Q: What is the formula mass of carbon dioxide (CO$$_2$$)? (Atomic masses: C = 12.01 amu, O = 16.00 amu)

$$12.01 + 2 \times 16.00 = 44.01$$ amu

Question 1

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

Accepted Answer

Water molecules always contain two hydrogen atoms for every one oxygen atom.

Question 2

Which of the following 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 nonmetals.

Question 3

Which of the following is the correct empirical formula for hydrogen peroxide (H$$_2O$_2$$)?

Accepted Answer

$$\mathrm{HO}$$

Question 4

A sample contains only diatomic molecules of a single element. Which of the following substances fits this description?

Accepted Answer

Oxygen (O$$_2)$$

Question 5

Which of the following is the correct name for the compound FeCl$$_3$$?

Accepted Answer

Iron(III) chloride

Question 6

What is the formula mass of carbon dioxide (CO$$_2$$)? (Atomic masses: C = 12.01 amu, O = 16.00 amu)

Accepted Answer

$$12.01 + 2 	imes 16.00 = 44.01$$ amu

Question 7

Which of the following compounds is a molecular compound?

Accepted Answer

CO$$_2$$

Question 8

What is the correct name for the acid H$$_2SO$_4$$?

Accepted Answer

Sulfuric acid

Question 9

A compound is found to contain 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is its empirical formula? (Atomic masses: C = 12.01, H = 1.01, O = 16.00)

Accepted Answer

$$\mathrm{CH_2O}$$

Question 10

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

Accepted Answer

Dinitrogen pentoxide

Question 11

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

Accepted Answer

A molecular formula shows the actual number of atoms in a molecule, while an empirical formula shows the simplest whole-number ratio of atoms.

Question 12

Which of the following is the correct formula for magnesium nitrate?

Accepted Answer

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

Question 13

A hydrate of copper(II) sulfate has the formula CuSO$$_4$$·5H$$_2O. $$What is the correct name for this compound?

Accepted Answer

Copper(II) sulfate pentahydrate

Question 14

Which of the following is a polyatomic ion?

Accepted Answer

$$\mathrm{NO_3$^-}$$

Question 15

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

Accepted Answer

Diphosphorus pentoxide

Question 16

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

Accepted Answer

$$\mathrm{(NH_4$)_2SO_4}$$

Question 17

Which of the following best describes why carbon can form such a wide variety of compounds?

Accepted Answer

Carbon can form four covalent bonds, including single, double, and triple bonds, and can bond with itself to form chains and rings.

Question 18

Which of the following is the correct name for HNO$$_2$$?

Accepted Answer

Nitrous acid

Question 19

A compound is found to have the empirical formula CH$$_2O $$and a molar mass of 180 g/mol. What is its molecular formula?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$}$$

Question 20

Which of the following is the correct name for the hydrocarbon C$$_3H$_8$$?

Accepted Answer

Propane

Molecules and Compounds: Structure, Types, and Nomenclature

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