Question 1

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

Accepted Answer

Ionic compounds are composed of cations and anions held together by electrostatic forces, while molecular compounds are composed of nonmetals sharing electrons.

Question 2

What is the empirical formula for a compound with the molecular formula $\mathrm{C_6H_{12}O_6}$?

Accepted Answer

$\mathrm{CH_2O}$

Question 3

Which of the following is the correct name for the compound $\mathrm{FeCl_3}$?

Accepted Answer

Iron(III) chloride

Question 4

A sample of a compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula of this compound?

Accepted Answer

$\mathrm{CH_2O}$

Question 5

Which of the following compounds is a hydrate?

Accepted Answer

$\mathrm{MgSO_4 \cdot 7H_2O}$

Question 6

What is the correct name for $\mathrm{K_2SO_4}$?

Accepted Answer

Potassium sulfate

Question 7

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

Accepted Answer

$\mathrm{N_2O_5}$

Question 8

A 325 mg aspirin tablet contains acetylsalicylic acid ($\mathrm{C_9H_8O_4}$). How many molecules of acetylsalicylic acid are in the tablet? (Molar mass = 180.16 g/mol, $N_A = 6.022 	imes 10^{23}$ mol$^{-1}$)

Accepted Answer

$1.09 	imes 10^{21}$

Question 9

Which of the following is a molecular element?

Accepted Answer

Oxygen ($\mathrm{O_2}$)

Question 10

What is the correct name for $\mathrm{H_2SO_4}$?

Accepted Answer

Sulfuric acid

Question 11

Which of the following is the correct formula for cobalt(II) phosphate?

Accepted Answer

$\mathrm{Co_3(PO_4)_2}$

Question 12

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

Accepted Answer

The empirical formula shows the simplest whole-number ratio of atoms, while the molecular formula shows the actual number of atoms of each element in a molecule.

Question 13

What is the formula mass of $\mathrm{Ca(NO_3)_2}$? (Atomic masses: Ca = 40.08, N = 14.01, O = 16.00)

Accepted Answer

$164.10$ amu

Question 14

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

Accepted Answer

Tetraphosphorus decasulfide

Question 15

Which of the following is the correct name for $\mathrm{NaNO_2}$?

Accepted Answer

Sodium nitrite

Question 16

Which of the following is the correct formula for magnesium chloride hexahydrate?

Accepted Answer

$\mathrm{MgCl_2 \cdot 6H_2O}$

Question 17

Which of the following is the correct name for $\mathrm{HClO_3}$?

Accepted Answer

Chloric acid

Question 18

A compound is found to contain 70% iron and 30% oxygen by mass. What is the empirical formula? (Fe = 55.85, O = 16.00)

Accepted Answer

$\mathrm{Fe_2O_3}$

Question 19

Which of the following is a polyatomic ion?

Accepted Answer

$\mathrm{NO_3^-}$

Question 20

Which of the following is the correct name for $\mathrm{CuSO_4 \cdot 5H_2O}$?

Accepted Answer

Copper(II) sulfate pentahydrate

Chapter 3: Molecules, Compounds, and Chemical Equations - Structured Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards