Question 1

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons between two nonmetal atoms.

Question 2

Which of the following molecules contains a triple bond?

Accepted Answer

N$$_2$$

Question 3

According to the octet rule, how many covalent bonds does oxygen typically form?

Accepted Answer

Two

Question 4

Which of the following statements about molecular compounds is TRUE?

Accepted Answer

They are often gases, liquids, or low-melting-point solids.

Question 5

What is the molecular geometry of ammonia (NH$$_3) $$according to VSEPR theory?

Accepted Answer

Trigonal pyramidal

Question 6

Which of the following best explains why water (H$$_2O) is a $$polar molecule?

Accepted Answer

It has polar bonds and a bent molecular geometry, resulting in a net dipole moment.

Question 7

Which element is the most electronegative?

Accepted Answer

Fluorine

Question 8

What is the correct name for the compound SF$$_6$$?

Accepted Answer

Sulfur hexafluoride

Question 9

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

Accepted Answer

CO$$_2$$

Question 10

A coordinate covalent bond is best described as:

Accepted Answer

A bond where both electrons in the shared pair come from the same atom.

Question 11

Which of the following is a correct Lewis structure for methane (CH$$_4$$)?

Accepted Answer

C with four single bonds to H atoms and no lone pairs on C.

Question 12

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

Accepted Answer

Electronegativity decreases down a group and increases across a period.

Question 13

Which of the following compounds contains a coordinate covalent bond?

Accepted Answer

NH$$_4^+ ($$ammonium ion)

Question 14

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

Accepted Answer

N$$_2O$_4$$

Question 15

Which molecule has a bond angle closest to 109.5$$^\circ$$?

Accepted Answer

CH$$_4$$

Question 16

Which of the following best explains why ionic compounds have higher melting points than molecular compounds?

Accepted Answer

Ionic compounds have strong electrostatic attractions between ions.

Question 17

Which of the following is the correct name for PCl$$_5$$?

Accepted Answer

Phosphorus pentachloride

Question 18

Which of the following molecules is expected to be linear according to VSEPR theory?

Accepted Answer

CO$$_2$$

Question 19

Which of the following statements about Lewis structures is FALSE?

Accepted Answer

Lewis structures always show the three-dimensional shape of a molecule.

Question 20

Which of the following best describes the bond in HCl?

Accepted Answer

Polar covalent

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

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