P6- The Rate And Extent Of Chemical Change

Question 1

What does the rate of reaction depend on

Answer 1

1) The collision frequency of a reacting particles

2) The energy transferred during a collision

Question 2

What happens to the collision when the frequency is doubled

Answer 2

Doubling the frequency of collisions doubles the rate

Question 3

What do the particles need to be for there to be a successful collision

Answer 3

Particles need to have enough energy for the collision to be successful

Question 4

What is the activation energy

Answer 4

The initial rise in energy represents the energy needed to start a reaction

Question 5

Why is activation energy important

Answer 5

It is the minimum amount of energy that reactants need to collide with each other and react

Question 6

What increases the number of collisions

Answer 6

Factors that increase the number of collisions or the amount of energy particles collide with will increase the rate of reaction

Question 7

What four things does the rate of reaction depend on

Answer 7

1) temperature
2) the concentration of a solution or the pressure of gases
3) the surface area
4) The presence of a catalyst

Question 8

How does temperature increase the rate of reaction

Answer 8

When the temperature is increased the particles move faster
If they’re moving faster, they’re going to collide more frequently
Also the faster they move the more energy they have so more collisions will have enough energy to make the reaction happen

Question 9

Increasing the concentration or pressure increases the rate

Answer 9

It means more particles knocking about in the volume of water

When the pressure of a gas is increased, it means that the same number of particles occupies a smaller volume