4. reaction rates

Question 1

collision theory
a reaction between 2 particles wont take place unless
(2 things)

Answer 1

1. they collide in the right direction (need to be facing each other the right way)
2. they collide with at least a certain minimum amount of kinetic energy

Question 2

collision theory

what is the minimum amount of kinetic energy particles need to react called

Answer 2

activation energy

Question 3

increasing the temperature makes the reaction

Answer 3

faster

Question 4

if you increase temperature particles will on average have

Answer 4

more kinetic energy and will move faster = collide more often

Question 5

if you increase the temperature a _____ proportion of molecules will have at least the Ea and be able to react

Answer 5

greater

Question 6

how does increased temperature change boltzmann distribution curve

Answer 6

pushes it over to the right

Question 7

how does increasing concentration affect reaction rate

Answer 7

speeds up reaction

Question 8

why does increasing concentration of reactants speed up reaction

Answer 8

particles closer together
collide more frequently
more collisions = more chances to react

Question 9

how does increasing pressure affect reaction rate

Answer 9

speeds up reaction

Question 10

why does increasing pressure speed up reaction rate

Answer 10

particles closer together

more chance of sucessful collisions

Question 11

why doe catalysts speed up reactions

Answer 11

lower the Ea
provide different way for bonds to be broken and remade
Ea lower more particles have enough energy to react