Q: Which of the following pairs are structural isomers?

$$\mathrm{CH_3CH_2CH_2CH_3}$$ \text{ and } \mathrm{CH_3CH($$CH_3$$)$$CH_3$$}$

Q: Which of the following is the correct formula for calculating the pressure of a gas using Dalton's Law of Partial Pressures?

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

Q: Which of the following is the correct calculation for the volume of $$\mathrm{O_2$}$$ gas at STP produced from the complete combustion of $$3.08\ \mathrm{g} of$$ $$\mathrm{C_2H_6}$$? ($$1\ \mathrm{mol\ gas} = 22.4\ \mathrm{L}$$, $$\mathrm{C_2H_6}$$ molar mass = $$30.08\ \mathrm{g/mol})$$

$$3.08\ \mathrm{g} \times \frac{1\ \mathrm{mol}}{30.08\ \mathrm{g}} \times \frac{7\ \mathrm{mol\ O_2$}}{2\ \mathrm{mol\ C_2H_6}} \times 22.4\ \mathrm{L}$$

Question 1

Which of the following is the correct balanced chemical equation for the complete combustion of octane ($$\mathrm{C_8H_{18}}$$)?

Accepted Answer

$$\mathrm{C_8H_{18}(l) + 12.5\ O_2$(g) \rightarrow 8\ CO_2$(g) + 9\ H_2O(g)}$$

Question 2

A solution is prepared by dissolving $$9\ \mathrm{g} of$$ $$\mathrm{$$BaCO_3$$} in$$ $$875\ \mathrm{mL} of $$water. What is the molarity of the solution? (Molar mass of $$\mathrm{$$BaCO_3$$} = 197.34\ \mathrm{g/mol})$$

Accepted Answer

$$1.13\ \mathrm{mol/L}$$

Question 3

Which of the following pairs are structural isomers?

Accepted Answer

$$\mathrm{CH_3CH_2CH_2CH_3}$$ 	ext{ and } \mathrm{CH_3CH($$CH_3$$)$$CH_3$$}$

Question 4

Which of the following is a strong electrolyte?

Accepted Answer

$$\mathrm{NaCl}$$

Question 5

A patient receives an intravenous solution of $$0.9\%$$ NaCl. What type of solution is this relative to blood plasma?

Accepted Answer

Isotonic

Question 6

Which of the following compounds is most soluble in water according to the solubility rules?

Accepted Answer

$$\mathrm{$$NaNO_3$$}$$

Question 7

What is the pH of a solution with $$[\mathrm{H_3O^+}] = 1.2 	imes 10$$^{-10}$$\ \mathrm{M}$$?

Accepted Answer

$$9.92$$

Question 8

Which of the following is the correct IUPAC name for the structure below?

$$\mathrm{CH_3$-CH_2$-CH(Br)-CH(CH_3$)-CH(CH_3$)-CH_2$-CH_2$-CH_2$-CH_3$}$$

Accepted Answer

6-bromo-2,5-dimethylnonane

Question 9

Which of the following statements about colloids is correct?

Accepted Answer

Colloids cannot pass through semipermeable membranes

Question 10

A $$1.25\ \mathrm{L}$$ solution contains $$21.5\ \mathrm{mg} of$$ $$\mathrm{Fe$$^{3+}$$}. $$What is the molarity of $$\mathrm{Fe$$^{3+}$$} in $$the solution? ($$1\ \mathrm{mol\ Fe$$^{3+}$$} = 55.85\ \mathrm{g})$$

Accepted Answer

$$0.00896\ \mathrm{mol/L}$$

Question 11

Which of the following is the correct formula for calculating the pressure of a gas using Dalton's Law of Partial Pressures?

Accepted Answer

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

Question 12

Which of the following is the correct calculation for the volume of $$\mathrm{O_2$}$$ gas at STP produced from the complete combustion of $$3.08\ \mathrm{g} of$$ $$\mathrm{C_2H_6}$$? ($$1\ \mathrm{mol\ gas} = 22.4\ \mathrm{L}$$, $$\mathrm{C_2H_6}$$ molar mass = $$30.08\ \mathrm{g/mol})$$

Accepted Answer

$$3.08\ \mathrm{g} 	imes \frac{1\ \mathrm{mol}}{30.08\ \mathrm{g}} 	imes \frac{7\ \mathrm{mol\ O_2$}}{2\ \mathrm{mol\ C_2H_6}} 	imes 22.4\ \mathrm{L}$$

Question 13

Which of the following solutions will cause hemolysis of red blood cells?

Accepted Answer

Distilled water

Question 14

Which of the following is the correct Bronsted-Lowry acid-base pair in the reaction $$\mathrm{$$HSO_4$$^- + OH^- \rightarrow SO_4$^{2-} + H_2O}$$?

Accepted Answer

$$\mathrm{$$HSO_4$$^-} = $$acid, $$\mathrm{OH^-} = $$base

Question 15

Which of the following is the correct condensed structural formula for ethylcyclobutane?

Accepted Answer

$$\mathrm{CH_2CH_3}$$ attached to cyclobutane ring$

Question 16

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

Accepted Answer

$$\mathrm{pH = -log[H_3O^+]}$$

Question 17

Which of the following is the correct net ionic equation for the reaction of $$\mathrm{$$BaCl_2$$}$$ with $$\mathrm{H_2SO_4}$$?

Accepted Answer

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

Question 18

Which of the following is the correct calculation for the volume of $$1.8\% (w/v) $$NaCl solution needed to prepare $$375\ \mathrm{mL} of$$ $$0.52\% (w/v) $$NaCl solution?

Accepted Answer

$$V_1$$ = \frac{C_2V_2}{$$C_1$$}$$

CHE 103 Exam #3 Study Guide: Acids, Bases, Solutions, Organic Chemistry, and Chemical Quantities

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