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6.1 Improving processes and products

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Question 21
F

A farmer wants to use the fertiliser with the highest percentage by mass of nitrogen.

Use the equation: percentage of nitrogen = (total ArA_{r}Ar​ of nitrogen atoms ÷\div÷ MrM_{r}Mr​) × \times\,× 100

Relative atomic mass (ArA_{r}Ar​): H = 1.0 C = 12.0 N = 14.0 O = 16.0 S = 32.1 K = 39.1

Which fertiliser should the farmer choose?

[1]
A

Ammonium nitrate, NH4NO3\mathrm{NH_{4}NO_{3}}NH4​NO3​

B

Ammonium sulfate, (NH4)2SO4\mathrm{(NH_{4})_{2}SO_{4}}(NH4​)2​SO4​

C

Potassium nitrate, KNO3\mathrm{KNO_{3}}KNO3​

D

Urea, (NH2)2CO\mathrm{(NH_{2})_{2}CO}(NH2​)2​CO

Markscheme

6.1 Improving processes and products Questions

  1. GCSE
  2. /Chemistry
  3. /6.1 Improving processes and products

136 exam-style questions on OCR GCSE Chemistry 6.1 Improving processes and products, covering 6.1.1 Extracting metals industrially and by electrolysis, 6.1.2 Life cycle assessment and recycling, 6.1.3 Biological methods of metal extraction, 6.1.4 The Haber process and the production of fertilisers, 6.1.5 Alloys and their uses, 6.1.6 Corrosion and its prevention, 6.1.7 Comparing and selecting materials, and 6.1.8 Industrial conditions, rate and position of equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.

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