Factors affecting Rate

Question 1

what are the 4 factors affecting rate of reaction

Answer 1

surface area
temperature
catalyst
pressure

Question 2

what is collision theory

Answer 2

for particles to react they need to collide with one another with sufficient energy (activation energy)

Question 3

What are the two important factors surrounding reaction

Answer 3

1. the amount of energy each particle has
2. the frequency of collisions they have - more often means overall more successful collisions

Question 4

what happens to reaction rate as temp increases and WHY?

Answer 4

particles gain more energy
which means they
1. have more energy which means they are more likely to have sufficient energy
2. move faster which means the amount of collisions increases

overall leading to higher rate of successful collisions

Question 5

what happens to reaction rate as concentration/pressure increases and WHY?

Answer 5

increase in reaction rate because more particles per unit
which means
collisions are more frequent
therefore greater chance of successful collisions

Question 6

what happens to reaction rate as surface area increases and WHY?

Answer 6

increase because more area means more frequent collisions and thus more successful collisions

Question 7

what is a catalyst

Answer 7

substances that speed up reactions without being used up themselves

Question 8

what does a catalyst do (provide an __________ reaction _______)

Answer 8

provides an alternative reaction pathway

Question 9

how does a catalyst increase reaction rate

Answer 9

lowers amount of activation energy required so there is a higher proportion of successful collisions