Rate of Reaction

Question 1

what is the rate of a reaction

Answer 1

how quickly reactants are used up or products are produced

Question 2

what is a catalyst

Answer 2

a substance that increases the rate of reaction but isn’t used up in the reaction

Question 3

how do catalysts increase the rate of reaction

Answer 3

lower the activation energy, by providing an alternate pathway, so more collisions occur

Question 4

what effect does temperature increasing have on the rate of reaction and why

Answer 4

-Increases
-because the particles move faster, leading to more frequent collisions, more energy - more successful collisions

Question 5

what effect does increasing surface are have on the rate of reaction and why

Answer 5

-Increases
-more reactant particles exposed and able to collide, leading to more frequent collisions

Question 6

why does increasing pressure increase the rate of reaction

Answer 6

less space between particles means more frequent collisions

Question 7

what affect does increasing pressure have on the rate of reaction

Answer 7

Increases

Question 8

why does increasing concentration increase rate of reaction

Answer 8

more reactant particles in the same volume lead to more frequent collisions

Question 9

what effect does increasing concentration have on the rate of reaction

Answer 9

Increases

Question 10

what is unit for rate of reaction in a reaction involving a change in volume

Answer 10

cm3/s

Question 11

unit for rate of reaction in a reaction involving a change in mass

Answer 11

g/s

Question 12

what is the equation for calculating the mean rate of reaction

Answer 12

mean rate = change in quantity of product or reactant (divided by) time taken