Second Free-Response Question in Visual C#.NET

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Second Free-Response Question
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You have 10 minutes You may not use a calculator Answer all three of the following questions Each question will have two parts writing the balanced chemical equation and answering a question about the reaction Coefficients in the balanced chemical equation must be in the lowest whole-number ratio Do not include formulas for substances that remain unchanged during the reaction Unless otherwise noted, assume all the reactions occur in aqueous solution If a substance is extensively ionized and therefore is present as ions in solution, write its formula as ions Example: Hydrochloric acid is added to a lead(II) nitrate solution
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2+ Pb + 2 Cl PbCl2
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a Metallic strontium is added to warm water If phenolphthalein indicator was added to the resulting solution, what would be the color of the solution Explain b Solid manganese(IV) oxide is added to concentrated hydrochloric acid What is the oxidation number of the species being oxidized before and after the reaction takes place c A lead(II) nitrate solution is mixed with an ammonium sulfate solution Which ions, if any, are spectator ions in this reaction
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Reactions and Periodicity 85
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U Answers and Explanations
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First Free-Response Question
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a 4 OH + Al Al(OH)4 3+
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The aluminum ion behaves as the Lewis acid, because it is accepting electron pairs from the hydroxide anion You get 1 point for the correct formulas for the reactants and products and 1 point for the correct coefficients in the balanced equation Answering the associated question correctly is worth 1 point
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b 5 Fe + 8 H + MnO4 5 Fe + Mn + 4 H2O 2+ 3+ 2+ +
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The purple color of the permanganate ion slowly disappears as the reaction proceeds You get 1 point for the correct formulas for the reactants and products and 1 point for the correct coefficients in the balanced equation Answering the associated question correctly is worth 1 point
+ c Cl2O7 + H2O 2 H + 2 ClO4
The oxidation number of the chlorine in the perchlorate ion is +7 You get 1 point for the correct formulas for the reactants and products and 1 point for the correct coefficients in the balanced equation Answering the associated question correctly is worth 1 point There is a maximum of 9 points possible
Second Free-Response Question
a Sr + 2 H2O Sr2+ + 2 OH + H2 The resulting solution is basic owing to the presence of the hydroxide ion The phenolphthalein indicator is pink in basic solutions, so the solution would be pink You get 1 point for the correct formulas for the reactants and products and 1 point for the correct coefficients in the balanced equation Answering the associated question correctly is worth 1 point
+ 2+ b MnO2 + 4 H + 2 Cl Mn + Cl2 + 2 H2O
Chlorine is being oxidized from 1 in the chloride ion to 0 in diatomic chlorine gas You get 1 point for the correct formulas for the reactants and products and 1 point for the correct coefficients in the balanced equation Answering the associated question correctly is worth 1 point
2 c Pb + SO4 PbSO4 + The spectator ions are the nitrate ions (NO3 ) and the ammonium ions (NH4 ) 2+
You get 1 point for the correct formulas for the reactants and products and 1 point for the correct coefficients in the balanced equation Answering the associated question correctly is worth 1 point There is a maximum of 9 points possible
86 U STEP 4 Review the Knowledge You Need to Score High
U Rapid Review
Reactions will always occur in the free-response section of the AP exam This may not be true in the multiple-choice part Energy may be released in a reaction (exothermic) or absorbed (endothermic) Chemical equations are balanced by adding coefficients in front of the chemical species until the number of each type of atom is the same on both the right and left sides of the arrow The coefficients in the balanced equation must be in the lowest whole-number ratio Water is the universal solvent, dissolving a wide variety of both ionic and polar substances Electrolytes are substances that conduct an electrical current when dissolved in water; nonelectrolytes do not Most ions in solution attract and bind a layer of water molecules in a process called solvation Some molecular compounds, like acids, ionize in water, forming ions In the molecular equation, the reactants and products are shown in their undissociated/unionized form; the ionic equation shows the strong electrolytes in the form of ions; the net ionic equation drops out all spectator ions and shows only those species that are undergoing chemical change Precipitation reactions form an insoluble compound, a precipitate, from the mixing of two soluble compounds Learn and be able to apply the solubility rules Redox reactions are reactions where oxidation and reduction take place simultaneously Oxidation is the loss of electrons and reduction is the gain of electrons Oxidizing agents are reactants that cause oxidation to take place (the reactant being reduced), and reducing agents are reactant species that cause reduction to take place (the reactant being oxidized) Combination reactions are usually redox reactions in which two or more reactants (elements or compounds) combine to form one product Decomposition reactions are usually redox reactions in which a compound breaks down into two or more simpler substances Single displacement reactions are redox reactions in which atoms of an element replace the atoms of another element in a compound Know how to use the activity series to predict whether or not an element will displace another element Combustion reactions are redox reactions in which the chemical species rapidly combine with diatomic oxygen gas, emitting heat and light The products of the complete combustion of a hydrocarbon are carbon dioxide and water Indicators are substances that exhibit different colors under acidic or basic conditions Acids are proton donors (electron-pair acceptors)
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