Collision Theory

Question 1

What must happen for a reaction

Answer 1

The reacting particles must successfully colide

Question 2

What is a successful reaction

Answer 2

All reactants have changed to products

Question 3

What is a successful collision?

Answer 3

A successful collision happens when the reacting particles have sufdicenr energy

Question 4

What is the activation energy?

Answer 4

The minimum energy rescting particles must have when they collide for the reaction to take place

Question 5

What does increasing the rate of reaction do?

Answer 5

Increase the chance/frequency of successful collisions.

Question 6

What are the four ways od changing a rate of reaction?

Answer 6

Temperature, concentration, surface area and catalyst.

Question 7

What does temperature do to RoR

Answer 7

At a higher temperature the particles have more kinetic energy and move faster.

Question 8

What does concentration do to RoR (pressure)

Answer 8

At a higher pressure there are more reacting particles in the same space

Question 9

What does concentration do to RoR

Answer 9

Increasing the concetration increases the number of reacting particles

Question 10

What does surface area do to RoR?

Answer 10

Breaking a solid into a smaller pieces increases the surface area.

Question 11

What does a catalyst do to RoR

Answer 11

Adding a catalyst to the reaction lowers the activation energy of the reaction.
Without being used up itself in the reaction

Question 12

What are rate graphs used for?

Answer 12

A graph is used to follow the course of reaction

Question 13

What can comparing graphs do?

Answer 13

Show the difference in the rates of simliar reactions

Question 14

What is the rate of reaction?

Answer 14

How quickly reactants are used up or products are produced

Question 15

What is the equation for calculating the mean rate of reaction?

Answer 15

Mean rate= change in quantity of product or reactant divided by time taken

Question 16

What is the unit for rate of reaction in a reaction involving a change in mass?

Answer 16

G/s

Question 17

What is the unit for rate of reaction involving a vhange in volume?

Answer 17

Cm3/s
(Cubed)

Question 18

What is activation energy

Answer 18

The minimum amount of energy colliding particles have to have before a reaction will take place

Question 19

What effect does increasing concentration hage on the rate of reaction

Answer 19

Increases

Question 20

Why does increasing concentration habe this effect

Answer 20

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

Question 21

What effect does increasing pressure have on the rate of reaction

Answer 21

Increases

Question 22

Why does increasing the pressure have this effect?

Answer 22

Less space between particles mean more frequent collisions

Question 23

What effect does increasing the surfsce area have on rate of reaction?

Answer 23

Increases

Question 24

Why does increasing surface area have this effect?

Answer 24

More reactant particles are exposed are able to collide lesding to more frequent collisions

Question 25

What effect does temperature have on the rste of reaftion?

Answer 25

Increases

Question 26

Why dows increasing the temperature have this effect?

Answer 26

Particles move faster and particles have the same activation energy so more collisions in a result

Question 27

What is a catalyst?

Answer 27

A substance that increases the rate of reaction but is not used up in the reaction.

Question 28

How do catalysts increase the rate of resction

Answer 28

Lowers the activation energy of the reaction so more collisions result in a reaction