Free Practice Quiz Question List

03/14 Chemical Composition and the Mole Quiz Online Quiz Questions

Use this free practice quiz with 20 questions to review 03/14 Chemical Composition and the Mole, test your knowledge, and prepare for your next test or exam.

20 questions

True or false

1 point

True or false: In a chemical formula, a coefficient multiplies the entire formula, whereas a subscript applies only to the preceding element or parenthesized group.

A
True
B
False

Choose one

1 point

How many oxygen atoms are represented by one formula unit of Ca(NO3)2?

A
2 oxygen atoms
B
3 oxygen atoms
C
6 oxygen atoms
D
8 oxygen atoms

Written response

1 point

What chemical term describes a formula that gives the simplest whole-number ratio of elements in a compound?

Fill in the blank

1 point

Complete the name of the acid: HNO3 is .

Choose one

1 point

What is the correct name for FeCl3?

A
iron(I) chloride
B
iron(III) chloride
C
iron(II) chloride
D
iron chloride(3)

Choose all

1 point

Select all statements that are correct about the mole and Avogadro's constant.

A
One mole of CO2 contains 6.02214076 × 10^23 CO2 molecules.
B
One mole of carbon contains 6.02214076 × 10^23 carbon molecules.
C
The entities in a mole must be specified, such as atoms, molecules, ions, or formula units.
D
Avogadro's constant has a different value for each substance.

True or false

1 point

True or false: $\mathrm{C_6H_{12}O_6}$ is the molecular formula of glucose, while $\mathrm{CH_2O}$ is its empirical formula.

A
True
B
False

Written response

1 point

How many moles of H2O are in 36.04 g of water? Use a molar mass of 18.02 g/mol. Enter the value in moles.

Fill in the blank

1 point

Complete the neutral ionic formula formed by Al3+ and O2−: .

Choose all

1 point

Select all statements that correctly describe the naming of binary molecular compounds.

A
Prefixes identify the number of atoms in binary molecular compounds.
B
Prefixes are used to determine the charges of ions in ionic compounds.
C
The second element in a binary molecular compound is named with an -ide ending.
D
The prefix mono- is usually omitted for the first element.

Choose one

1 point

A compound contains 40.0% C, 6.71% H, and 53.29% O by mass. What is its empirical formula?

A
CHO
B
CH2O
C
C2H3O2
D
C6H12O6

Choose one

1 point

What is the correct name for the molecular compound N2O5?

A
nitrogen pentoxide
B
dinitrogen oxide
C
dinitrogen pentoxide
D
nitrogen(V) oxide

Open ended

1 point

A sample contains 22.01 g of CO2. Using atomic masses C = 12.01 and O = 16.00, calculate the molar mass of CO2 and the amount of CO2 in the sample. Show the unit-based reasoning and report the amount in moles.

Choose one

1 point

A compound has empirical formula NO2 and molar mass 92.02 g/mol. What is its molecular formula?

A
N2O4
B
NO2
C
N2O5
D
N4O8

True or false

1 point

True or false: In one molecule of $\mathrm{H_2O}$ , the missing subscript after O means that the molecule contains one oxygen atom.

A
True
B
False

Choose one

1 point

How many hydrogen atoms are represented by $3\mathrm{H_2O}$ ?

A
3 hydrogen atoms
B
6 hydrogen atoms
C
5 hydrogen atoms
D
9 hydrogen atoms

Choose one

1 point

What ratio of sodium ions to chloride ions is represented by one formula unit of $\mathrm{NaCl}$ ?

A
One sodium ion for every two chloride ions
B
One sodium ion for every one chloride ion
C
Two sodium ions for every one chloride ion
D
One sodium atom bonded to one chlorine molecule

Choose one

1 point

Which is the correct name for the binary molecular compound $\mathrm{CO_2}$ ?

A
Carbon oxide
B
Carbon monoxide
C
Dicarbon oxide
D
Carbon dioxide

Written response

1 point

How many moles of $\mathrm{H_2O}$ are in 36.04 g of water? Enter the numerical value in mol.

Written response

1 point

A compound has empirical formula $\mathrm{CH_2O}$ and molar mass 180.16 g/mol. What whole-number multiplier converts the empirical formula into the molecular formula?