CHEMISTRY 31

Fall, 2013 - Dixon

Homework Set 1 (for Exam 1)

Note:  Text problems will not be collected but there will be a 10 point quiz on the homework completion date unless otherwise specified

Chapter                                       Problems                                             Date to finish

Set 1.1                                                                                                          Feb. 5

Ch. 1                                              1a, 5, 11, 13, 15, 20, 24,

32, 35, 37, 42, 46

Ch. 3                                              1, 2, 5a-d, 11

text solutions

Turn in corrected diagnostic quiz by Feb. 5 (10 points).  No Additional Problem 1.1

# Set 1.2Feb. 19

Ch. 3                                              14, 16a-f

Ch. 4                                              4, 9, 11, 20, 21, 30

Ch. 6                                              4, 6 [these will be postponed to set 1.3]

text solutions

The concentrations of a sugar, which we will abbreviate LG, was detected in smoke from a forest fire using two different methods (values for 7 samples given below).  Determine if there is a statistically significant difference in the two measurement techniques.  If there may be a reason to justify eliminating one sample from the set of data, you may do so if it is based on a statistical test.

LG concentrations in ng/m3.

 Sample # 1 2 3 4 5 6 7 Method A 5789 860 2394 3523 1467 2233 1957 Method B 6091 2409 2976 4172 1726 2133 2560

Set 1.3                                                                                                          Mar. 3 (no quiz)

Ch. 6                                              8, 15-17, 19, 21, 23, 24, 33, 36, 43, 48

text solutions

The following chemical reaction (below) has a DG° value = -48.2 kJ/mol (at 25°C).  (10 pts)

Hg2+ + 2C2H3O2-Hg(C2H3O2)2 (aq)

a)  Determine K for the above reaction

b) Using the Ka for the loss of H+ from acetic acid (C2H3O2H) given in the appendix, determine the K for: Hg2+ + 2C2H3O2H ↔ Hg(C2H3O2)2 (aq) + 2H+

c) If 100 mL of solution containing the above reactants is diluted with 100 mL of water, in which direction would the reaction shift?  Explain your answer.