Practice exam 2 Keller, Exams of Chemistry

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Professor Keller Name _ Student # Section No surprise: there are three parts of the exam: multiple choice, short answer, d “problems". You know the routine about readability and partial credit. Do feel free to remove the equations sheet and periodic table from the back of the exam._Make sure you justify any assumptions made on any problem. See the ball. Be the ball. Multiple Choice (4 points each). Circle the one best answer for each question. 1. For pure oxygen gas, O2(g) at 25°C? (A) AH¢° > 0(B) AIT;°< 0 (C) AGF°>0 (D) aco} >0 (F)S°=0 2. For which reaction will Ky be less than K-? (A) NH(g) = (1/2) Nag) + 3/2) Fale) B) CaCOx(s) = CaO(s) + COx(g) --L C))CIa(g) + 2.O2x(g) FS COx(g) + 2HO()) AN gas (D) PCls(g) = PCh(g) + Ch(g) (E) None of the above. 3. In which process is ASsys < 0? (A) H20(s) = H20 (1) (B) NaCl(aq) = NaCl(s) (C) COs(s) = COn(g) (D) ASsys can never be negative. 4, Which is true of a reaction at equilibrium? A) The rate constant of the forward reaction and the reverse reaction are equal. Gm rates of the forward and reverse reactions are equal. ) There are equal concentrations of products and reactants. (D) Both the forward and reverse rate constants are zero. (E) All of the above