Q: A solution contains 1.0 × 10^{-2} M $[H_3O^+]$. What is the pH of the solution?

$pH = -\log(1.0 \times 10^{-2}) = 2.00$

Q: A solution is prepared by mixing 5.15 L of 1.20 M NaCl and 2.70 L of 0.50 M NaCl. What is the final concentration after mixing?

$C_f = \frac{(5.15\ \text{L} \times 1.20\ \text{M}) + (2.70\ \text{L} \times 0.50\ \text{M})}{5.15\ \text{L} + 2.70\ \text{L}} = 0.98\ \text{M}$

Q: Which of the following is the correct calculation for the volume of 1.8% (v/v) ethanol solution needed to prepare 375 mL of 0.52% (v/v) ethanol solution?

$V_1 = \frac{C_2 V_2}{C_1} = \frac{0.52\% \times 375\ \text{mL}}{1.8\%} = 109\ \text{mL}$

Question 1

Which of the following solutions is isotonic to human cells?

Accepted Answer

0.9% (m/v) NaCl

Question 2

A solution contains 1.0 × 10^{-2} M $[H_3O^+]$. What is the pH of the solution?

Accepted Answer

$pH = -\log(1.0 	imes 10^{-2}) = 2.00$

Question 3

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

Accepted Answer

NaCl

Question 4

What is the molarity of a solution made by dissolving 19 g of BaCO_3 (molar mass = 197.34 g/mol) in enough water to make 875 mL of solution?

Question 5

Which of the following is the correct balanced equation for the combustion of nonane ($C_9H_{20}$)?

Accepted Answer

$C_9H_{20}(l) + 14O_2(g) \rightarrow 9CO_2(g) + 10H_2O(g)$

Question 6

A solution is prepared by mixing 5.15 L of 1.20 M NaCl and 2.70 L of 0.50 M NaCl. What is the final concentration after mixing?

Accepted Answer

$C_f = \frac{(5.15\ 	ext{L} 	imes 1.20\ 	ext{M}) + (2.70\ 	ext{L} 	imes 0.50\ 	ext{M})}{5.15\ 	ext{L} + 2.70\ 	ext{L}} = 0.98\ 	ext{M}$

Question 7

Which of the following is a structural isomer of ethylcyclobutane?

Accepted Answer

No structural isomer exists for ethylcyclobutane

Question 8

Which of the following pairs are structural isomers?

Accepted Answer

$CH_3CH_2CH_2CH_2CH_3$ and $CH_3CH(CH_3)CH_2CH_3$

Question 9

Which of the following is the correct IUPAC name for the compound shown below?

CH_3-CH(CH_3)-CH(Br)-CH(CH_3)-CH_2-CH_2-CH_2-CH_2-CH_3

Accepted Answer

6-bromo-2,5-dimethylnonane

Question 10

Which of the following statements about solubility rules is correct?

Accepted Answer

All nitrates (NO_3^-) are soluble in water

Question 11

A patient receives an intravenous solution of 0.45% (m/v) NaCl. What effect will this have on their red blood cells?

Accepted Answer

Hemolysis due to hypotonic solution

Question 12

Which of the following is the correct formula for calculating the partial pressure of a gas mixture?

Accepted Answer

$P_{total} = P_1 + P_2 + P_3 + \ldots$

Question 13

Which of the following is a weak electrolyte?

Accepted Answer

CH_3COOH

Question 14

Which of the following pairs correctly identifies the Brønsted-Lowry acid and base in the reaction: $HSO_4^- + OH^- \rightarrow SO_4^{2-} + H_2O$?

Accepted Answer

HSO_4^- is the acid, OH^- is the base

Question 15

Which of the following is the correct calculation for the volume of 1.8% (v/v) ethanol solution needed to prepare 375 mL of 0.52% (v/v) ethanol solution?

Accepted Answer

$V_1 = \frac{C_2 V_2}{C_1} = \frac{0.52\% 	imes 375\ 	ext{mL}}{1.8\%} = 109\ 	ext{mL}$

Question 16

Which of the following is the correct formula for calculating the molarity of a solution?

Accepted Answer

$M = \frac{	ext{moles of solute}}{	ext{liters of solution}}$

Question 17

Which of the following is the correct net ionic equation for the reaction between BaCl_2(aq) and H_2SO_4(aq)?

Accepted Answer

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

Question 18

Which of the following statements about colloids is correct?

Accepted Answer

Colloids cannot pass through semipermeable membranes

Question 19

Which of the following is the correct calculation for the number of moles of Fe^{3+} in 1.25 L of 0.00896 M FeBr_3 solution?

GOB Chemistry Exam Study Guide: Acids, Bases, Solutions, Organic Nomenclature, and Chemical Quantities

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