Test Answers - Chemistry 103 50-Minute Class Examination#2...

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Unformatted text preview: Chemistry 103 50-Minute Class Examination #2 Wednesday, November 1, 2006 NAME: IMPORTANT: The time limit for this examination is 50 minutes. I will be leaving the examination room after 51 minutes, so if you do not have your examination turned in by that time, it will not be graded. It is worth showing your work: for questions requiring calculations, partial credit may be given for setting up the problem. 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 A: CsI < MgS < GaAs < LiF or CsI < GaAs < MgS < LiF B: RbI < KBr < NaI < LiF or RbI < NaI < KBr < 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 – ) A: C C H H H O O B: H C O O 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] A: 3 Pb 2+ (aq) + 2 PO 4 3– (aq) → Pb 3 (PO 4 ) 2 (s) B: 2 Fe 3+ (aq) + 3 CO 3 2– (aq) → Fe 2 (CO 3 ) 3 (s) 4. (A) Write the formula for each of the following compounds [9 pts]: (a) ammonium phosphate: (NH 4 ) 3 PO 4 (b) cadmium nitrate: Cd(NO 3 ) 2 (c) lead (IV) oxide: PbO 2 NAME: KEY Score: 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 A: CsI < MgS < GaAs < LiF or CsI < GaAs < MgS < LiF B: RbI < KBr < NaI < LiF or RbI < NaI < KBr < 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 – ) A: C C H H H O O B: H C O O 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] A: 3 Pb 2+ (aq) + 2 PO 4 3– (aq) → Pb 3 (PO 4 ) 2 (s) B: 2 Fe 3+ (aq) + 3 CO 3 2– (aq) → Fe 2 (CO 3 ) 3 (s) 4. (A) Write the formula for each of the following compounds [9 pts]: (a) ammonium phosphate:...
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This note was uploaded on 04/25/2008 for the course CHEM 103 taught by Professor Lewis during the Spring '08 term at Wisc Eau Claire.

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Test Answers - Chemistry 103 50-Minute Class Examination#2...

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