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Exam 4: The Major Classes of Chemical Reactions

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Question 1

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Which of the following solutions will be the poorest conductor of electrical current?

A) sucrose, C₁₂H₂₂O₁₁(aq)
B) sodium chloride, NaCl(aq)
C) potassium nitrate, KNO₃(aq)
D) lithium hydroxide, LiOH(aq)
E) sulfuric acid, H₂SO₄(aq)

F) A) and D)
G) C) and D)

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Question 2

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What volume, in L, of 10.0 M HCl is needed to make 2.00 L of 2.00 M HCl solution by dilution with water?

A) 0.800 L
B) 0.400 L
C) 0.200 L
D) 0.100 L
E) none of the above

F) All of the above
G) B) and E)

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Question 3

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Sodium thiosulfate, Na₂S₂O₃, is used as a "fixer" in black and white photography. Identify the reducing agent in the reaction of thiosulfate with iodine. 2S₂O₃^2-(aq) + I₂(aq)  S₄O₆^2-(aq) + 2I^-(aq)

Some covalent compounds dissolve in water to produce conducting solutions.

All combustion reactions are classified as combination reactions.

Predict the product(s) for the following reaction. Cl₂O₇(g) + H₂O(l) 

Which of the following will be least soluble in water?

Potassium chloride, KCl, sodium sulfate, Na₂SO₄, glucose, C₆H₁₂O₆, carbon dioxide, CO₂ and ammonium phosphate, (NH₄) ₃PO₄, are soluble in water. Which one produces the largest number of dissolved particles per mole of dissolved solute?

Select the correct set of products for the following reaction. Ba(OH) ₂(aq) + HNO₃(aq) 

Ammonia, NH₃, produces hydroxide ions in aqueous solution by

a. A solution of common salt, NaCl, in water has a concentration of 0.0921 M. Calculate the number of moles of NaCl contained in 50.0 mL of this solution. b. If, instead, an NaCl solution is prepared by dissolving 10.0 g of solid NaCl in enough water to make 250. mL of solution, what is the molarity?

Select the classification for the following reaction. BaCl₂(aq) + K₂SO₄(aq)  BaSO₄(s) + 2KCl(aq)

Lithium hydroxide is used in alkaline batteries. Calculate the molarity of a solution prepared by dissolving 1.495 moles of LiOH in enough water to give a final volume of 750. mL.

Select the net ionic equation for the reaction between lithium hydroxide and hydrobromic acid. LiOH(aq) + HBr(aq)  H₂O(l) + LiBr(aq)

Select the classification for the following reaction. 2Na(s) + 2H₂O(l)  2NaOH(aq) + H₂(g)

Which one of the following substances is a strong acid?

Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed. CuCl₂(aq) + Na₂CO₃(aq) 

a. You are provided with a 250 mL volumetric flask, deionized water, and solid NaOH. How much NaOH should be weighed out in order to make 250. mL of 0.100 M solution? b. 25.0 mL of the 0.100 M aqueous NaOH is titrated against sulfuric acid, H₂SO₄, according to the equation 2NaOH(aq) + H₂SO₄(aq)  Na₂SO₄(aq) + 2H₂O(l) If the volume of sulfuric acid solution required to neutralize the NaOH is 18.62 mL, what is its concentration?

Sodium tripolyphosphate is used in detergents to make them effective in hard water. Calculate the oxidation number of phosphorus in Na₅P₃O₁₀.

How many sodium ions are present in 325 mL of 0.850 M Na₂SO₄?