Question 1

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

Accepted Answer

Ionic bonds involve the transfer of electrons from a metal to a nonmetal, while covalent bonds involve the sharing of electrons between two nonmetals.

Question 2

An atom of sulfur (S) has 16 protons and 18 electrons. What is the symbol and charge of this ion?

Accepted Answer

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

Question 3

What is the correct formula for the ionic compound formed between $$\mathrm{Mg}^{2+}$$ and $$\mathrm{N}^{3-}$$ ions?

Accepted Answer

$$\mathrm{Mg}_3\mathrm{N}_2$$

Question 4

Which of the following compounds is named correctly according to the rules for metals with variable charge?

Accepted Answer

PbS$$_2$$: lead(IV) sulfide

Question 5

What is the name of the ionic compound $$\mathrm{Ca}_3\mathrm{N}_2$$?

Accepted Answer

Calcium nitride

Question 6

Which of the following is a polyatomic ion?

Accepted Answer

$$\mathrm{NO}_3^-$$

Question 7

What is the correct formula for the ionic compound formed between $$\mathrm{Al}^{3+}$$ and $$\mathrm{SO}_4$$^{2-}$$?

Accepted Answer

$$\mathrm{Al}_2\mathrm{(SO}_4)_3$$

Question 8

Which of the following molecules is polar?

Accepted Answer

$$\mathrm{NH}_3$$

Question 9

What is the strongest intermolecular force present in water ($$\mathrm{H}_2\mathrm{O}$$)?

Accepted Answer

Hydrogen bonding

Question 10

Which of the following best describes the electron geometry and molecular shape of $$\mathrm{CH}_4$$?

Accepted Answer

Tetrahedral, tetrahedral

Question 11

A molecule of $$\mathrm{CO}_2$$ has which type of molecular shape and is it polar or nonpolar?

Accepted Answer

Linear, nonpolar

Question 12

Which of the following bonds is considered nonpolar covalent?

Accepted Answer

$$\mathrm{N}-\mathrm{N}$$

Question 13

What is the correct name for the molecular compound $$\mathrm{N}_2\mathrm{O}_5$$?

Accepted Answer

Dinitrogen pentoxide

Question 14

Which of the following ions has the greatest number of electrons?

Accepted Answer

$\mathrm{Cl}^-$$

Question 15

Rank the following compounds from lowest to highest melting point: $$\mathrm{CO}_2$$, $$\mathrm{H}_2\mathrm{O}$$, $$\mathrm{NaCl}.$$

Accepted Answer

$$\mathrm{CO}_2 \u003c \mathrm{H}_2\mathrm{O} \u003c \mathrm{NaCl}$$

Question 16

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

Accepted Answer

A central C atom with four single bonds to four H atoms, no lone pairs on C.

Question 17

Which of the following molecules contains a double bond in its Lewis structure?

Accepted Answer

$$\mathrm{CO}_2$$

Question 18

What is the correct formula for the ionic compound formed between $$\mathrm{Na}^+$$ and $$\mathrm{PO}_4$$^{3-}$$?

Accepted Answer

$$\mathrm{Na}_3\mathrm{PO}_4$$

Question 19

Which of the following best explains why ionic compounds have high melting points?

Accepted Answer

They contain strong electrostatic attractions between oppositely charged ions.

Chapter 6 – Ionic and Molecular Compounds: Structure, Bonding, and Nomenclature

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