}$$ and $$\mathrm{KCl}. $$Which of the following best explains why these salts dissolve readily in water?

Accepted Answer

Water is polar and stabilizes the ions through ion-dipole interactions.

Question 5

Which of the following molecules can form hydrogen bonds with water?

Accepted Answer

Methanol, $$\mathrm{CH_3OH}$$

Question 6

Which of the following correctly ranks the boiling points of the compounds from lowest to highest?

Accepted Answer

$$\mathrm{CH_4$} \u003c \mathrm{CH_3Cl} \u003c \mathrm{CH_3OH}$$

Question 7

Which of the following best describes the bonding in $$\mathrm{O_2$}$$?

Accepted Answer

A double covalent bond between two oxygen atoms

Question 8

Which of the following statements about electronegativity is correct?

Accepted Answer

Electronegativity increases across a period and decreases down a group.

Question 9

A molecule has the following Lewis structure: $$\mathrm{H-O-H}. $$Which of the following statements is true?

Accepted Answer

The molecule is bent with a bond angle of approximately $$104.5^\circ.$$

Question 10

Which of the following best explains why oil does not dissolve in water?

Accepted Answer

Oil is nonpolar and hydrophobic, while water is polar and hydrophilic.

Question 11

Which of the following is the correct name for $$\mathrm{Fe_2$(SO_4$)_3}$$?

Accepted Answer

Iron(III) sulfate

Question 12

How many valence electrons are present in a molecule of $$\mathrm{C_2H_4} ($$ethene)?

Accepted Answer

16

Question 13

Which of the following molecules has a trigonal planar shape?

Accepted Answer

Boron trifluoride, $$\mathrm{BF_3$}$$

Question 14

Which of the following best describes the intermolecular forces present in liquid nitrogen ($$\mathrm{N_2$}$$)?

Accepted Answer

Dispersion forces only

Question 15

Which of the following compounds is most soluble in hexane ($$\mathrm{C_6H_{14}}$$)?

Accepted Answer

Octane, $$\mathrm{C_8H_{18}}$$

Question 16

Which of the following statements about polyatomic ions is correct?

Accepted Answer

The sulfate ion, $$\mathrm{SO_4$^{2-}}$$, contains covalent bonds between sulfur and oxygen.

Question 17

A molecule has the following condensed formula: $$\mathrm{CH_3CH_2OH}. $$Which of the following is true?

Accepted Answer

It can form hydrogen bonds with water.

Question 18

Which of the following best describes the polarity of a molecule of $$\mathrm{CH_2Cl_2} ($$dichloromethane)?

Accepted Answer

The molecule is polar because the dipoles do not cancel.

Question 19

Which of the following best explains why $$\mathrm{H_2O}$$ has a higher boiling point than $$\mathrm{H_2S}$$?

Accepted Answer

$$\mathrm{H_2O}$$ forms hydrogen bonds, which are stronger than the dipole-dipole forces in $$\mathrm{H_2S}.$$

Question 20

Which of the following is the correct formula for dinitrogen pentoxide?

Accepted Answer

$$\mathrm{N_2O_5}$$

Ionic and Covalent Compounds, Molecular Geometry, and Intermolecular Forces: Study Guide

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