$$\dfrac{16.00}{2 \times 1.01 + 16.00} \times 100 \approx 88.8\%$$

Question 1

Which statement best describes an ionic bond?

Accepted Answer

It is a chemical bond formed by the electrostatic attraction between positive cations and negative anions.

Question 2

What is the correct formula for calcium oxide?

Accepted Answer

$$\mathrm{CaO}$$

Question 3

Which of the following compounds is named correctly according to binary ionic nomenclature?

Accepted Answer

$$\mathrm{NaCl}$$: sodium chloride

Question 4

The magnitude of lattice energy ($$LE) $$for an ionic compound is given by Coulomb's Law. Which equation correctly represents this relationship?

Accepted Answer

$$LE = \dfrac{Q_1$ Q_2$}{r}$$

Question 5

Which of the following is a correct empirical formula?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 6

A molecule of $$\mathrm{H_2O}$$ contains how many atoms?

Accepted Answer

3

Question 7

Which of the following is a polyatomic ion?

Accepted Answer

$$\mathrm{CO_3$^{2-}}$$

Question 8

What is the name of the compound $$\mathrm{Fe_2O_3}$$?

Accepted Answer

Iron(III) oxide

Question 9

Which of the following is a correct molecular formula for dinitrogen pentoxide?

Accepted Answer

$$\mathrm{N_2O_5}$$

Question 10

How many oxygen atoms are present in 1 mole of $$\mathrm{Ca(NO_3$)_2}$$?

Accepted Answer

6 moles of oxygen atoms

Question 11

Which of the following is the correct name for $$\mathrm{NH_4$^+}$$?

Accepted Answer

Ammonium ion

Question 12

What is the percent by mass of oxygen in $$\mathrm{H_2O}$$? (Atomic masses: H = 1.01, O = 16.00)

Accepted Answer

$$\dfrac{16.00}{2 	imes 1.01 + 16.00} 	imes 100 \approx 88.8\%$$

Question 13

Which of the following is a correct name for $$\mathrm{$$HClO_3$$}$$?

Accepted Answer

Chloric acid

Question 14

Which of the following is a homonuclear diatomic molecule?

Accepted Answer

$$\mathrm{O_2$}$$

Question 15

What is the correct formula for ammonium phosphate?

Accepted Answer

$$\mathrm{(NH_4$)_3PO_4}$$

Question 16

Which of the following statements about the Law of Definite Proportions is correct?

Accepted Answer

A compound always contains the same elements in the same fixed ratio by mass.

Question 17

What is the name of $$\mathrm{$$CuSO_4$$ \cdot 5H_2O}$$?

Accepted Answer

Copper(II) sulfate pentahydrate

Question 18

Which of the following is the correct formula for iron(III) sulfate?

Accepted Answer

$$\mathrm{Fe_2$(SO_4$)_3}$$

Question 19

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

Accepted Answer

Dinitrogen pentoxide

Question 20

Which of the following is the correct formula for barium hydroxide?

Accepted Answer

$$\mathrm{Ba(OH)_2}$$

Ionic and Covalent Compounds: Structure, Nomenclature, and Formulas

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