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Chemistry - Module 7 > The Haber Process & Nitrogen Fixation > Flashcards

The Haber Process & Nitrogen Fixation Flashcards

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1
Q

What are the feedstocks for the Haber Process?

A

Nitrogen and Hydrogen

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2
Q

How is the hydrogen obtained?

A

By cracking chemicals in natural gas using steam

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3
Q

Why can’t the Haber Process reach equilibrium?

A

Because the gases don’t stay in the reaction vessel long enough

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4
Q

What is the symbol equation for the Haber Process?

A

N2 + 3H2 2NH3 (+heat)

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5
Q

What is the pressure for the Haber Process?

A

200 atmospheres

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6
Q

What is the temperature for the Haber Process?

A

450 degrees

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7
Q

What is the catalyst used in the Haber Process?

A

Iron

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8
Q

What is most of the ammonia produced used for?

A

Fertilisers

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9
Q

What is a positive impact of the use of fertilisers?

A

They increase crop yield (helps to feed more people)

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10
Q

What is a negative impact of the use of fertilisers?

A

When used in large amoubts, they can pollute water supplies and cause eutrophication

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11
Q

What are 3 other uses of ammonia?

A

Used to manufacture plastics, explosives and pharmaceuticals

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12
Q

What do living organisms use the fix nitrogen at room temperature and pressure?

A

Biological catalysts called enzymes

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13
Q

Why would chemists want to make catalysts that mimic these enzymes?

A

Because this would mean that nitrogen fixation would be cheaper and more efficient

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14
Q

Will the raw materials involved in Nitrogen Fixation run out?

A

Hydrogen - Yes (comes from fossil fuels)

Nitrogen - No (comes from the air)

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15
Q

How good is the atom economy of Nitrogen Fixation?

A

All the products are used up, so it is very good

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16
Q

How are waste products dealt with?

A

There are no waste products because all the chemicals are recycled

17
Q

What are the energy costs?

A

Losts of energy is used to keep the reaction at 450 degrees and 200 atmospheres

18
Q

How does Nitrogen Fixation effect the environment?

A

Fertilisers made from ammonia can cause eutrophication and water pollution

19
Q

What are the health and safety risks involved in nitrogen fixation?

A

The high temperatures and pressures can be dangerous to work with

20
Q

How does nitrogen fixation effect society?

A

Making ammonia can help food production

21
Q

It nitrogen fixation profitable?

A

Yes because making ammonia makes a lot of money industrially

Chemistry - Module 7 (10 decks)

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