Question 1

Which statement best explains why noble gases such as neon and argon are chemically inert?

Accepted Answer

They have a full octet of electrons in their outermost shell, making them stable.

Question 2

What is the correct Lewis (electron-dot) symbol for the oxygen atom?

Accepted Answer

O with six dots arranged around it

Question 3

When sodium reacts with chlorine to form sodium chloride, what type of bond is formed?

Accepted Answer

Ionic bond

Question 4

Which of the following is the correct formula for magnesium oxide?

Accepted Answer

$$\mathrm{MgO}$$

Question 5

What is the charge on the chloride ion?

Accepted Answer

$$-1$$

Question 6

Which of the following compounds contains a polyatomic ion and requires parentheses in its formula?

Accepted Answer

$$\mathrm{Ca(NO_3$)_2}$$

Question 7

Which of the following is the correct name for $$\mathrm{NH_4_2SO_4}$$?

Accepted Answer

Ammonium sulfate

Question 8

Which statement correctly describes a covalent bond?

Accepted Answer

A covalent bond is formed when two atoms share a pair of electrons.

Question 9

What is the correct name for $$\mathrm{P_2O_3}$$?

Accepted Answer

Diphosphorus trioxide

Question 10

Which of the following best describes the difference between ionic and covalent compounds?

Accepted Answer

Ionic compounds are formed from the transfer of electrons, while covalent compounds are formed from the sharing of electrons.

Question 11

Which of the following bonds is most likely to be polar covalent?

Accepted Answer

H—Cl

Question 12

Given the electronegativity difference between two atoms is $$1.2$$, what type of bond is most likely formed?

Accepted Answer

Polar covalent

Question 13

Which of the following is a correct guideline for drawing Lewis structures?

Accepted Answer

Count the total number of valence electrons and distribute them to satisfy the octet rule.

Question 14

Which molecule is a free radical?

Accepted Answer

$$\mathrm{NO}$$

Question 15

According to VSEPR theory, what is the molecular shape of $$\mathrm{CH_4$}$$?

Accepted Answer

Tetrahedral

Question 16

Which condition must be met for a molecule to be polar?

Accepted Answer

It must have polar bonds arranged so that a separation of charge exists.

Question 17

What is the correct formula for calcium nitrate?

Accepted Answer

$$\mathrm{Ca(NO_3$)_2}$$

Question 18

Which of the following ions is a polyatomic ion?

Accepted Answer

$$\mathrm{SO_4$^{2-}}$$

Question 19

A molecule has polar bonds but is symmetrical in shape. What can be said about its overall polarity?

Accepted Answer

It is likely nonpolar because the dipoles cancel out.

Question 20

Which of the following is the correct name for $$\mathrm{Fe$$^{3+}$$}$$?

Accepted Answer

Iron(III) ion

Chemical Bonds: Structure, Types, and Properties

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