Question 1

Which of the following best describes the law of definite proportions as it applies to chemical compounds?

Accepted Answer

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

Question 2

Which of the following is the correct empirical formula for glucose, C$_6$H$_{12}$O$_6$?

Accepted Answer

$CH_2O$

Question 3

A sample of an unknown compound contains 0.21 mol of zinc, 0.14 mol of phosphorus, and 0.56 mol of oxygen. What is its empirical formula?

Accepted Answer

$Zn_3P_2O_8$

Question 4

Which of the following compounds has the highest lattice energy based on the charges and ionic radii of its ions?

Accepted Answer

$MgO$

Question 5

What is the correct name for the compound Fe$_2$(SO$_4$)$_3$?

Accepted Answer

Iron(III) sulfate

Question 6

Which of the following is the correct formula for potassium nitride?

Accepted Answer

$K_3N$

Question 7

A 10.00 g sample of CO$_2$ contains how many moles of CO$_2$? (Molar mass of CO$_2$ = 44.01 g/mol)

Accepted Answer

$0.2272$ mol

Question 8

Which of the following is the correct name for the compound N$_2$O$_4$?

Accepted Answer

Dinitrogen tetroxide

Question 9

What is the percent by mass of lithium in lithium carbonate, Li$_2$CO$_3$? (Atomic masses: Li = 6.941, C = 12.01, O = 16.00)

Accepted Answer

$18.79\%$

Question 10

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

Accepted Answer

$Ba(C_2H_3O_2)_2$

Question 11

Which of the following is the correct name for HClO$_3$?

Accepted Answer

Chloric acid

Question 12

A hydrate of copper(II) sulfate contains five water molecules per formula unit. What is its correct formula?

Accepted Answer

$CuSO_4 \cdot 5H_2O$

Question 13

Which of the following is the correct molecular formula for a compound with an empirical formula of CH$_2$ and a molar mass of 42.12 g/mol? (Empirical formula mass = 14.03 g/mol)

Accepted Answer

$C_3H_6$

Question 14

Which of the following is the correct name for the polyatomic ion $NO_3^-$?

Accepted Answer

Nitrate

Question 15

What is the formula mass of lithium hydroxide, LiOH? (Atomic masses: Li = 6.941, O = 16.00, H = 1.008)

Accepted Answer

$23.95$ amu

Question 16

Which of the following is the correct name for the compound Al(OH)$_3$?

Accepted Answer

Aluminum hydroxide

Question 17

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

Accepted Answer

$N_2O_5$

Question 18

A compound is found to be 30.45% nitrogen and 69.55% oxygen by mass, with a molar mass of approximately 92 g/mol. What is its molecular formula?

Accepted Answer

$N_2O_4$

Question 19

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

Accepted Answer

Tetraphosphorus decasulfide

Question 20

Which of the following best explains why $MgO$ has a higher lattice energy than $NaCl$?

Accepted Answer

The charges on $Mg^{2+}$ and $O^{2-}$ are greater than those on $Na^+$ and $Cl^-$, resulting in a stronger electrostatic attraction.

Chapter 5: Ionic and Covalent Compounds – Structured Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards