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Flashcards in C2E - How Can We Make Fertiliser Deck (24):
0

what kind of reaction is the Haber Process ?

Reversible

1

What is the equation for the Haber Process ?

Nitrogen + Hydrogen = Ammonia

2

Where is the nitrogen obtained from ?

The air

3

Where is the hydrogen obtained from ?

The cracking of oil fractions or natural gas

4

The reaction us reversible so what does that mean ?

Not all of the hydrogen and nitrogen will convert to ammonia

5

What happens to the nitrogen and hydrogen which don't react ?

They are recycled and passed through again

6

What are the industrial conditions needed for the Haber process ?

High Pressure (200 atmospheres)
Temperature (450c)
Catalyst (Iron)

7

Why must there be a compromise with the Haber process ?

Because it's reversible

8

What condition favours the forward reaction ?

High pressures

9

What will high pressures do ?

Increase the percentage yield of ammonia

10

What do high temperatures favour ?

The reverse reaction

11

What will decrease the percentage yield of ammonia ?

High temperatures

12

Why do manufactures not use low temperatures then ?

It will mean slow reaction rates

13

What is 450c and why ?

The optimum temperature because it gives a fast reaction rate and a reasonable percentage yield

14

What does the iron catalyst do ?

Makes the reaction go faster which will get it to equilibrium proportions more quickly

15

Does the catalyst actually effect the position of equilibrium ?

No

16

What would happen if a catalyst wasn't present ?

You'd have to raise the temperature more which will decrease the percentage yield

17

Production cost depends on 5 factors. What are they ?

Price of energy
Cost of raw materials
Labour costs
Plant costs
Rate of production

18

The higher the temperature the higher the ?

Cost

19

How would a company reduce the cost of raw materials ?

Recycling any un reacted materials

20

What is one way of reducing labour costs ?

Using automation instead of people

21

Explain the plant costs ?

Equipment that needs to withstand higher pressure will cost more than equipment that needs to withstand atmospheric pressure

22

How can cost be kept down on rate of production?

Using a catalyst

23

Optimum conditions are what ?

Those that give the lowest production cost