Studied by 0 people
Looks like no one added any tags here yet for you.
definition of a catalyst
speeds up the rate of a reaction and can be recovered at the end of the reaction unchanged.
Provides an alternative reaction pathway with a lower activation energy.
catalyst mass is the same before and after
what is a catalysis
the speeding up of a chemical reaction by using a catalyst
what are the 2 types of catalysts
heterogenous catalyst
homogenous catalyst
Heterogenous catalyst
catalysts that are in a different state to the reactants
e.g. is catalyst is a solid - the reactants either have to be a gas or a liquid such as the harber process
Reaction of heterogenous catalysts
react molecules adsorb to catalyst surface
reactant bonds break
new bonds form to form new products
product diffuses from catalyst surface
catalytic convertors
usually in cars to convert harmful gases into less harmful gases
homogenous catalysts
catalyst is the same physical state as the reactants e.g. enzymes
catalysts can be ___________
poisoned - typically heterogenous
poison molecules can coat the catalyst surface and prevents reactants from binding and reacting
the poison clings to the catalyst surface more strongly than the reactants
why is carbon monoxide regarded as a dangerous pollutant
as its toxic to humans/poisonous
how is nitrogen monoxide formed
from high temperatures which causes nitrogen and oxygen from atmosphere to react
Note 
Flashcard (59)