Question 1

Which statement best explains why water (H$_2$O) has properties dramatically different from its constituent elements, hydrogen and oxygen?

Accepted Answer

Water is a compound formed by a chemical bond between hydrogen and oxygen, resulting in a new substance with unique properties.

Question 2

Which of the following best describes the Law of Definite Proportion as it applies to water?

Accepted Answer

Water always contains two hydrogen atoms for every one oxygen atom, regardless of sample size.

Question 3

Which type of chemical bond involves the transfer of electrons from a metal to a nonmetal?

Accepted Answer

Ionic bond

Question 4

What is the empirical formula for a compound whose molecular formula is C$_4$H$_8$?

Accepted Answer

$\mathrm{C}_2\mathrm{H}_4$

Question 5

Which statement about ionic compounds is FALSE?

Accepted Answer

Ionic compounds conduct electricity in the solid state.

Question 6

A sample of magnesium reacts with nitrogen to form magnesium nitride. Using Lewis theory, how many electrons does each magnesium atom lose, and what is the formula of the resulting compound?

Accepted Answer

Each magnesium atom loses 2 electrons; formula is Mg$_3$N$_2$.

Question 7

Which of the following is the correct name for the compound Fe$_2$(SO$_4$)$_3$?

Accepted Answer

Iron(III) sulfate

Question 8

What is the correct formula for sodium phosphate, given that the phosphate ion is PO$_4^{3-}$?

Accepted Answer

$\mathrm{Na}_3\mathrm{PO}_4$

Question 9

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

Accepted Answer

$\mathrm{CH}_2\mathrm{O}$

Question 10

Which of the following compounds is a molecular compound?

Accepted Answer

CO$_2$

Question 11

What is the mass percent of chlorine in CCl$_4$? (Atomic masses: C = 12.01 g/mol, Cl = 35.45 g/mol)

Accepted Answer

92.20%

Question 12

A hydrate of copper(II) sulfate has the formula CuSO$_4$·5H$_2$O. What is the correct name for this compound?

Accepted Answer

Copper(II) sulfate pentahydrate

Question 13

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

Accepted Answer

$\mathrm{N}_2\mathrm{O}_5$

Question 14

A compound has an empirical formula of CH$_2$ and a molar mass of 56.1 g/mol. What is its molecular formula?

Accepted Answer

$\mathrm{C}_4\mathrm{H}_8$

Question 15

Which of the following statements about covalent bonds is TRUE?

Accepted Answer

Covalent bonds involve the sharing of electrons between two nonmetal atoms.

Question 16

How many oxygen atoms are present in 1 mole of Al$_2$(SO$_4$)$_3$?

Accepted Answer

12

Question 17

A compound is found to contain 0.60 g C, 0.10 g H, and 0.40 g O. What is the empirical formula of the compound?

Accepted Answer

$\mathrm{C}_3\mathrm{H}_6\mathrm{O}_2$

Question 18

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

Accepted Answer

Dinitrogen tetroxide

Question 19

Which of the following ions is a polyatomic ion?

Accepted Answer

SO$_4^{2-}$

Chapter 4: Molecules and Compounds – Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards