What does the rate of a reaction show?
How fast reactants are converted into products.
What does the rate of a reaction depend on?
The concentration of the reactants and the rate constant.
What are the different orders?
Zero Order
First Order
Second Order
Describe zero order.
The concentration of this species has no impact on the rate. It is shown graphically as a horizontal line. Rate = k
Describe first order.
The concentration of the species and rate are directly proportional. Doubling the concentration doubles the rate.
Rate = k[A]
The graph is basically y = x.
Describe second order.
The rate is proportional to the concentration squared. Doubling the concentration will increase the rate by 4.
Rate = k[A]^2
What is the rate constant?
K.
What affects the rate constant?
Temperature only.
What does the Arrhenius equation show?
How the rate constant k and temperature are related exponentially.
What is the Arrhenius equation?
K = Ae^-Ea/RT
What is the logged form of the Arrhenius equation?
lnK = lnA - Ea/RT
What equation is similar to the logged Arrhenius equation?
Y = mx + c
What is on the x and y axis for the Arrhenius equation graph?
x = 1/T
y = lnK
What does the gradient equal to on the Arrhenius equation graph? What is special about the gradient?
-Ea/R.
It is always negative.
What is the y-intercept equal to on the Arrhenius equation graph?
lnA
What is the overall rate of the reaction determined by?
The slowest step - the rate determining step.
What does the rate equation include?
All the species involved in the stages up to and including the rate determining step.
