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Exam 5: Introduction to Reactions in Aqueous Solutions

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Question 21

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The substance CH₃COOH in water is a:

A) strong electrolyte
B) weak electrolyte
C) nonelectrolyte
D) strong acid
E) strong base

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Question 22

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For redox reactions to be balanced, electrons should be present on the reactant side.

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Question 23

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Gold does not react with either nitric acid or hydrochloric acid but with a combination of both called aqua regia. Identify the oxidizing agent in the following equation: Au(s) + 4 H⁺ + NO₃^- + 4 Cl- → [AuCl₄]^- + 2 H₂O + NO(g)

Write the net ionic equation for the reaction of lead(II) nitrate and sodium iodide.

A 5.000 mL aqueous sample containing hydrogen peroxide was diluted to 25 mL and analyzed by titration with permanganate: 2MnO₄^- + 5H₂O₂ + 6H⁺ → 5O₂ + 2Mn²⁺ + 8H₂O The sample required 42.8 mL of 0.0175 M permanganate to reach the end point. What is the concentration of hydrogen peroxide in the original sample?

Which of the following pairs of aqueous solutions will give a precipitate when mixed?

Which of the following would have the strongest tendency of producing OH- ions in an aqueous solution?

In which of the following pairs is the oxidation number for the underlined element INCORRECT?

In which of the following pairs is the oxidation number for the underlined element INCORRECT?

Balance the following equation in basic solution: Br₂ + Mn²⁺ → MnO₂ + Br- The sum of the coefficients is ________.

Balance the following equation in basic solution: Cr₃⁺ + O₂^2- → CrO₄^2- The sum of the coefficients is ________.

Complete the equation and indicate if a precipitate forms. Na⁺ + Cl^- + NO₃^- + K⁺ →

Balance the following equation for an oxidation-reduction reaction occurring in an acidic solution: HNO₃ + I₂ → HIO₃ + NO₂ + H₂O The sum of the coefficients is ________.

Which of the following is probably the poorest electrical conductor?

Assuming that the proposed reactants are mixed in stoichiometric ratios, and at moderate concentrations, which of the following is least likely to represent an observable (e.g., gas evolution or precipitation) reaction?

A piece of iron wire weighing 1.63 g is converted to Fe²⁺(aq) and requires 21.9 mL of KMnO₄ solution for its titration. What is the molarity of the KMnO₄ solution? The reaction occurring during the titration is: 5 Fe²⁺ (aq) + MnO₄^- (aq) + 8 H⁺ (aq) → 5 Fe³⁺ (aq) + Mn²⁺ (aq) + 4 H₂O

The analysis for iron usually is done by titration with permanganate. Identify the oxidizing agent in the following equation: MnO₄^- (aq) + 5 Fe²⁺ (aq) + 8 H⁺ → 5 Fe³⁺ (aq) + Mn²⁺ (aq) + 4 H₂O

Which of the following compounds is quite insoluble in water, but would liberate a gas when treated with aqueous acetic acid?

Which of the following combinations is correct?

A 0.411 g sample of powdered copper mixed with an inert, soluble additive was fully consumed by 23.4 mL of 0.602 M nitric acid, producing copper(II) nitrate, water, and nitric oxide (NO) gas. What was the percent copper (by mass) in the sample? 3 Cu + 8 HNO₃ → 3 Cu(NO₃) ₂ + 2 NO + 4 H₂O