CH302H - Principles of Chemistry II: Honors
Spring
2014, Unique 51880

Homework, Week 13


Homework, week 13.pdf
Answer Key

Homework 13     Kinetics

 

Practice Problems from the Oxtoby text:

1, 3, 5, 7, 13, 17, 21, 35, 39, 53, 67
more interesting
25, 27, 47


A couple of others to play with:

1.     A clay pot is found at an archeological dig.  Using mass spectrometry and a piece of straw found in the clay, the 14C concentration is found to be 0.233% of the base amount expected at the time the straw was added to the clay. 
a)  How old is the pot? 
b)  If the uncertainty of the quantitative data found in the mass spectral data were + .0023%, what is an estimate of uncertainty in the age you calculated?

2.     Below is the concentration data for a reactant species in a particular reaction as the reaction proceeds.

 

t (s)

conc (M)

0

1.34E-03

0.4

7.18E-04

0.8

3.85E-04

1.2

2.06E-04

1.6

1.10E-04

2

5.92E-05

2.4

3.17E-05

a)      Estimate the initial rate of reaction from the data.

b)    Is this value constant as the reaction proceeds, i.e., at different times?

c)     What is the order of the reaction?

d)    What would you plot versus time to obtain a linear relationship?

e)     What is the rate constant?

f)     What is the true initial rate of reaction at t = 0?