Question 1

Which of the following best describes a double displacement (metathesis) reaction?

Accepted Answer

A reaction in which the cations and anions of two different compounds exchange places to form two new compounds.

Question 2

Given the reaction: $$ \mathrm{$$AgNO_3$$(aq) + NaCl(aq) \rightarrow AgCl(s) + $$NaNO_3$$(aq)} $$, which of the following is the correct net ionic equation?

Accepted Answer

$$ \mathrm{Ag^+(aq) + Cl^-(aq) \rightarrow AgCl(s)} $$

Question 3

A solution is prepared by dissolving 5.00 g of NaCl in enough water to make 250.0 mL of solution. What is the molarity of the solution? ($$ \mathrm{NaCl} $$ molar mass = 58.44 g/mol)

Accepted Answer

$$ 0.342\ \mathrm{M} $$

Question 4

Which of the following best represents a redox reaction?

Accepted Answer

$$ \mathrm{Zn(s) + Cu$$^{2+}$$(aq) \rightarrow Zn$$^{2+}$$(aq) + Cu(s)} $$

Question 5

A student mixes solutions of $$ \mathrm{$$BaCl_2$$} $$ and $$ \mathrm{Na_2SO_4} . A $$white precipitate forms. What is the identity of the precipitate?

Accepted Answer

$$ \mathrm{$$BaSO_4$$} $$

Question 6

Which of the following is the correct balanced molecular equation for the neutralization of sulfuric acid with sodium hydroxide?

Accepted Answer

$$ \mathrm{H_2SO_4(aq) + 2NaOH(aq) \rightarrow Na_2SO_4(aq) + 2H_2O(l)} $$

Question 7

How many grams of $$ \mathrm{$$CaCl_2$$} $$ are needed to prepare 500.0 mL of a 0.200 M solution? ($$ \mathrm{$$CaCl_2$$} $$ molar mass = 110.98 g/mol)

Accepted Answer

$$ 5.55\ \mathrm{g} $$

Question 8

Which of the following is a correct net ionic equation for the reaction between hydrochloric acid and sodium hydroxide?

Accepted Answer

$$ \mathrm{H^+(aq) + OH^-(aq) \rightarrow H_2O(l)} $$

Question 9

A 25.0 mL sample of 0.100 M $$ \mathrm{H_2SO_4}  is $$titrated with 0.200 M $$ \mathrm{NaOH} . $$What volume of $$ \mathrm{NaOH}  is $$required to reach the equivalence point?

Accepted Answer

$$ 25.0\ \mathrm{mL} $$

Question 10

Which of the following statements about ionic equations is correct?

Accepted Answer

Only the species that undergo a chemical change are included in the net ionic equation.

Question 11

A solution contains $$ \mathrm{0.10\ M\ Na_2SO_4} $$ and $$ \mathrm{0.10\ M\ Ba(NO_3$)_2} . $$What will happen when these solutions are mixed?

Accepted Answer

A precipitate of $$ \mathrm{$$BaSO_4$$} $$ will form.

Question 12

Which of the following is the correct total ionic equation for the reaction of $$ \mathrm{K_2SO_4(aq)} $$ and $$ \mathrm{Ba(NO_3$)_2(aq)} $$?

Accepted Answer

$$ \mathrm{2K^+(aq) + SO_4$^{2-}(aq) + Ba$$^{2+}$$(aq) + 2NO_3^-(aq) \rightarrow $$BaSO_4$$(s) + 2K^+(aq) + 2NO_3^-(aq)} $$

Question 13

A chemist needs to dilute 100.0 mL of a 2.00 M $$ \mathrm{HCl} $$ solution to a final concentration of 0.500 M. What will be the final volume after dilution?

Accepted Answer

$$ 400.0\ \mathrm{mL} $$

Question 14

Which of the following best describes a spectator ion?

Accepted Answer

An ion that is present in the solution but does not participate in the actual chemical reaction.

Question 15

A sample of $$ \mathrm{$$CaCO_3$$}  is $$heated and decomposes according to the equation $$ \mathrm{$$CaCO_3$$(s) \rightarrow CaO(s) + CO_2$(g)} . If 10.0 g of$$ $$ \mathrm{$$CaCO_3$$}  is $$decomposed, how many grams of $$ \mathrm{CO_2$} $$ are produced? ($$ \mathrm{$$CaCO_3$$} $$ molar mass = 100.09 g/mol, $$ \mathrm{CO_2$} $$ molar mass = 44.01 g/mol)

Accepted Answer

$$ 4.40\ \mathrm{g} $$

Question 16

Which of the following is a correct example of a combination (synthesis) reaction?

Accepted Answer

$$ \mathrm{2H_2(g) + O_2$(g) \rightarrow 2H_2O(g)} $$

Question 17

A patient is given an intravenous solution containing 0.90% (w/v) NaCl. What is the molarity of the solution? ($$ \mathrm{NaCl} $$ molar mass = 58.44 g/mol; assume 1 L solution)

Accepted Answer

$$ 0.154\ \mathrm{M} $$

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