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Northern IrelandChemistry

Unit 2 Further Chemical Reactions, Rates and Equilibrium, Calculations and Organic Chemistry

5 dot points across 5 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

Why does iron rust, and how can corrosion be prevented?

The rusting of iron and the conditions needed, and methods of preventing corrosion including barrier methods, galvanising and sacrificial protection.
A CCEA GCSE Chemistry answer on corrosion, covering the rusting of iron, the conditions of water and oxygen needed, and the methods used to prevent corrosion including barrier methods, galvanising and sacrificial protection.
8 min answer →

How does electrolysis split compounds, and what forms at each electrode?

Electrolysis of molten ionic compounds and of aqueous solutions including brine, predicting the products at each electrode, and writing electrode half-equations.
A CCEA GCSE Chemistry answer on electrolysis, covering how molten ionic compounds and aqueous solutions are split by an electric current, the rules for predicting the products at the cathode and anode including the electrolysis of brine, and writing electrode half-equations.
9 min answer →

How is the method of extracting a metal decided by its reactivity?

How the reactivity of a metal determines its extraction method, the extraction of iron by reduction with carbon in the blast furnace, and why reactive metals are extracted by electrolysis.
A CCEA GCSE Chemistry answer on the extraction of metals, covering how a metal's position in the reactivity series sets its extraction method, the reduction of iron oxide with carbon in the blast furnace, and why metals above carbon are extracted by electrolysis.
9 min answer →

How do we rank metals by reactivity, and what are displacement reactions?

The reactivity series of metals, the reactions of metals with water and acid, and displacement reactions of metals with metal salt solutions.
A CCEA GCSE Chemistry answer on the reactivity series, covering how metals are ranked by their reactions with water and acid, the order of the common metals, and how a more reactive metal displaces a less reactive one from its salt solution.
9 min answer →

What are oxidation and reduction in terms of electrons and oxygen?

Oxidation and reduction defined in terms of oxygen and of electrons (OIL RIG), identifying redox in displacement and other reactions, and writing half-equations.
A CCEA GCSE Chemistry answer on redox reactions, covering oxidation and reduction defined by the gain and loss of oxygen and of electrons (OIL RIG), how to identify oxidation and reduction in displacement and other reactions, and how to write half-equations.
9 min answer →