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Exam 4: Reactions in Aqueous Solutions

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Question 81

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

A) Combination reaction
B) Acid-base neutralization reaction
C) Hydrogen displacement reaction
D) Disproportionation reaction
E) Combustion reaction

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Question 82

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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 83

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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?

Which of the following compounds is a strong electrolyte?

The highest possible oxidation number of carbon is

Which of the following compounds is a weak acid?

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

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.

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."

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

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

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

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

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.

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

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.

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

Which of the following represents a combustion reaction?

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?