Kinetics Flashcards
What are the four factors that affect RoR?
Temperature, concentration/pressure, surface area, catalyst
How does increasing temperature increase RoR?
Particles have more energy, more frequent successful collisions, more particles have energies greater or less than Ea.
What is activation energy, Ea?
Minimum energy needed to start a reaction.
How does increasing concentration/ pressure increase RoR?
More particles, more frequent successful collisions.
How does using a catalyst increase RoR?
Lowers Ea, provides an alternative route for the reaction.
What is a catalyst?
Speeds up the reaction, doesn’t get used up/ regenerated at the end.
What is a homogeneous catalyst?
Catalyst is in the same state/ phase as reactants.
What is a heterogeneous catalyst?
Catalyst is in a different state/ phase as the reactants ( eg. catalytic converter, Pt, Pd, Rh)
What are the axis on a Maxwell-Boltzmann diagram?
Y = no. of particles/molecules with energy E X = Energy, E
Where does the line start on a M-B graph? Why?
Origin, no particles with zero energy.
What does the peak on a M-B graph represent?
Most probable energy.
Where is the average energy on a M-B graph? Why?
To the right of the peak, more area on the RHS.
What does the total area under the curve of a M-B graph represent?
All the particles.
What does the area under the graph to the right of the Ea line represent?
No. of particles with sufficient energy to react.
Does the line ever touch the x axis?
No, asymptote.
