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Northern IrelandChemistry

A2 2 Analytical, Transition Metals, Electrochemistry 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.

How are concentrations and amounts found accurately by titration and analysis?

Redox titrations using potassium manganate(VII) and iodine-thiosulfate, the calculations involved, colorimetry for coloured ions, and the planning and evaluation of quantitative analysis with attention to uncertainty.
A CCEA A-Level Chemistry answer on quantitative analysis, covering redox titrations with potassium manganate(VII) and iodine-thiosulfate, the associated calculations, colorimetry for coloured ions, and the planning and evaluation of analysis with uncertainty.
12 min answer →

How do chromatography and NMR separate and identify the parts of a molecule?

The principles of chromatography including thin-layer and gas chromatography and the use of Rf values, and the principles of nuclear magnetic resonance spectroscopy including chemical shift, the number of environments, integration and spin-spin splitting.
A CCEA A-Level Chemistry answer on chromatography and NMR, covering the principles of thin-layer and gas chromatography with Rf values, and the principles of nuclear magnetic resonance including chemical shift, the number of environments, integration and spin-spin splitting.
10 min answer →

How do electrode potentials predict the direction of redox reactions?

Standard electrode potentials and the standard hydrogen electrode, the electrochemical series, calculating cell potentials, using electrode potentials to predict the feasibility of redox reactions, and the chemistry of electrochemical cells and fuel cells.
A CCEA A-Level Chemistry answer on electrode potentials, covering the standard hydrogen electrode and standard electrode potentials, the electrochemical series, calculating cell potentials, using electrode potentials to predict the feasibility of redox reactions, and the chemistry of electrochemical cells and fuel cells.
10 min answer →

How are organic molecules built in steps, and what are polymers?

Multi-step organic synthesis and reaction pathways, choosing reagents and conditions and improving purity and yield, addition and condensation polymers including polyesters and polyamides, and the disposal and biodegradability of polymers.
A CCEA A-Level Chemistry answer on organic synthesis and polymers, covering multi-step reaction pathways and the choice of reagents and conditions, methods of improving purity and yield, addition and condensation polymers including polyesters and polyamides, and the disposal and biodegradability of polymers.
10 min answer →

What gives transition metals their colour, variable oxidation states and catalysis?

The characteristic properties of transition metals, variable oxidation states, the formation and shapes of complex ions, ligand substitution, the origin of colour from d-orbital splitting, and the catalytic behaviour of transition metals.
A CCEA A-Level Chemistry answer on transition metals, covering their characteristic properties, variable oxidation states, the formation and shapes of complex ions, ligand substitution, the origin of colour from d-orbital splitting, and their catalytic behaviour.
10 min answer →