The Reaction is Reversible, So There’s a Compromise to be Made: Flashcards Preview

CGP GCSE Chem > The Reaction is Reversible, So There’s a Compromise to be Made: > Flashcards

Flashcards in The Reaction is Reversible, So There’s a Compromise to be Made: Deck (10)
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1
Q

What do higher pressures favour?

A

The forward reaction

2
Q

Why is the pressure set as high as possible?

A

To give the best % yield, without making the plant too expensive to build - hence 200 atmospheres operating pressure

3
Q

The forward reaction is Exothermic - what does this mean?

A

That increasing the temp will actually move the equilibrium the wrong way - away from ammonia and towards N2 and H2

4
Q

The yield of ammonia would be ….. at lower temps

A

Greater

5
Q

What is the trouble?

A

Lower temps mean a slower rate of reaction - increase temp anyway to get much faster rate of reaction

6
Q

What is the 450°C a compromise between?

A

The maximum yield and speed of the reaction

7
Q

The ammonia is formed as a gas, but as it cools in the condenser…

A

It liquifies and is removed

8
Q

How is nothing wasted?

A

The unused hydrogen, H2, and nitrogen, N2, are recycled

9
Q

What does the iron catalyst do?

A

Makes the reaction go faster, but doesn’t affect the % yield

10
Q

See diagram page 75

A

Ok

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