Question 1

Which statement best explains why noble gases are generally unreactive?

Accepted Answer

They have a full set of valence electrons, satisfying the octet rule.

Question 2

What is the charge of a sulfide ion formed from a sulfur atom?

Accepted Answer

$$2-$$

Question 3

Which of the following best describes the difference between an ionic and a covalent bond?

Accepted Answer

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.

Question 4

Using the crossover method, what is the correct formula for aluminum oxide?

Accepted Answer

$$\mathrm{Al}_2\mathrm{O}_3$$

Question 5

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

Accepted Answer

Carbon dioxide ($$\mathrm{CO}_2)$$

Question 6

What is the correct Lewis symbol for a sodium ion ($$\mathrm{Na}^+$$)?

Accepted Answer

Na with no dots

Question 7

Which of the following ions is isoelectronic with argon ($$\mathrm{Ar}$$)?

Accepted Answer

$$\mathrm{Cl}^-$$

Question 8

According to the HONC rule, how many covalent bonds does nitrogen typically form?

Accepted Answer

3

Question 9

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

Accepted Answer

$$\mathrm{CaCO}_3$$

Question 10

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

Accepted Answer

Trigonal pyramidal

Question 11

Which of the following is a free radical?

Accepted Answer

$$\mathrm{NO}_2$$

Question 12

What is the correct formula for calcium nitrate?

Accepted Answer

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

Question 13

Which of the following best describes a polar covalent bond?

Accepted Answer

A bond where electrons are shared unequally due to a difference in electronegativity.

Question 14

What is the charge of an ion formed by a group 1A metal?

Accepted Answer

$$1+$$

Question 15

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

Accepted Answer

Iron(III) ion

Question 16

Which of the following molecules has a bent molecular geometry?

Accepted Answer

$$\mathrm{H}_2O$$

Question 17

If a molecule has polar bonds but is symmetric, what is its overall polarity?

Accepted Answer

It is always nonpolar.

Question 18

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

Accepted Answer

A central C atom with four single bonds to H atoms.

Question 19

Which of the following best explains why ionic compounds tend to be crystalline solids?

Accepted Answer

The ions are arranged in a repeating pattern due to strong electrostatic attractions.

Question 20

Which of the following is the correct formula for magnesium bromide using the crossover method?

Accepted Answer

$$\mathrm{MgBr}_2$$

Chemical Bonds: Structure, Types, and Properties (CHEM 110 Study Notes)

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