Rate Equations And Kp Flashcards
What is a continuous monitoring method
When you follow a reaction all the way through to its end by recording the amount of product (or reactant) you have at regular time intervals
What is the difference between colorimeters and calorimeters
Colorimeters measure the absorbance
Calorimeters measure the enthalpy
How to work out the gradients
Change in y / change in X
What is the general rate equation
Rate = k[A]^m [B]^n
Where m and n are the orders of the reaction
What is the order of reaction with respect to A, if [A] changes and the rate remains the same
Zero order
What is the order of reaction with respect to A if the rate is proportional to [A]
First order
What is the order of reaction with respect to A is the rate is proportional to [A]^2
Second order
What is k
The rate constant
It links the concentration of reactants to the rate of a reaction
What do you measure in a clock reaction
How the time taken for a set amount of product to form changes as you change the concentration of one of the reactants
What assumptions do you need to make in a clock reaction
- the concentration of each reactant doesn’t change significantly over the time period
- the temperature stays constant
- when the endpoint is seen, the reaction has not proceeded too far
First order graph
Straight line
Second order graph
Curve with +ve gradient
Zero Oder graph
Horizontal line
What is the rate determining step
The step with the slowest rate
What is the Arrhenius equation
K = Ae ^(-Ea/RT)
K - rate constant A - constant T - temp (K) R- gas constant (8.31) Ea - activation energy
