eymmcl2003

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eymmcl2003

What has led to the need for more efficient food

production?

Increasing world population

answer

1

eymmcl2003

Name the three essential elements required for healthy plant growth

Nitrogen (N)

Phosphorus (P)

Potassium (K)

2

answer

eymmcl2003

Calculate the percentage mass of nitrogennitrogen in NH4 NO3

Formula mass = 14 + 4 + 14 +(3x16) = 80% N = 28/ 80 x 100 = 35%

3

answer

eymmcl2003

How are some plants able to convert nitrogen in the

air into nitrogen compounds?

They have bacteria in root nodules

(These plants are called the legumes

ie peas, beans & clover)

4

answer

eymmcl2003

Why are fertilisers added to the soil?

To replace nutrients/essential

elements /nitrogen,

potassium or phosphorus

5

answer

eymmcl2003

What effect can artificial fertilisers have on lochs

and rivers?

Make them lifeless

6

answer

eymmcl2003

Which of the following compounds would be suitable fertilisers?

Copper chloride, ammonium nitrate, calcium phosphate

Ammonium nitrate - contains nitrogen / soluble

Copper chloride - does not contain essential elements

Calcium phosphate - is insoluble

7

answer

eymmcl2003

What happens to the What happens to the nitrogen and oxygen in nitrogen and oxygen in

the air during a the air during a lightning storm?lightning storm?

They join together to produce nitrogen dioxide

which dissolves in water and when rain falls nitrogen is

added to soil.

8

answer

eymmcl2003

Name the process which produced ammonia (NH3)

Haber Haber ProcessProcess

9

answer

eymmcl2003

Name the catalyst used in the Haber process?

IroIronn

10

answer

eymmcl2003

Why is a high temperature not used in the Haber

process?? The ammonia The ammonia

produced produced decomposes back decomposes back into hydrogen and into hydrogen and

nitrogennitrogen

11

answer

eymmcl2003

Name the two gases which react together in

the Haber process

NitrogenNitrogen and hydrogenhydrogen

12

answer

eymmcl2003

Name the two types of compounds which can be used to make ammonia in

the lab.

An ammonium compound and An ammonium compound and an alkalian alkali

eg. Ammonium chloride and potassium hydroxide

orammonium carbonate and soda lime

13

answer

eymmcl2003

What colour does ammonia turn damp

pH paper?

BlueBlue/purplepurple(It is an alkaline

substance)

14

answer

eymmcl2003

Describe the appearance of

ammonia.

Colourless gas, pungent smell.

It is also soluble in water and turns damp pH

paper/universal indicator blue

15

answer

eymmcl2003

Is nitrogen gas reactive or unreactive?

unreactiveunreactive

16

answer

eymmcl2003

Name the process which produces nitric acid.

Ostwald Ostwald processprocess

17

answer

eymmcl2003

What is formed when nitrogen dioxide

dissolves in water?

Nitric acidNitric acid

18

answer

eymmcl2003

Name the catalyst used in the Ostwald

process.

platinplatinumum

19

answer

eymmcl2003

What does the Ostwald

process produce?

Nitric acid - Nitric acid - HNOHNO33

20

answer

eymmcl2003

Explain why it is not necessary to continue to heat once the Ostwald process has started.

The reaction is

exothermicexothermic(Heat is released

which can be used in the reaction)

21

answer