Rate Equation Flashcards
What is an energy profile?
The process of a reaction can be charted by an energy profile
What is the average rate of reaction?
^[X]/ ^t
What are the units of rate ?
mol dm-3 s-1
How could you calculate the rate of reaction from a graph?
The gradient of the graph tells you the rate of reaction
- draw a tangent
What is the rate of reaction in terms of products and reactants?
Rate= d[products]/dt= -d[reactants]/dt
Rate can be found from any species - find derivative
The reactants are negative as they are consumed
You need to correct for stoichiometry to get one mole of the species
What would be the rate equation for aA + bB + cC -> dD + eE
For the rate equation you only use the conc of the reactants
You can only determine order experimentally
Rate= k[A]^x [B]^y [C]^z
What is an elementary reaction?
A single step reaction that involves one or two molecules or atoms
The reaction equation represents the actual change
What is a bulk reaction?
This is many simultaneous elementary reactions
They have very complicated kinetic properties- need experimentation
Reaction equation summarised stoichiometry of reaction, not actual change
Why are is the reaction order not always the stoichiometry?
This is because complex reaction require experimentation to find their reaction order
What factors affect the rate of reaction?
The conc of reactants Temperature Intensity of radiation Particle size of solid Polarity of solvent Catalyst
