How fast? Flashcards
draw the conc time graphs
draw the rate conc graphs
How do we write rate equations?
what is the rate constant, k
The constant of proportionality between the concentration terms and the rate in the rate equation
what is an individual order?
the power to which a concentraion term is raised in the rate equation
what is an overall order?
the sum of the powers to which the concentraiton terms are raised in the rate equation
how to work out the rate constant
what units is the rate equatiuon?
it depends on the rate orders, but it will always have (mol^x dm^3y s^-1)
what is a half life?
The time measure for the concentraion of a ractant to fall to halkf its original vaule
how do we calculkate the rate constant using a half life?
k = ln 2 / halft life time
or
k = initial rate/initial concentration
how do we calculate the initial rate of reaction?
Draw a tangent to the graph, and calculate the gradient
How big is the activation energy with a fast rate of reaction?
Low
where can you find the arrhenius equation?
In the data sheet
what is used for temperature in the arrhenius equation?
Kelvin
what are the two axis used when working out arrhenius?
x axis = 1/T
y axis = ln K
arrehenius rearrangement and y = mx + c
how do you work out the activation energy using a graph?
