Exam #4 Key

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Percentage (%)Homework<strong>Exam</strong>sQuizzesOverallThe scores above reflect the lowest quiz score dropped and thelowest exam counted at ½ credit.2
Multiple choice section (4 pts each)1. Which response includes all the following processes that are accompanied by an increase inentropy?A. I, II, III, IVB. I and IIC. II, III, IVD. III and IVE. I and IVI. 2SO 2 (g) + O 2 (g) SO 3 (g)II. H 2 O(l) H 2 O(s)III. Br 2 (l) Br 2 (g)IV. H 2 O 2 (l) H 2 O(l) + (1/2)O 2 (g)Answer:____D______2. Which one of the following is a buffer solution?A. 0.40 M HCN and 0.10 KCNB. 0.20 M CH 3 COOHC. 1.0 M HNO 3 and 1.0 M NaNO 3D. 0.10 M KCNE. 0.50 M HCl and 0.10 NaClAnswer:_____A_____3. Over what range of pH is a HOCl NaOCl buffer effective?A. pH 2.0 – pH 4.0B. pH 7.5 – pH 9.5C. pH 6.5 – pH 8.5D. pH 6.5 – pH 9.5E. pH 1.0 – pH 14.0Answer:____C______3
Page 1: CHEM 121Spring 2007Dr. FritschExam
Page 5 and 6: 7. Even though, your calculations s
Page 7 and 8: 10. (13 pts) Consider the reactions
Page 9 and 10: c. (7 pts) Calculate the pH at the

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