Rates Of Reaction Flashcards
How is the rate of reaction calculated
Change in concentration over time
How do you calculate the overal order
Sum of orders of individual reactants
What is the relation between a zero order reactant and the rate of reaction
As conc x2 rate increases by x2^0 (1)
No effect on conc
What is the relation between a first order reactant and the rate of reaction
Directly proportional
As conc x2 so does rate
What is the relation between a second order reactant and the rate of reaction
As conc x2 rate x2^2 (4)
What’s the difference in half life’s of first and second orders
First = constant half life
Second = varies
If conc ^ what effect will this have on the half life of a 1st order reactant
No change
What is the iterium rate
Expect rate due to reactant of known order
How can you tell if a reaction is multi step
More than 2 molecules in stoichiometry
Very unlikely that >2 molecules collide at once
What is a reaction mechanism
A series of steps that add up to make the equation
What does the rate equation tell you
Effects of conc of reactants on rate
molecules in rate Determining step
Ratio of molecules in rate determine step
What effect does temperature have on the rate constant
^ 10°c = x2 rate
Why does the rate of reaction increase with temperature
More collisions
More successful collisions becuase more molecules have activation energy
What does the prexponential factor in the arrhenius equation mean
Takes into account the frequency of collisions with correct orientation
What does the exponential factor in the arrhenius equation mean
Proportion of molecules with activation energy or more
