Haber Process & NPK Fertilisers (AQA GCSE Chemistry): Quizzes

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Fertilisers
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Which three elements do NPK fertilisers provide to plants?

Nitrogen, phosphorus, potassium

Why can't plants absorb nutrients directly from phosphate rocks?

Phosphate rocks are insoluble

What is the chemical formula of the phosphate ion?

PO43\text{PO}_4^{3-}

What must be done to phosphate rocks to make them usable by plants?

Treat them with acids

What product is formed when phosphoric acid reacts with ammonia?

Ammonium phosphate

Why must fertiliser compounds be soluble?

So they dissolve for spraying solutions

Which soluble compound can be used directly as a potassium fertiliser?

Potassium chloride (KCl\text{KCl})

What is the purpose of the Haber process in fertiliser production?

To make ammonia from nitrogen & hydrogen

Why is the integrated manufacturing process efficient?

Products become raw materials for next step

What is the formula for calculating percentage by mass of an element?

mass of elementformula mass×100%\frac{\text{mass of element}}{\text{formula mass}} \times 100\%

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