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ScotlandChemistry

Area 2: Organic Chemistry and Instrumental Analysis

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

How do chemists work out the structure of an unknown compound?

Elemental microanalysis to find the empirical formula, mass spectrometry to find the molecular mass and fragmentation pattern, infrared spectroscopy to identify functional groups, and proton and carbon-13 nuclear magnetic resonance spectroscopy to map the carbon-hydrogen framework.
An SQA Advanced Higher Chemistry answer on the experimental determination of structure, covering elemental microanalysis to find the empirical formula, mass spectrometry for the molecular ion and fragmentation, infrared spectroscopy for functional groups, and proton and carbon-13 NMR spectroscopy for the carbon-hydrogen framework, used together to deduce an unknown structure.
15 min answer →

How does the overlap of atomic orbitals explain bonding, shape and colour?

The formation of molecular orbitals from atomic orbitals, sigma and pi bonds, sp, sp2 and sp3 hybridisation and the shapes they give, and how conjugation and chromophores lead to the absorption of visible light and colour in organic molecules.
An SQA Advanced Higher Chemistry answer on molecular orbitals, covering the combination of atomic orbitals into bonding and antibonding molecular orbitals, sigma and pi bonds, sp, sp2 and sp3 hybridisation and molecular shape, and how conjugation and chromophores allow organic molecules to absorb visible light and appear coloured.
13 min answer →

How does a drug molecule produce its effect in the body?

Drugs as molecules that bind to receptors or enzymes, the action of agonists and antagonists, the role of functional groups in binding, structure-activity relationships, and how these ideas guide the design of medicines.
An SQA Advanced Higher Chemistry answer on pharmaceutical chemistry, covering drugs as molecules that bind to receptors and enzymes, the action of agonists and antagonists, the role of functional groups in binding, structure-activity relationships, and how these ideas guide the design and development of medicines.
12 min answer →

Why can two molecules with the same formula behave very differently?

Geometric (cis-trans, E/Z) isomerism arising from restricted rotation about a double bond, optical isomerism arising from chirality, enantiomers and optical activity measured by polarimetry, racemic mixtures, and the importance of stereochemistry in pharmaceuticals.
An SQA Advanced Higher Chemistry answer on stereochemistry, covering geometric (cis-trans and E/Z) isomerism from restricted rotation about a double bond or ring, optical isomerism from chirality, enantiomers and optical activity measured by polarimetry, racemic mixtures, and why stereochemistry matters in pharmaceuticals.
13 min answer →

How do chemists plan a route to make a target organic molecule?

The reactions of the main functional groups including nucleophilic substitution, elimination, oxidation, reduction, condensation and hydrolysis, the use of these reactions to design multi-step synthetic routes, and the assessment of a route by percentage yield, atom economy and hazards.
An SQA Advanced Higher Chemistry answer on synthesis, covering the reactions of the main functional groups (nucleophilic substitution, elimination, oxidation, reduction, condensation and hydrolysis), how these reactions are combined into multi-step synthetic routes, and how a route is assessed by percentage yield, atom economy and hazards.
14 min answer →