Equilibria

Question 1

What is a catalyst

Answer 1

A substance that increases the rate of reaction, but is chemically unchanged at the end of the reaction

Question 2

What is ∆H

Answer 2

Change in heat energy of a reaction

Question 3

Wha is a reversible reaction

Answer 3

A reaction where bot the forward and the backward reaction can happen

Question 4

When is dynamic equilibrium reached

Answer 4

The rate of the forward reaction equals the rate of the backward reaction

So there is no overall change in concentration

Question 5

In the diffusion experiment with HCL and Ammonia in a tube, why is the ring nearer to the HCL side

Answer 5

Because HCL has a higher Mr than NH4 so the NH4 will travel faster and therefore further

Question 6

Give 5 ways to speed up the rate of the reaction

Answer 6

Surface Area

Catalyst

Temperature

Concentration

Pressure

Question 7

Give an example of a catalyst

Answer 7

Magnate Triphosphate

Question 8

What reactions are exothermic

Answer 8

Neutralisation

Combustion

Question 9

For a exothermic reaction is it:
∆H -Ve
∆H +Ve

Answer 9

∆H -Ve

Question 10

What is a energy level diagram

Answer 10

Graph with energy on y axis

One straight arrow showing ∆H

Question 11

What is a reaction profile diagram

Answer 11

Curved arrow showing the activation energy required

Question 12

Is bond breaking endothermic or exothermic

Answer 12

Endothermic

Question 13

Making bonds =

Answer 13

Exothermic

Question 14

What is the mole equation

Answer 14

m = mr x n

m is mass

n is moles

Question 15

In a mole question what do you ignore when counting the Mr

Answer 15

The big numbers

Only for ratios