Second Free-Response Question in Visual C#

Recognize Data Matrix 2d barcode in Visual C# Second Free-Response Question

Second Free-Response Question
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You have 20 minutes to answer the following questions You may not use a calculator You may use the tables in the back of the book Five beakers are placed in a row on a countertop Each beaker is half filled with a 020 M aqueous solution The solutes, in order, are: (1) potassium sulfate, (2) methyl alcohol, (3) sodium carbonate, (4) ammonium chromate, and (5) barium chloride The solutions are all at 25 C Answer the following questions with respect to the five solutions listed above a Which solution will form a precipitate when ammonium chromate is added to it Give the formula of the precipitate b Which solution is the most basic Explain c Which solution will exhibit the lowest boiling-point elevation Explain d Which solution is colored e Which of the other solutions will not react with solution (5), barium chloride
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U Answers and Explanations
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First Free-Response Question
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a 1 point for picking solution 5, and 1 point for picking solutions 2 and 3 b 1 point for picking solution 4, and 1 point for saying the ammonium ion (NH4+) is a weak acid, or that it undergoes hydrolysis c 1 point for picking solutions 2 and 4, and 1 point for BaSO4 d 1 point for picking solution 3, and 1 point for saying it is a non-electrolyte or that it does not ionize e 1 point for the order: 3 < 2 < 1 < 5 < 4, and 1 point for the explanation The explanation must relate the order to the number (concentration) of solute particles in the solution There is a total of 10 points possible
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Solutions and Colligative Properties 195
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Second Free-Response Question
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a Solution (5) barium chloride will give a precipitate The formula of the precipitate is BaCrO4 You get 1 point for picking the correct solution, and 1 point for the correct formula for the precipitate b Solution (3) sodium carbonate is the most basic Since the carbonate ion is the conjugate base of a weak acid, it will undergo significant hydrolysis to produce a basic solution You get 1 point for picking the correct solution, and 1 point for the correct explanation c Solution (2) methyl alcohol will show the least boiling point elevation Methyl alcohol is the only nonelectrolyte You get 1 point for picking the correct solution, and 1 point for the correct formula for the explanation d Solution (4) ammonium chromate is yellow You get 1 point for picking the correct solution e Solution (2) methyl alcohol is the only solution that will not form a precipitate with barium chloride You get 1 point for picking the correct solution
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U Rapid Review
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A solution is a homogeneous mixture composed of a solvent and one or more solutes A solute is a substance that dissolves in the solvent and is normally present in smaller amount The general rule of solubility is like dissolves like This means that polar solvents dissolve polar solutes and nonpolar solvents dissolve nonpolar solutes A saturated solution is one in which the maximum amount of solute is dissolved for a given amount of solvent at a given temperature Any solution with less than the maximum solute is called unsaturated A solution with greater than maximum solute is supersaturated (an unstable state) Solution concentration may be expressed as a percentage, which is the amount of solute dissolved per 100 units of solvent It may be expressed as mass %, mass/volume %, or volume/volume % Know how to calculate the appropriate percentage concentration for a solution For the chemist the most useful unit of concentration is molarity (M ), which is the moles of solute per liter of solution Know how to work molarity problems Another concentration unit is molality (m), which is the moles of solute per kilogram of solvent Know how to work molality problems Electrolytes conduct an electrical current when melted or dissolved in a solvent, whereas nonelectrolytes do not Colligative properties are properties of solutions that depend simply on the number of solute particles and not the types Colligative properties include: 1 Vapor pressure lowering The vapor pressure of the solvent is lower in a solution than in the pure solvent 2 Freezing-point depression The freezing point of a solution is lower than that of the pure solvent
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