Haber Process

Question 1

What needs to happen for two molecules to react with each other?

Answer 1

Collide with enough energy to react.

Question 2

Temp. of reaction rose from 20-25C. What type of reaction is it?

Answer 2

Exothermic

Question 3

What is meant by BENDOMEX?

Answer 3

Bendo-endothermic needs more energy to break bonds than released when making them.
Mex-exothermic needs more energy to make bonds that released when breaking them.

Question 4

Give an example of endothermic reaction.

Answer 4

Photosynthesis

Question 5

What does = with arrows on mean?

Answer 5

Reversible reaction.

Question 6

How can you tell in a graph when the reaction was the fastest?

Answer 6

Steepest line

Question 7

What is an enzyme?

Answer 7

Biological catalyst

Question 8

What is made in the Haber process?

Answer 8

Ammonia

Question 9

What do we call the minimum energy molecules need to have in order to react?

Answer 9

Activation energy

Question 10

When does the reaction finish on a graph?

Answer 10

When it first reaches the top and makes a straight line.

Question 11

What is the equation for the Haber process?

Answer 11

N2+3H2=2NH3

Question 12

Explain why increasing surface area of a solid increases the rate of reaction.

Answer 12

There is a higher chance of collisions.

Question 13

What pressure do we choose for Haber process and why?

Answer 13

250atm because a high pressure increases rate and yield.

Question 14

What temperature do we choose for the Haber process and why?

Answer 14

400C, medium temperature because high temp increases rate of reaction but decreases yield.

Question 15

Where does the Nitrogen come from in the Haber process?

Answer 15

Air

Question 16

Give an example of an exothermic reaction.

Answer 16

Displacement
Neutralisation
Combustion

Question 17

Where does the hydrogen come from for the Haber process.

Answer 17

Natural gas

Question 18

How could I prove a reaction is exothermic?

Answer 18

Measure temperature
React
Measure again
If temp has risen it is an exothermic reaction

Question 19

How do you find out loss of mass in first 100s?

Answer 19

Go up to the line at 100s then across.

Question 20

Diagram for endothermic reaction?

Answer 20

Reactants lower than products. Energy on the side.

Question 21

How would you sketch a line on a graph to show what happens with a higher temp?

Answer 21

Steeper but reaches the same maximum.

Question 22

Why does increasing pressure increase rate of reaction?

Answer 22

There is more energy so particles move faster so there are more collisions.

Question 23

Why does adding a catalyst increase the rate of reaction?

Answer 23

Lowers activation energy so there are more successful collisions.

Question 24

What catalyst do we use for Haber process and why?

Answer 24

Iron because it increases rate without having an effect on the yield.

Question 25

List 4 factors which can increase the rate of a chemical reaction.

Answer 25

Increase temperature.
Increase pressure (only gas.)
Increase surface area.
Add catalyst.