Module 3 - Rates of Reaction

Question 1

what 3 things do particles need for a reaction to occur

Answer 1

1- to collide
2- activation energy
3- correct orientation

Question 2

why don’t some reactions occur even though particles collide

Answer 2

-they don’t meet other criteria: activation energy, correct orientation

Question 3

describe how temperature affects collisions

Answer 3

-increase in temperature
-particles have more energy
-more frequent collisions
-more of these collisions are over the activation energy
-rate of reaction increases
(inverse for temperature decrease)

Question 4

describe how concentration/pressure affects collisions

Answer 4

-increase in concentration or pressure
-more particles in the same volume
-more particles with greater than the activation energy
-more frequent collisions
-rate of reaction increases
(inverse for concentration/pressure decrease)

Question 5

describe how to calculate the rate of a straight line

Answer 5

1- make a large triangle using your line
2- work out the change in the y axis
3- work out the change in the x axis
4- work out the gradient and add units

Question 6

describe how to calculate the rate of a curved line

Answer 6

1- find the point on the curve
2- draw a straight line that touches the point, and make a large triangle
3- work out the change in the y axis of the triangle
4- work out the change in the x axis of the triangle
5- work out the gradient and add units

Question 7

define initial rate

Answer 7

-calculated by using the beginning of the line (starting t=0) to calculate the rate

Question 8

describe how to calculate the initial rate

Answer 8

1- draw a straight line at time=0
2- work out the change in the y axis
3- work out the change in the x axis
4- work out the gradient and add units