Fertilisers

Question 1

What are the 3 essential elements needed by plants?

Answer 1

• Nitrogen
• Phosphorus
• Potassium

Question 2

What are the symptoms of nitrogen deficiency in plants?

Answer 2

• Poor growth
• Yellow leaves

Question 3

What are the symptoms of phosphorus deficiency?

Answer 3

• Poor root growth
• Discoloured leaves

Question 4

What are the symptoms of potassium deficiency?

Answer 4

• Poor fruit growth
• Discoloured leaves

Question 5

What are fertilisers?

Answer 5

substances that replace the elements used by plants as they grow

Question 6

In what form can plants absorb elements in fertilisers?

Answer 6

water-soluble

Question 7

What is the water-soluble form of nitrogen?

Answer 7

• Nitrate ions
• Ammonium ions

Question 8

What is the water-soluble form of phosphorus?

Answer 8

phosphate ions

Question 9

What is the water-soluble form of potassium?

Answer 9

potassium ions

Question 10

What are NPK fertilisers?

Answer 10

Fertilisers that provide nitrogen, phosphorus and potassium in water-soluble compounds

Question 11

What does the Haber process do?

Answer 11

manufactures ammonia from nitrogen and hydrogen

Question 12

What is the balanced symbol equation for the Haber process?

Answer 12

N2(g) + 3H2(g) ⇌ 2NH3(g)

Question 13

How many tonnes of ammonia are manufactured in the world each year?

Answer 13

150 million

Question 14

What are the raw materials needed for the Haber process?

Answer 14

• Air
• Natural gas
• Steam

Question 15

How is nitrogen sourced for the Haber process?

Answer 15

manufactured by the fractional distillation of liquified air

Question 16

How is hydrogen sourced for the Haber process?

Answer 16

reacting natural gas with steam

Question 17

What are the compounds found in fertilisers?

Answer 17

• Ammonium nitrate – NH4NO3
• Ammonium sulfate – (NH4)2SO4
• Ammonium phosphate – (NH4)3PO4
• Potassium nitrate – KNO3