fertilisers Flashcards

1
Q

what elements do growing plants require in there fertiliser?

A

nitrogen, phosphorus and potassium

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2
Q

what are fertilisers

A

substances which restore elements essential for healthy plant growth to the soil

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3
Q

What compounds are required to produce soluble nitrogen??

A

ammonia and nitric acid

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4
Q

what does nitrogen contain that can be used for fertilisers?

A

salts

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5
Q

what are some of the properties of ammonia

A

Pungent, clear and a colourless gas which dissolves in water to produce an alkaline solution

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6
Q

What process is used to produce the ammonia required for fertiliser production?

A

Haber

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7
Q

Why is moderate temperature used for production of ammonia in the Hager process

A

This is because when the temperature is to low the reaction is too slow but if too high ammonia will break up to form nitrogen and hydrogen quickly

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8
Q

What process is carried out under high pressure

A

Haber

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9
Q

What kind of catalyst is used in the havre process to increase rate of reaction

A

An iron catalysts

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10
Q

What is the starting material for the commercial production of nitric acid in the Ostwald process

A

Ammonia

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11
Q

What does the Ostwald process use to produce nitric acid

A

Ammonia oxygen and water

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12
Q

What kind of catalyst is used in the Ostwald process

A

Platinum catalyst

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13
Q

How to test for potasium in fertiliser?

A

Flame test

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14
Q

Equation for industrial production of ammonia

A

N2 + H2 (reversable sign) NH3

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