Year 10 Science · Unit 2 · Lesson 20

Unit Synthesis and Depth Study Preparation

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Learning Goals

Identify the odd one out in groups spanning all four unit themes.
Apply multi-concept reasoning to the Haber process as a synthesis scenario.
Connect reaction type, energy change, rate factors, and environmental impact in one extended response.

Warm Up

Odd one out

Circle the item that does not belong in each group. Then explain why it doesn't fit in the answer column.

#	Group	Odd one out + reason
1	HCl H₂SO₄ NaOH CH₃COOH
2	Temperature Surface area Catalyst pH
3	Synthesis Decomposition Combustion Distillation
4	Haber process Fermentation Electrolysis Enzymatic catalysis
5	Exothermic Endothermic Reversible Ionic

Your Turn

Synthesis scenario: the Haber process

The Haber process (N₂ + 3H₂ ⇌ 2NH₃) is run at 400–500°C, approximately 200 atm pressure, using an iron catalyst. Ammonia is used to make fertilisers including ammonium nitrate (NH₄NO₃) and urea. Fertiliser overuse can lead to nitrate runoff into waterways.

Reaction type What type of reaction is N₂ + 3H₂ ⇌ 2NH₃? Is it reversible? Explain.
Balanced equation Write the balanced symbol equation for the Haber process. Check atom counts.
Energy change Is the forward reaction exothermic or endothermic? How does this affect the temperature trade-off?
Rate factors Identify two factors used in the Haber process to increase rate, and explain each using collision theory.
Environmental impact Describe one environmental impact of fertiliser produced by the Haber process, and one way this can be managed.

Wrap Up

In one sentence, explain why the Haber process is a good example of multi-concept chemistry, one that requires knowledge of reactions, rates, energy, and environment all at once.