Rate Equations: Rate Equations Flashcards
1
Q
What is the rate equation?
A
• Rate = k[A]^m[B]^n
- m is order of reaction with respect to A
- n is order of reaction with respect to B
- k is rate constant
2
Q
What does order of reaction mean?
A
- A number that tells you how the concentration of a particular reactant affects the reaction rate
3
Q
What does rate constant mean?
A
- Relates the rate of a chemical reaction at a given temperature to the product of the concentrations of reactants
4
Q
What does overall order of reaction mean?
A
- Sum of all the individual orders of all the reactants in a chemical reaction
5
Q
What does the rate equation tell us?
A
- Describes the relationship between the rate of chemical reaction and the concentrations/pressures of reagents
6
Q
What are the possible orders of reaction at A-Level?
A
- Zero order
- First order
- Second order
7
Q
What does zero order mean?
A
- The concentration of this species has no impact on rate
- Rate = k
- Species not shown in rate equation
8
Q
What does zero order look like on a concentration-rate graph?
A
- A horizontal line
9
Q
What does first order mean?
A
- The concentration of the species and rate are directly proportional
- Doubling the concentration doubles the rate
- Rate = k[A]
10
Q
What does first order look like on a concentration-rate graph?
A
- A straight diagonal line with a positive correlation
11
Q
What does second order mean?
A
- The rate is proportional to the concentration squared
- Doubling the concentration will increase the rate by 4
- Rate = k[A]^2
12
Q
What does second order look like on a concentration-rate graph?
A
- Curved line, right half of a smiley face, with a positive correlation
