Chemistry 10.4.4

Question 1

Compounds Containing ___, ___, & ___ are Used as Fertilisers to Increase Crop Yields.

Answer 1

Nitrogen, Potassium, Phosphorus.

Question 2

What are ‘NPK Fertilisers’?

Answer 2

NPK Fertilisers are Formulations Containing Appropriate Ratios of all 3 Elements:

-Nitrogen.

-Potassium.

-Phosphorus.

Question 3

Explain the Benefits of the 3 Elements Used in NPK Fertilisers? (3)

Answer 3

-Nitrogen: Promotes Healthy Leaves.

-Potassium: Promotes Growth, Healthy Fruit & Flowers.

-Phosphorus: Promotes Healthy Roots.

Question 4

What is the Main Advantage of Artificial Fertilisers, Such As NPK Fertilisers, Over Natural Fertilisers?

Answer 4

They can be Designed for Specific Needs.

Question 5

Fertiliser Compounds Contain the Following Water Soluble Ions: (2)

Answer 5

-Ammonium Ions, NH4+, & Nitrate Ions, NO3-, which are Sources of Soluble Nitrogen.

-Phosphate Ions, PH4 3-, Which are a Source of Soluble Phosphorous.

Question 6

Ammonia is an ___ Substances, & so Neutralises ___, Producing a ___ & ___.

Answer 6

Alkaline, Acid, Salt, Water.

Question 7

What does Ammonia Undergo to Produce Nitric Acid? What is the Formula of Nitric Acid?

Answer 7

Oxidation. HNO3.

Question 8

The Earth’s Crust Contains Useful ___, which are Useful Raw Materials for Making Fertilisers.

Answer 8

Minerals.

Question 9

What do ‘Phosphate Rocks’ in the Earth’s Crust Contain? (2)

Answer 9

-Potassium Chloride.

-Potassium Sulfate.

Question 10

Phosphate Rock itself is ___ in Water. It is Usually Reacted with ___ to Produce Useful Compounds with Water Soluble Compounds.

Answer 10

Insoluble, Acid.

Question 11

What is Produced when Phosphate Rock Reacts with Nitric Acid? (2)

Answer 11

-Phosphoric Acid.

-Calcium Nitrate.

Question 12

What is Produced when Phosphate Rock Reacts with Sulfuric Acid? (2)

Answer 12

-Calcium Phosphate.

-Calcium Sulfate.

Question 13

What is Produced when Phosphate Rock Reacts with Phosphoric Acid? (1)

Answer 13

Calcium Phosphate.