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This question is about fertilisers - AQA - GCSE Chemistry - Question 5 - 2021 - Paper 2

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This question is about fertilisers. Some fertilisers are described as NPK fertilisers because they contain three elements needed for healthy plant growth. Which tw... show full transcript

Worked Solution & Example Answer:This question is about fertilisers - AQA - GCSE Chemistry - Question 5 - 2021 - Paper 2

Step 1

Which two compounds each contain two of these elements?

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Answer

The two compounds that each contain two of the required elements are:

  • Ammonium phosphate
  • Potassium nitrate

Step 2

Name the soluble salts produced when calcium phosphate reacts with:

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Answer

When calcium phosphate reacts with:

  • Nitric Acid: The soluble salt produced is calcium nitrate.
  • Phosphoric Acid: The soluble salt produced is calcium dihydrogen phosphate.

Step 3

Evaluate the two methods for producing a large mass of ammonium sulfate.

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Answer

The industrial process is generally more efficient because it operates on a larger scale and is a continuous process, allowing for larger batches to be produced quickly. This method ensures a consistent production without the need for repeated setups.

In contrast, the laboratory method is more suited for smaller quantities and involves more manual steps, including cooling and filtration, which can be more time-consuming. However, it's beneficial for educational purposes or small-scale production.

A reasoned judgement might conclude that for large-scale production, the industrial method is preferable due to its efficiency and continuous nature.

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