3.1.9 Rate equations Flashcards
1
Q
What is rate of reaction?
A
Change in concentration over time
2
Q
What is half life (t1/2)?
A
Time for the concentration of a limiting reacant to become half of its intial value
3
Q
Describe the appearance of the following concentration-rate graphs:
a) order 0
b) order 1
c) order 3
A
a) straight horizontal line
b) linear line
c) exponential curve
4
Q
What is the Arhenius Equation linking k, Ea and temperature?
take natural logs of both sides
A
lnk = lnA - Ea/RT
5
Q
What is the gradient and intercept of a graph of 1/T by lnk?
think: y = mx + c
A
intercept = lnA
gradient = -Ea/R
6
Q
What is the basic format of a rate equation?
A
Rate = k[A]^n [B]^m
7
Q
What is significant about the rate determining step?
A
It is the slowest step
8
Q
How can you tell if something acts as a catalyst?
A
- Appears in rate equation
- Does not appear in overall equation
