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Exam 4: Reactions in Aqueous Solutions

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Question 81

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A 0.9182 g sample of CaBr₂ is dissolved in enough water to give 500.mL of solution.What is the calcium ion concentration in this solution?

A) 9.19 × 10^-3 M
B) 2.30 × 10^-3 M
C) 2.72 × 10^-3 M
D) 4.59 × 10^-3 M
E) 1.25 × 10^-3 M

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Question 82

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The oxidation number of Fe in K₃Fe(CN) ₆ is

A) +3
B) +2
C) +1
D) -3
E) -4

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Question 83

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Write the net ionic equation for reaction that occurs when aqueous iron(III)sulfate is added to aqueous sodium sulfide to produce solid iron(III)sulfide and aqueous sodium sulfate.

A piece of zinc metal was added to an aqueous solution of lead(II)nitrate.After some time it was observed that the zinc metal appeared to fall apart and a solid had accumulated at the bottom of the reaction vessel. Write the balanced chemical equation for this reaction.

What type of reaction is the following? C₂H₄(g) + 3 O₂(g) $\rarr$ 2 CO₂(g) + 2 H₂O(g)

Hydrogen is oxidized in the following chemical reaction. H₂ + Cl₂ $\rarr$ 2HCl

Based on the solubility rules, which of the following should be soluble in water?

Identify the precipitate(s) formed when solutions of Ca(ClO₄) ₂(aq) , K₂CO₃(aq) , and NaNO₃(aq) are mixed.

Identify the element being reduced in the following reaction. 4Al + 3O₂ $\rarr$ 2Al₂O₃

Which of the following compounds is a strong electrolyte?

Silver chloride (AgCl)has an extremely low solubility in water; therefore, it is a weak electrolyte.

How many total electrons are transferred in the following reaction? 2Na(s) + Cl₂(g) $\rarr$ 2NaCl(s)

The oxidation number of N in NO is +7.

What is the molar concentration of chloride ions in a solution prepared by mixing 100.mL of 2.0 M KCl with 50.mL of a 1.5 M CaCl₂ solution?

Based on the solubility rules, which of the following should be soluble in water?

The concentration of oxalate ion (C₂O₄^2-) in a sample can be determined by titration with a solution of permanganate ion (MnO₄^-) of known concentration.The net ionic equation for this reaction is 2MnO₄^- + 5C₂O₄^2- + 16H⁺ $\rarr$ 2Mn²⁺ + 8H₂O + 10CO₂ A 30.00 mL sample of an oxalate solution is found to react completely with 21.93 mL of a 0.1725 M solution of MnO₄^-.What is the oxalate ion concentration in the sample?

Which of the following compounds is a weak acid?

Which of the following represents a combustion reaction?

The highest possible oxidation number of carbon is

Write the balanced molecular and net ionic equations for the reaction that would occur between Al(s)and Co(NO₃)₂(aq).Be sure to include the correct states in your final equations.If no reaction is expected, write "no reaction."