factors affecting the rate of reaction

Question 1

what are the 4 factors that affect the rate of reacton

Answer 1

temperature
concentration/pressure
surface area
the abscense or prescence of a catalyst

Question 2

theory behind reactions

Answer 2

collision theory- for particles to react they have to collide with eachother with sufficient energy

Question 3

what does the rate depend on

Answer 3

amount of energy the particles have
more energy they can transfer during the collision

frequency of collisions
how often the particles collide
not all collisions are successful
these two increase rate of reaction

Question 4

if we increase temperature of a reaction what happens

Answer 4

particles will gain more energy so they will move faster and then collide more frequently
they will also collide with more energy and more likely to exceed activation energy
so overall they are more likely to have a higher rate of successful collisions
equalling higher rate of reacton

Question 5

if we increase concentration or pressure in a reaction what happens

Answer 5

more particles per unit of volume
collisions are more frequent so it increases the rate of reaction

Question 6

how does a higher surface area increase the rate of reaction

Answer 6

higher surface area : volume ratio increases frequency of collisions

Question 7

what is a catalyst

Answer 7

substance that speed up a reaction without being used up in the reaction

Question 8

how does a catalyst speed up a reaction

Answer 8

catalyst lowers the minimum amount of activation energy so this means there will be a higher proportion of successful collisions

Question 9

do transisition metals make good catalysts

Answer 9

yes