Q: A solution has a pH of 3.0. What is the concentration of $$\mathrm{H^+}$$ ions in the solution?

$$1.0 \times 10$$^{-3}$$\ \mathrm{M}$$

Question 1

Which of the following best describes the net ionic equation for the reaction between aqueous solutions of sodium sulfate and barium chloride?

Accepted Answer

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

Question 2

A sample of a compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula of this compound?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 3

Which of the following statements is TRUE regarding strong and weak acids?

Accepted Answer

A strong acid ionizes completely in water, while a weak acid only partially ionizes.

Question 4

What is the molarity of a solution prepared by dissolving 10.0 g of NaCl (molar mass = 58.44 g/mol) in enough water to make 500.0 mL of solution?

Accepted Answer

$$0.342\ \mathrm{M}$$

Question 5

Which of the following is the correct balanced equation for the combustion of propane ($$\mathrm{C_3H_8}$$)?

Accepted Answer

$$\mathrm{C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O}$$

Question 6

A solution is prepared by diluting 50.0 mL of 6.00 M HCl to a final volume of 300.0 mL. What is the final concentration?

Accepted Answer

$$1.00\ \mathrm{M}$$

Question 7

Which of the following compounds is a strong electrolyte when dissolved in water?

Accepted Answer

$$\mathrm{NaCl}$$

Question 8

What is the oxidation number of sulfur in $$\mathrm{H_2SO_4}$$?

Accepted Answer

$$+6$$

Question 9

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which an insoluble solid forms when two solutions are mixed.

Question 10

If 2.00 mol of $$\mathrm{H_2$}$$ reacts with 1.00 mol of $$\mathrm{O_2$} to $$form water according to $$\mathrm{2H_2 + O_2$ \rightarrow 2H_2O}$$, what is the limiting reactant?

Accepted Answer

$$\mathrm{O_2$}$$

Question 11

A student mixes 0.100 mol of AgNO$$_3$$ with 0.050 mol of NaCl. The reaction is $$\mathrm{$$AgNO_3$$(aq) + NaCl(aq) \rightarrow AgCl(s) + $$NaNO_3$$(aq)}. $$What is the theoretical yield of AgCl in grams? (Molar mass of AgCl = 143.32 g/mol)

Accepted Answer

$$7.17\ \mathrm{g}$$

Question 12

Which of the following is a correct Arrhenius definition?

Accepted Answer

An acid produces $$\mathrm{H^+}$$ ions in aqueous solution.

Question 13

A solution has a pH of 3.0. What is the concentration of $$\mathrm{H^+}$$ ions in the solution?

Accepted Answer

$$1.0 	imes 10$$^{-3}$$\ \mathrm{M}$$

Question 14

Which of the following is a redox reaction?

Accepted Answer

$$\mathrm{2Na(s) + Cl_2$(g) \rightarrow 2NaCl(s)}$$

Question 15

A 25.0 g sample of a compound contains 10.0 g of carbon, 2.0 g of hydrogen, and 13.0 g of oxygen. What is the percent composition of hydrogen?

Accepted Answer

$$8.0\%$$

Question 16

Which of the following is a nonelectrolyte?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} ($$glucose)

Question 17

Which of the following is the correct net ionic equation for the neutralization of HCl with NaOH?

Accepted Answer

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

Question 18

A student performs a reaction and obtains 8.0 g of product. The theoretical yield is 10.0 g. What is the percent yield?

Accepted Answer

$$80.0\%$$

Question 19

Which of the following is a decomposition reaction?

Accepted Answer

$$\mathrm{2H_2O_2(l) \rightarrow 2H_2O(l) + O_2$(g)}$$

CHEM 1311 Test 3 Review: Chemical Reactions, Stoichiometry, Solutions, and Acid-Base Concepts

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