Question 1

Which of the following statements best explains why water (H$$_2O) is $$considered a compound and not a mixture?

Accepted Answer

Water is composed of hydrogen and oxygen atoms in a fixed, definite proportion.

Question 2

Which type of chemical bond is formed when electrons are transferred from a metal to a nonmetal?

Accepted Answer

Ionic bond

Question 3

What is the empirical formula for glucose, C$$_6H$_{12}O$_6$$?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 4

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

Accepted Answer

Molecular compounds contain highly directional covalent bonds, forming molecules, while ionic compounds contain nondirectional ionic bonds, forming lattices.

Question 5

Which of the following metals forms only one type of cation in its compounds?

Accepted Answer

Sr

Question 6

What is the correct name for the compound FeCl$$_3$$?

Accepted Answer

Iron(III) chloride

Question 7

Which of the following is a polyatomic ion?

Accepted Answer

NO$$_3^-$$

Question 8

What is the correct name for the compound Na$$_2SO$_4$$·10H$$_2O$$?

Accepted Answer

Sodium sulfate decahydrate

Question 9

Which of the following formulas represents a molecular element?

Accepted Answer

$$\mathrm{O_2$}$$

Question 10

What is the correct name for the acid H$$_2SO$_3$$?

Accepted Answer

Sulfurous acid

Question 11

A compound is found to contain 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is its empirical formula?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 12

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

Accepted Answer

$$\mathrm{N_2O_5}$$

Question 13

Which of the following statements about organic compounds is correct?

Accepted Answer

Organic compounds are primarily composed of carbon and hydrogen, sometimes with O, N, S, and other elements.

Question 14

What is the molar mass of water ($$\mathrm{H_2O}$$)? (Atomic masses: H = 1.01 g/mol, O = 16.00 g/mol)

Accepted Answer

18.02 g/mol

Question 15

Which of the following best describes a structural formula?

Accepted Answer

It uses lines to represent covalent bonds and shows how atoms are connected.

Question 16

Which of the following is the correct name for the compound P$$_2O$_5$$?

Accepted Answer

Diphosphorus pentoxide

Question 17

Which of the following is a correct ratio that can be derived from the molecular formula of water ($$\mathrm{H_2O}$$)?

Accepted Answer

2 mol H : 1 mol O

Question 18

Which of the following is the correct name for the compound CuSO$$_4$$·5H$$_2O$$?

Accepted Answer

Copper(II) sulfate pentahydrate

Question 19

Which of the following is the correct formula for acetic acid?

Accepted Answer

$$\mathrm{CH_3COOH}$$

Question 20

Which of the following best describes a hydrocarbon?

Accepted Answer

A compound containing only carbon and hydrogen.

Molecules and Compounds: Structure, Bonding, and Nomenclature

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