Rates of reaction y2

How to find rate with a colourimeter

Create standard solutions of reactant with colour and find the absorbance of the solutions. Find absorbance at regular times after reaction started. and use these values to plot a conc time graph

Shape of a concentration time graph for 0 order and 1st order reaction

What is special about half life of a first order

Half life is constant

How to find k from a first order graph (2 ways)

Do gradient over concentration at that point

Find half life and do ln2 / half life

Shape of rate concentration graphs

How to find k for zero order from rate time graph and conc time graph

Rate time: k is the y intercept

conc time: k is the gradient 

Why are multi step reactions common

It is unlikely that all of the particles will collide in the correct orientation at the same time

What is the rate determining step

The slowest step in the reaction, thereby determining the rate of the whole reaction. The species involved in this step are the ones in the rate equation

What does the exponential factor in the Arrenhius equation represent

proportion of molecules above activation energy

What does the pre exponential factor in the Arrenhius equation represent 

The frequency that particles are colliding in the correct orientation (changes with temp but we assume same over small temperature range)