Starter quiz
- Name the industrial process used to make ammonia.
- 'Haber process' ✓
- Which of the following are properties of ammonia?
- colourless gas ✓
- dissolves in water to form an acidic solution
- dissolves in water to form an alkaline solution ✓
- high boiling point
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- Which of the following shows ammonia?
- Nitrogen reacts with hydrogen to form ammonia. Which of the following shows this balanced chemical reaction?
- N₂ + 3H₂ ⇌ 2NH₃ ✓
- 2N₂ + 3H₂ ⇌ 2NH₃
- N₂ + H₂ ⇌ 2NH₃
- N₂ + 2H₂ ⇌ 2NH₃
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- When the symbol ⇌ is used in an equation it means that the reaction is ______.
- 'reversible' ✓
- What happens to the unreacted hydrogen and nitrogen gases used in the Haber process?
- They are recycled back into the process. ✓
- They are released into the atmosphere.
- All the nitrogen and hydrogen are used in the reaction.
- They form other products.
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Exit quiz
- Match the following terms to the correct definition.
- fertiliser⇔Mixture of soluble chemicals added to soil to replace mineral ions. ✓
- eutrophication⇔Process where nutrients accumulate in body of water, removing oxygen. ✓
- batch process⇔Manufacturing process made of discrete stages or steps. ✓
- continuous process⇔Manufacturing process where a product is constantly produced. ✓
- feedstock⇔A raw material used to provide reactants for an industrial reaction. ✓
- NPK fertilisers contain ______, phosphorus and potassium compounds to promote plant growth.
- 'nitrogen' ✓
- Which of the following are uses of nitrogen in plants?
- chlorophyll production ✓
- protein synthesis ✓
- respiration
- photosynthesis
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- Which acid reacts with ammonia to make ammonium nitrate, NH₄NO₃?
- 'nitric acid' ✓
- Put the steps involved in making pure, dry salt crystals of ammonium sulfate from ammonia and sulfuric acid in the lab in the correct order, starting by adding your reactants to a suitable container.
- 1⇔A known volume & concentration of ammonia solution are added to a conical flask.
- 2⇔From a burette, a known concentration of acid is added to be fully neutralised.
- 3⇔A neutral solution forms, and is transferred to an evaporating dish.
- 4⇔The solution is warmed slightly, then left to cool and crystallise.
- 5⇔Any remaining solvent is remove by drying crystals in an oven or dabbing dry.
- Which of the following are used in the laboratory production of ammonia salts, but not in the industrial production of ammonia salts?
- evaporate water from the crystals
- react ammonia and acid in a conical flask ✓
- collect dry crystals of ammonium salts
- react an acid with ammonia using titration ✓
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Worksheet
Presentation
Video
Lesson Details
Key learning points
- Fertilisers contain nitrogen, phosphorus and potassium compounds to promote plant growth.
- Ammonia is a feedstock for manufacture of fertilisers, explosives, plastics, dyes and cleaning products.
- Ammonia can be used to manufacture ammonium salts and nitric acid.
- The laboratory preparation of ammonium salts is not the same as the industrial preparation.
Common misconception
Ammonia and ammonium are the same thing.
Carefully compare the different chemical formulae, structures, and distinct uses in fertilisers vs. industrial applications. Use visual aids to reinforce these differences.
Keywords
Fertiliser - a mixture of soluble chemicals added to soil that replace the mineral ions needed by plants, to promote plant growth
Eutrophication - a term used to describe when nutrients accumulate in bodies of water, which results in an increased growth of microorganisms that reduce the oxygen availability in the water
Salt - an ionic compound formed from positive and negative ions electrostatically attracted to each other
Batch process - a manufacturing method made up of discrete stages, rather than a product being constantly produced
Continuous process - a manufacturing method where a product is constantly produced