Question

Unless otherwise specified, you may assume T = 25.0 °C in all of the problems on this exam. Part 1. Multiple choice. Circle the letter corresponding to the correct answer. There is one and only one correct answer per problem. [6 points each] 1) Which of the following makes formation of a solution from two pure chemical substances more likely to occur? a) If randomness increases when a solution forms b) If energy decreases when a solution forms c) If energy increases when a solution forms d) Both a and b e) Both a and 2) What is the value for the van't Hoff factor (i) for Cu(NO3)2? a) i= 1 b) i = 2 c) i= 3 d) i=4 e) i>4 3) For which of the folling pure chemical substances will Sº = 0.0 J/mol·K when T = 25.0 °C? a) O2(g) b) 03(g) c) FeCl3(s) d) Both a and b e) None of the above 4) For a chemical reaction to be spontaneous for standard conditions, which of the following must be true? a) AS rxp < 0 b) AS Orx>0 c) AG rx < 0 d) Both a and c e) Both b and c 5) For a particular chemical reaction it is found that the value for the equilibrium constant for the reaction decreases as temperature increases. Based on this we can conclude a) AHørx > 0 b) AH rx < 0 c) AS rx > 0 d) AS < 0 e) AGʻrxn < 0 6) When 0.0100 moles of dimethyl amine ((CH3)2NH) is added to 1.000 liters of water, the pH of the water increases above the value pH = 7.0 found for neutral solutions. Based on this, we may conclude that a) dimethyl amide is a Lewis base b) dimethyl amide is a Bronsted base c) dimethyl amide is an Arrhenius base d) both b and c e) Both a and b and c

Answer 1

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