U3-3 - Fertilisers

Question 1

3 elements essential to plants

Answer 1

P, N, K

(phosphorus, nitrogen potassium)

Question 2

Which two properties must a fertiliser have?

Answer 2

1. Soluble in water
2. Contains one or more of P, N, K

Question 3

What type of reactions make synthetic fertilisers?

Answer 3

Neutralisation reactions

Question 4

What type of compounds are synthetic fertilisers?

Answer 4

Salts

Question 5

A salt solution was made. How can a solid salt sample be produced?

Answer 5

Evaporation

(Boil away the solvent)

Question 6

Formula for ammonia

Answer 6

NH₃

Question 7

Describe the properties of ammonia

(smell, hazards, solubility/pH)

Answer 7

Sharp unpleasant smell

Toxic

Dissolves in water to form alkaline solutions

Question 8

This process is used to make ammonia

Answer 8

Haber process

Question 9

This process is used to make nitric acid

Answer 9

Ostwald process

Question 10

Name the chemical made in the Haber process

Answer 10

Ammonia (NH₃)

Question 11

Name the chemical made in the Ostwald process

Answer 11

Nitric acid (HNO₃)

Question 12

Catalyst used in the Haber process

Answer 12

Iron

Question 13

Catalyst used in the Ostwald process

Answer 13

Platinum

Question 14

Equation for the fomation of ammonia (from nitrogen and hydrogen)

Answer 14

N₂ + 3H₂ ⇌ 2NH₃

Question 15

What does ⇌ mean in equations?

Answer 15

Reaction is reversible (goes both ways)