Rates of Reaction Flashcards
(9 cards)
1
Q
How are rates of reaction measured?
A
By observing the changes in quantities of reactants or products over time
2
Q
Rate =
A
change in concentration/ time
3
Q
Concentration
A
- Measured in moldm-3
- units:moldm-3s-1
- [A] means concentration of A
4
Q
Zero order
A
- When the concentration of a reactant has no effect on the rate.
- Any number raised to the power of zero is 1
5
Q
First order
A
- A reaction is first order when the rate depends on the concentration raised to the power of one.
- Any change in concentration gives the same change in rate.
6
Q
Second order
A
A r
7
Q
Second order
A
- A reaction is second order when the rate depends on the concentration raised to the power of 2
- Any change in concentration changes the rate by the square of the change
8
Q
Overall order
A
The overall order of reaction gives the overall effect of the concentrations of all reactants on the rate of reaction
9
Q
How are orders determined?
A
- They are determined experimentally by monitoring how a physical quantity changes over time.
- Orders can’t be found from a chemical equation
