Question 1

Which of the following best explains why chemical bonds form between atoms?

Accepted Answer

To minimize the potential energy and increase stability

Question 2

Which statement about bond formation and bond breaking is correct?

Accepted Answer

Bond formation is exothermic and bond breaking is endothermic

Question 3

Which of the following compounds would you expect to have the highest lattice energy?

Accepted Answer

CaO

Question 4

According to Coulomb’s law, which factor has the greatest effect on the magnitude of lattice energy in an ionic compound?

Accepted Answer

The charge of the ions

Question 5

Which of the following best describes a polar covalent bond?

Accepted Answer

Electrons are shared unequally between two atoms

Question 6

Which of the following is a correct empirical formula for a compound containing 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 7

A sample of a hydrate of magnesium sulfate has a mass of 5.06 g before heating and 2.47 g after heating to remove all water. What is the formula of the hydrate?

Accepted Answer

$$\mathrm{$$MgSO_4$$ \cdot 7H_2O}$$

Question 8

Which of the following is the correct name for $$\mathrm{Fe_2$(SO_4$)_3}$$?

Accepted Answer

Iron(III) sulfate

Question 9

Which of the following is a property of ionic compounds but not molecular compounds?

Accepted Answer

They conduct electricity when molten

Question 10

What is the molar mass of $$\mathrm{Al_2$(SO_4$)_3}$$? (Use: Al = 26.98 g/mol, S = 32.07 g/mol, O = 16.00 g/mol)

Accepted Answer

$$\mathrm{342.17\ g/mol}$$

Question 11

A 1.00 g sample of an alkaline-earth-metal chloride is treated with excess AgNO$$_3$$ and produces 1.38 g of AgCl. What is the identity of the metal?

Accepted Answer

Barium

Question 12

Which of the following is the correct formula for ammonium sulfite?

Accepted Answer

$$\mathrm{(NH_4$)_2SO_3}$$

Question 13

Which of the following is a binary acid?

Accepted Answer

Hydrochloric acid ($$\mathrm{HCl(aq)})$$

Question 14

A compound is found to contain 29.4% calcium, 23.5% sulfur, and 47.1% oxygen by mass. What is the empirical formula?

Accepted Answer

$$\mathrm{$$CaSO_4$$}$$

Question 15

Which of the following best describes the difference between a molecular formula and an empirical formula?

Accepted Answer

The empirical formula shows the simplest ratio of atoms, while the molecular formula shows the actual number of atoms

Question 16

Which of the following is the correct name for $$\mathrm{Cu(NO_3$)_2}$$?

Accepted Answer

Copper(II) nitrate

Question 17

A 0.3546-g sample of vanadium metal is heated in air and reacts with oxygen to achieve a final mass of 0.6330 g. What is the empirical formula of the vanadium oxide formed?

Accepted Answer

$$\mathrm{V_2O_5}$$

Question 18

Which of the following is a correct name for $$\mathrm{H_2SO_3}$$?

Accepted Answer

Sulfurous acid

Question 19

Which of the following best describes the structure of an ionic solid like NaCl?

Accepted Answer

A 3-D lattice of alternating cations and anions

Question 20

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

Accepted Answer

$$\mathrm{Fe_2$(Cr_2O_7)_3}$$

Chemical Bonding, Compounds, and Formulas: Foundations of General Chemistry

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