Question 1

Which of the following best describes why compounds form between atoms?

Accepted Answer

To achieve a noble gas electronic configuration for each atom involved.

Question 2

Which of the following statements correctly distinguishes between ionic and covalent bonding?

Accepted Answer

Ionic bonding involves a complete transfer of electrons from a metal to a non-metal, while covalent bonding involves sharing electrons between two non-metals.

Question 3

Which of the following is the correct Lewis structure for the cyanide ion ($$\mathrm{CN^-}$$)?

Accepted Answer

A triple bond between C and N, with a lone pair on each atom and an extra electron for the negative charge.

Question 4

A molecule of carbon dioxide ($$\mathrm{CO_2$}) is $$nonpolar even though it contains polar bonds. Why?

Accepted Answer

The bond dipoles cancel each other due to the linear geometry of the molecule.

Question 5

Which of the following molecules is expected to have a trigonal planar molecular geometry?

Accepted Answer

$$\mathrm{BF_3$}$$

Question 6

What is the bond angle in a molecule with a tetrahedral electronic geometry?

Accepted Answer

$$109.5^\circ$$

Question 7

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

Accepted Answer

Polar, because the molecule is tetrahedral but the peripheral atoms are not all identical.

Question 8

Which of the following pairs of elements would form a bond with the greatest ionic character?

Accepted Answer

Sodium (Na) and Fluorine (F)

Question 9

Given the following electronegativity values: F = 4.0, P = 2.1, Si = 1.8. Arrange these elements in order of increasing electronegativity.

Accepted Answer

Si \u003c P \u003c F

Question 10

Which of the following is the correct name for the compound $$\mathrm{N_2O_5}$$?

Accepted Answer

Dinitrogen pentoxide

Question 11

A molecule has three charge clouds around its central atom, one of which is a lone pair. What is its molecular geometry and approximate bond angle?

Accepted Answer

Bent, $$\u003c120^\circ$$

Question 12

Which of the following statements about the Lewis structure of $$\mathrm{O_3$} ($$ozone) is correct?

Accepted Answer

It has resonance structures with one double bond and one single bond distributed between the oxygen atoms.

Question 13

Which of the following best explains why water ($$\mathrm{H_2O}) is a $$polar molecule?

Accepted Answer

It has polar O–H bonds and a bent molecular geometry, so the bond dipoles do not cancel.

Question 14

Which of the following is the correct formula for a compound named sulfur hexafluoride?

Accepted Answer

$$\mathrm{SF_6$}$$

Question 15

A student is asked to draw the Lewis structure for $$\mathrm{NO_3$^-} ($$nitrate ion). How many total valence electrons should be used?

Accepted Answer

24

Question 16

Which of the following molecules is isoelectronic with $$\mathrm{CO_2$}$$?

Accepted Answer

$$\mathrm{CS_2$}$$

Question 17

Which of the following best describes the bond in $$\mathrm{HCl}$$?

Accepted Answer

Polar covalent

Question 18

Which of the following is NOT a property of molecular compounds?

Accepted Answer

Aqueous solutions conduct electricity.

Question 19

A molecule has four charge clouds around the central atom, two of which are lone pairs. What is the molecular geometry?

Accepted Answer

Bent

Question 20

Which of the following best describes the trend in electronegativity across a period in the periodic table?

Accepted Answer

Electronegativity increases from left to right across a period.

Chapter 4: Molecular Compounds – Structure, Bonding, and Properties

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