Rates Of Reaction Flashcards
what are 4 factors that effect the rate of reaction
temperature - move quicker so collide more often. and more likely to collide with the activation energy
concentration - means collision between important
particles are more likely
surface area
catalysts
what is collision theory
the more often particles collide, the faster the reaction
particles have to collide with enough energy to be successful
what are the 2 factors which would increase the rate of reaction
increasing the amount of collisions and increasing the energy the particles collide with
how do catalysts speed up the rate of reaction
lower the activation energy by providing an alternate reaction pathway
how is rate of reaction calculated
mean rate of reaction = quantity of reactant used or product formed / time ( cm^2/s)
what are 3 ways rate of reaction can be observed by
volume of gas given of
change in mass
precipitation
why does rate of reaction decrease as the reaction happens
at the start of a reaction there are lots of reactants so they have frequent collisions meaning a high rate of reaction. The concentration of reactants decrease as they are used up so there are less frequent collisions between reactants so the rate of reaction decreases
what is a reversible reaction
the products can react to form the reactants
what is equilibrium
the concentration of the reactants and the products remain constant because the forward and backward reaction is happening at the same rate
what does it mean by the equilibrium lies to the right
the concentration of the products is greater
what is le Chateliers Principle
if you change the conditions of a reversible reaction at equilibrium, the system will counteract the change
what happens if you raise the temperature of a reversible reaction
the yield of the endothermic reaction will increase
what happens if you increase the pressure in a reversible reaction
it will favour the reaction that produces the fewest amount of gas molecules
what will happen if you increase the concentration of the reactants of a reversible reaction
more products
