Question 1

Which of the following best describes the difference between an ionic compound and a molecular compound?

Accepted Answer

Ionic compounds are formed by transferring electrons from metals to nonmetals, while molecular compounds are formed by sharing electrons between nonmetals.

Question 2

Which of the following is the correct empirical formula for hydrogen peroxide, given its molecular formula is $\mathrm{H_2O_2}$?

Accepted Answer

$\mathrm{HO}$

Question 3

A sample contains 24.5 g of nitrogen and reacts with oxygen to form 94.5 g of a nitrogen oxide. What is the empirical formula of the nitrogen oxide?

Accepted Answer

$\mathrm{NO_2}$

Question 4

Which of the following compounds is an example of a molecular element?

Accepted Answer

O$_2$

Question 5

What is the correct name for the compound $\mathrm{Fe_2O_3}$ using the Stock system?

Accepted Answer

Iron(III) oxide

Question 6

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

Accepted Answer

$\mathrm{MgS_2O_3}$

Question 7

How many molecules are present in 4.5 g of sulfur trioxide ($\mathrm{SO_3}$)? (Molar mass of SO$_3$ = 80.07 g/mol, Avogadro's number = $6.022 	imes 10^{23}$ molecules/mol)

Accepted Answer

$3.38 	imes 10^{22}$

Question 8

Which of the following is the correct name for $\mathrm{N_2O_4}$?

Accepted Answer

Dinitrogen tetroxide

Question 9

What is the percent composition by mass of sodium in sodium carbonate ($\mathrm{Na_2CO_3}$)? (Atomic masses: Na = 22.99, C = 12.01, O = 16.00)

Accepted Answer

43.4%

Question 10

Which of the following best describes the process of forming an ionic bond between sodium and chlorine?

Accepted Answer

Sodium loses an electron to become Na$^+$, chlorine gains an electron to become Cl$^-$, and the oppositely charged ions attract.

Question 11

What is the correct formula for the compound formed between aluminum ions and phosphate ions?

Accepted Answer

$\mathrm{AlPO_4}$

Question 12

A compound is found to contain 92.2% carbon and 7.8% hydrogen by mass. What is its empirical formula?

Accepted Answer

$\mathrm{CH}$

Question 13

Which of the following is the correct name for $\mathrm{HNO_2}$ (aq)?

Accepted Answer

Nitrous acid

Question 14

What is the molar mass of sodium sulfate ($\mathrm{Na_2SO_4}$)? (Atomic masses: Na = 22.99, S = 32.07, O = 16.00)

Accepted Answer

142.05 g/mol

Question 15

Which of the following is the correct formula for copper(II) sulfite?

Accepted Answer

$\mathrm{CuSO_3}$

Question 16

A 4.24 g sample containing only C, H, and O is burned to produce 6.21 g CO$_2$ and 2.54 g H$_2$O. What is the mass percent of carbon in the sample? (Molar mass CO$_2$ = 44.01 g/mol, C = 12.01 g/mol)

Accepted Answer

44.1%

Question 17

Which of the following is the correct name for $\mathrm{P_4S_{10}}$?

Accepted Answer

Tetraphosphorus decasulfide

Question 18

What is the molecular formula of a compound with an empirical formula of $\mathrm{CH_2O}$ and a molar mass of 180.2 g/mol? (Empirical formula mass = 30.03 g/mol)

Accepted Answer

$\mathrm{C_6H_{12}O_6}$

Question 19

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

Accepted Answer

$\mathrm{(NH_4)_2Cr_2O_7}$

Molecules and Compounds: Structure, Nomenclature, and Calculations

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