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Topic 5: Separate chemistry 1

3 dot points across 3 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

How do we use moles and titration results to calculate concentrations?

Quantitative analysis: the mole and concentration in mol/dm3, converting between g/dm3 and mol/dm3, the acid-alkali titration core practical, and calculating an unknown concentration from titration results.
A focused answer to Edexcel GCSE Chemistry topic 5 (separate chemistry), covering the mole and the relationship between moles, concentration and volume, converting between g/dm3 and mol/dm3, the acid-alkali titration core practical, and calculating an unknown concentration from titration data using the mole ratio.
10 min answer →

What makes the transition metals distinctive, and how are alloys and corrosion controlled?

Transition metals, alloys and corrosion: the properties of transition metals compared with Group 1, the structure and uses of alloys, the conditions needed for rusting, and methods of preventing corrosion.
A focused answer to Edexcel GCSE Chemistry topic 5 (separate chemistry), covering the typical properties of transition metals compared with Group 1 metals, why alloys are harder than pure metals, common alloys and their uses, the conditions required for iron to rust, and methods of preventing corrosion including barriers and sacrificial protection.
9 min answer →

How do we calculate percentage yield, atom economy and gas volumes?

Yield and gas calculations: percentage yield and why yields are below 100 percent, atom economy and sustainability, and calculating gas volumes using the molar volume of a gas.
A focused answer to Edexcel GCSE Chemistry topic 5 (separate chemistry), covering how to calculate percentage yield and why it is below 100 percent, atom economy and its link to sustainability, and calculating the volume of a gas using the molar gas volume of 24 dm3 per mole at room temperature and pressure.
10 min answer →