$\frac{32.00}{44.01} \times 100 = 72.73\%$

$5.32 \times 3 \times 6.022 \times 10^{23}$

Question 1

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

Accepted Answer

Water is a compound with unique chemical and physical properties due to the bonding of hydrogen and oxygen atoms.

Question 2

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

Accepted Answer

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

Question 3

Which of the following best describes an ionic compound?

Accepted Answer

A compound composed of positively and negatively charged ions held together by electrostatic attraction.

Question 4

What is the correct name for the compound FeCl$_3$?

Accepted Answer

Iron(III) chloride

Question 5

Which formula represents the smallest electrically neutral unit in an ionic compound?

Accepted Answer

Formula unit

Question 6

A compound contains 62.58% C, 9.63% H, and 27.79% O by mass. What is its empirical formula?

Accepted Answer

$\mathrm{C}_4\mathrm{H}_8\mathrm{O}_2$

Question 7

Which of the following is the correct formula for calcium phosphate?

Accepted Answer

$\mathrm{Ca}_3(\mathrm{PO}_4)_2$

Question 8

What is the mass percent of oxygen in CO$_2$? (Atomic masses: C = 12.01 g/mol, O = 16.00 g/mol)

Accepted Answer

$\frac{32.00}{44.01} 	imes 100 = 72.73\%$

Question 9

Which of the following is a correct name for the compound N$_2$O$_5$?

Accepted Answer

Dinitrogen pentoxide

Question 10

How many moles of hydrogen atoms are present in 50.0 g of methane (CH$_4$)? (Atomic masses: C = 12.01 g/mol, H = 1.008 g/mol)

Accepted Answer

4.98 mol

Question 11

Which of the following is the correct formula for magnesium sulfate heptahydrate?

Accepted Answer

$\mathrm{MgSO}_4 \cdot 7\mathrm{H}_2\mathrm{O}$

Question 12

Which of the following is a correct name for H$_2$SO$_4$(aq)?

Accepted Answer

Sulfuric acid

Question 13

What is the molecular formula of a compound with empirical formula CH$_2$O and a molar mass of 180 g/mol? (Molar mass of CH$_2$O = 30 g/mol)

Accepted Answer

$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6$

Question 14

Which of the following is the correct name for Na$_2$CO$_3$ · 10H$_2$O?

Accepted Answer

Sodium carbonate decahydrate

Question 15

Which of the following is a correct formula for ammonium nitrate?

Accepted Answer

$\mathrm{NH}_4\mathrm{NO}_3$

Question 16

Which of the following is a correct name for HCl(aq)?

Accepted Answer

Hydrochloric acid

Question 17

How many oxygen atoms are present in 5.32 moles of CaCO$_3$?

Accepted Answer

$5.32 	imes 3 	imes 6.022 	imes 10^{23}$

Question 18

Which of the following is the correct name for P$_4$O$_{10}$?

Accepted Answer

Tetraphosphorus decoxide

Question 19

Which of the following is a correct formula for copper(I) oxide?

Accepted Answer

$\mathrm{Cu}_2\mathrm{O}$

Chapter 3: Molecules and Compounds – General Chemistry Study Notes

Study Guide - Practice Questions