SI Chem 178
Beginning of Chapter 14
Leader: Emily
March 24 2013 (Sub)
March 25, 2013
What are 4 things that affect reaction rate?
_______________
__________________
_________________ ______________
With these 4 things in mind, which conditions for each favor FASTER reaction rates?




Reaction rates are always:
+
/
- / Can be either + or –
Write the reaction rate equation for the generalized reaction: aA + bB = cC + dD
Now write it for the following (in terms of both sides):
2HI(g)  H2(g) + I2(g)
2NO2(g)  N2O4(g)
2H2(g) + O2  2H2O(g)
2O3(g)  3O2(g)
Use the table posted on the screen, what is the average rate from 50 to 150s ? (Joe’s
Notes, page 2/20)
Given wW + xX  yY + zZ, what would the rate law look like? Do the coefficients
come into play here?
Rate laws are GIVEN / EXPERIMENTALLY DERIVED
What are the rate orders for the following?
Rate= k[NH4+][NO2-] __________
Rate= k[H2PO2-][OH-]^2 ____________
What happens here if we double H2PO2-? OH-?
Generalization: What’s the rate order here: Rate=k[A]^m [b]^n - (Order = ____ + ____ )
14.5 Given A B + C and that its rate law is Rate= k[A]^x, what would the following
experimental results tell you about x?
a. There is no rate change when [A]o is tripled.
b. The rate increases by a factor of 9 when [A]o is tripled.
c. The rate increases by a factor of 8 when [A]o is doubled.
14.25 Reaction: 2H2(g) + O2(g)  2H2O
a. If hydrogen is burning at a rate of 0.48 mol/s, what is the rate of consumption of
oxygen? What is the rate of formation of H2O?
b. Reaction: 2NO(g) + Cl2(g)  2NOCl This reacts in a closed container, and the partial
pressure of NO is decreasing at a rate of 56torr/min. What is the rate of change of the
total pressure of the container?
14.34 The following are experimental results from the reaction of:
2ClO2(aq) + 2OH-(aq)  ClO3-(aq) + ClO2-(aq) + H2O(l)
Exp #
[ClO2]
[OH-]
1
0.06
0.03
2
0.02
0.03
3
0.02
0.09
a. Determine the rate law.
b. Calculate the rate constant (with units!)
c. Calculate the rate when [ClO2]=0.100M and [OH-]=0.05M
Initial Rate (M/s)
0.0248
0.00276
0.00828