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Old_Exams_2_and_3 - Chemistry 103 50-Minute Class...

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Chemistry 103 50-Minute Class Examination #2 Wednesday, November 1, 2006 NAME: Add the two digits in the heavy boxes and write the total in the double box. Answer part A of each question if the total is even. Answer part B of each question if the total is odd. 1. Arrange the following compounds in expected order of the lattice energy of their crystals. Assume that all the compounds are ionic, and that they crystallize in the same lattice. Order the compounds in increasing order of the expected lattice energy (smallest expected lattice energy first). [8 pts] (A) LiF, MgS, GaAs, CsI (B) RbI, KBr, NaI, LiF 2. Draw a reasonable Lewis structure for the following ions [8 pts]: (A) acetate anion (CH 3 CO 2 ) (B) formate anion (HCO 2 ) 3. (A) Write a balanced net ionic equation for the reaction between lead nitrate and sodium phosphate. [8 pts] (B) Write a balanced net ionic equation for the reaction between ferric nitrate and potassium carbonate. [8 pts] 4. (A) Write the formula for each of the following compounds [9 pts]: (a) ammonium phosphate: (b) cadmium nitrate:
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BLUGOLD: (c) lead (IV) oxide: NAME: Score: 4. (B) Write the formula for each of the following compounds [9 pts]: (a) cobalt (II) phosphate: (b) aluminum nitrate: (c) manganese (IV) oxide: 5. (A) The reaction between potassium dichromate and oxalic acid in acidic solution is given by the balanced equation K 2 Cr 2 O 7 + 4 H 2 SO 4 + 3 H 2 C 2 O 4 K 2 SO 4 + Cr 2 (SO 4 ) 3 + 6 CO 2 + 7 H 2 O (a) How many moles are there in 10.00 g of oxalic acid? [5 pts] (b) How many moles of potassium dichromate are needed to completely oxidize 10.00 g of oxalic acid? [5 pts] (c) How many mL of 2.000 M sulfuric acid will be consumed in the oxidation of 10.00 g of oxalic acid? [6 pts]
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BLUGOLD: 5. (B) The reaction between potassium dichromate and oxalic acid in acidic solution is given by the balanced equation K 2 Cr 2 O 7 + 4 H 2 SO 4 + 3 H 2 C 2 O 4 K 2 SO 4 + Cr 2 (SO 4 ) 3 + 6 CO 2 + 7 H 2 O (a) How many moles are there in 5.000 g of oxalic acid? [5 pts] (b) How many moles of potassium dichromate are needed to completely oxidize 5.000 g of oxalic acid? [5 pts] (c) How many mL of 2.000 M sulfuric acid will be consumed in the oxidation of 5.000 g of oxalic acid? [6 pts] 6. (A) Predict the bonding (ionic, I, or covalent, C) in each of the following compounds. [8 pts] (a) BaO (b) glycerol, C 3 H 8 O 3 (c) lithium sulfate (d) iron (III) sulfide 6. (B) Predict the bonding (ionic, I, or covalent, C) in each of the following compounds. [8 pts] (a) KOH (b) ethanol, C 2 H 6 O (c) lithium phosphate (d) sulfur (IV) oxide
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BLUGOLD: 7 (A) and 7 (B). Is lead sulfate a strong electrolyte in water? Why or why not? [5 pts] 8. Calculate the pH expected of a sulfuric acid acid solution whose concentration is (A) 0.02000 M (B) 0.000200 M Assume that all acidic hydrogens become ionized.[6 pts] 9. What is the molar concentration of a solution of sulfuric acid in the following solution? [12 pts] (A) 25.0 mL of the solution contains 1.234 g of sulfuric acid.
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