
(Note that the problems assigned in this first set (16.1 – 16.45) are almost all review problems over material that was covered originally in General Chemistry. The answers to some of the questions asked appear on the handout distributed in class). 
161 
Some T/F questions about rates and rate laws. 
162 
A question about the relationship between the form of the rate law and the units of the rate constant. 
163 
A short question about the relationship between rates for two reactants
that have different stoichiometric coefficients. The general equation for a reaction 
169 
A small thought problem that points out that rate constants are not rates. 
1615 
An exercise based on a firstorder rate law. Applied calculus. (See pg 521 of the textbook). 
1626 
A problem that is preparation for problems in which the rate law is determined from data about initial rates. 
1633 
Determination of a rate law from information about initial rates (see pg 529 of the textbook).. Calculate the rate constant for each set of concentrations and then average those rate constants for the best value. Note that rate constants are seldom known to much more than two digits. 
1645 
Another problem in which a rate law is determined from information about initial rates. Very important. 
1660 
Three T/F questions related to the Arrhenius equation, which is a
description of how a rate constant changes with temperature: 
1663 
Given the rate constant at two temperatures calculate E_{a} [from k = A exp (E_{a}/RT)] and then the preexponential factor A. Look at their values. 


1610 
An exercise in identifying the various components of a mechanism. Remember that an intermediate is formed and then consumed while a catalyst is the same when the reaction has gone to completion as when the reaction started. The concept of “stoichiometric number” is not important but please work out how the different reaction steps can be combined to give an overall balanced reaction. 
1621 
A small problem about an important distinction (same word used differently in two contexts) 
1641 
Another short problem that emphasizes a very important distinction. 
1652 
A small thought problem that emphasizes the low probability of collisions involving more than two molecules. A collision takes place in ca 10^{12} s, and the probability of three molecules hitting each other within that length of time is very low. The probability of four molecules hitting each other within 10^{12} s is essentially zero. Also, if the reaction goes forward in a single step it must go backwards in a single step. 
1653 
Practice in writing down the differential equations that correspond to a mechanism. 
1660 
Three T/F questions related to the Arrhenius equation, which is a
description of how a rate constant changes with temperature: 
1663 
Given the rate constant at two temperatures calculate E_{a} [from k = A exp (E_{a}/RT)] and then the preexponential factor A. Look at their values. 
1669 
The relationship of E_{a} for the forward reaction, E_{a} for the reverse reaction, and DH^{o} (or DU^{o}, it doesn't really matter) for the overall reaction. 
1692 
A T/F question about catalysts. Catalysts are substances that increase the rate of the reaction without appearing in the overall balanced equation. 
R1616 
An exercise in deriving a rate law from a mechanism using (1) the
steadystate approximation for intermediates, and (2) the ratedetermining
step (or, slowstep) approximation.
The two rate laws are the same if the approximations are valid. The assumption for part (b) is that k_{1}
and k_{1} are much larger than k_{2} so that 