Fundamentals Of Chemical Composition And Reaction Stoichiometry Practice Tests

Question 1

An unknown isotope of an element has a mass number of $65$ and contains $35$ neutrons. Determine the number of protons and identify the element.

Accepted Answer

30 protons, Zinc

Answer

35 protons, Bromine

Answer

65 protons, Terbium

Answer

30 protons, Gallium

Question 2

A laboratory technician needs to prepare a solution using $2.50$ kilograms of a substance. If the density of the substance is $1.84 	ext{ g/cm}^3$, calculate the volume required in milliliters (mL).

Accepted Answer

1358.7 mL

Question 3

Calculate the number of atoms present in $12.0$ grams of pure Carbon-12 ($12.01 	ext{ g/mol}$).

Accepted Answer

6.02 	imes 10^{23} 	ext{ atoms}

Answer

1.20 	imes 10^{23} 	ext{ atoms}

Answer

3.01 	imes 10^{23} 	ext{ atoms}

Answer

2.40 	imes 10^{24} 	ext{ atoms}

Question 4

Determine the chemical formula for the ionic compound formed between Aluminum ($Al^{3+}$) and Sulfate ($SO_4^{2-}$).

Accepted Answer

Al_2(SO_4)_3

Question 5

Which of the following is the correct name for the molecular compound $P_4O_{10}$?

Accepted Answer

Tetraphosphorus decaoxide

Answer

Phosphorus oxide

Answer

Quadphosphorus oxide

Answer

Phosphorus(V) oxide

Question 6

A compound is found to be $40.0\%$ Carbon, $6.7\%$ Hydrogen, and $53.3\%$ Oxygen by mass. Which of the following steps are correct for determining the empirical formula?

Accepted Answer

Option A

Answer

Option B

Answer

Option C

Answer

Option D

Question 7

The empirical formula of a compound is $CH_2O$ and its molar mass is $180.18 	ext{ g/mol}$. The molecular formula of this compound is $C_6H_{12}O_6$.

Accepted Answer

True

Answer

False

Question 8

A solution is prepared by dissolving $0.10	ext{ mol}$ of a substance in $1.0	ext{ L}$ of water. If the solution exhibits high electrical conductivity, which of the following substances is most likely present?

Accepted Answer

NaCl

Answer

CH_3COOH

Answer

BaSO_4

Answer

C_6H_{12}O_6

Question 9

When aqueous solutions of $Pb(NO_3)_2$ and $KI$ are mixed, a precipitate forms. Write the net ionic equation for this reaction.

Accepted Answer

Pb^{2+}(aq) + 2I^-(aq) \rightarrow PbI_2(s)

Question 10

Consider the reaction between $Ba(OH)_2$ and $HNO_3$. If $25.0	ext{ mL}$ of $0.200	ext{ M } HNO_3$ is required to neutralize $10.0	ext{ mL}$ of a $Ba(OH)_2$ solution, what is the molarity of the $Ba(OH)_2$ solution?

Accepted Answer

0.250 M

Answer

0.100 M

Answer

0.200 M

Answer

0.500 M

Question 11

In the reaction $HCl(aq) + NaOH(aq) \rightarrow NaCl(aq) + H_2O(l)$, the $Na^+$ and $Cl^-$ ions are considered spectator ions.

Accepted Answer

True

Answer

False

Question 12

Which of the following compounds will form a precipitate when mixed with an aqueous solution of $AgNO_3$?

Answer

NaCl

Answer

KBr

Answer

NaNO_3

Answer

KCH_3COO

Question 13

Calculate the volume of $0.500	ext{ M } NaOH$ required to neutralize $50.0	ext{ mL}$ of $0.200	ext{ M } H_2SO_4$.

Accepted Answer

40.0 mL

Question 14

Determine the chemical formula for iron(III) sulfate, given that the iron cation has a charge of $3+$ and the sulfate polyatomic anion is $SO_4^{2-}$.

Accepted Answer

Fe_2(SO_4)_3

Question 15

A compound is found to contain $40.0\%$ carbon, $6.7\%$ hydrogen, and $53.3\%$ oxygen by mass. What is the empirical formula of the compound?

Accepted Answer

Option A

Answer

Option B

Answer

Option C

Answer

Option D

Question 16

What is the correct name for the molecular compound $P_4O_{10}$?

Accepted Answer

Option A

Answer

Option B

Answer

Option C

Answer

Option D

Question 17

In the reaction $2Al + 3Cl_2 \rightarrow 2AlCl_3$, if $5.00\,mol$ of $Al$ and $6.00\,mol$ of $Cl_2$ are reacted, calculate the number of moles of $AlCl_3$ produced.

Accepted Answer

4.00 mol

Question 18

If the theoretical yield of a reaction is $10.0\,g$ and the actual yield is $8.5\,g$, the percent yield is $85\%$.

Accepted Answer

True

Answer

False

Question 19

Which of the following compounds are named using Greek prefixes?

Accepted Answer

Option A

Answer

Option B

Answer

Option C

Answer

Option D

Question 20

A sample of a hydrocarbon has a molar mass of $56.11\,g/mol$ and an empirical formula of $CH_2$. Determine the molecular formula.

Accepted Answer

C_4H_8

Fundamentals Of Chemical Composition And Reaction Stoichiometry Practice Tests

Practice Tests

Fundamentals of Chemical Composition and Reaction Stoichiometry

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