Pre-university sciences
Chemistry
Pre-university chemistry teaches how atoms and molecules behave and react. It is the base for biochemistry and pharmacology, which a psychiatrist later uses every day when prescribing medicines.
Depth by stage, Pre-U → Consultant (details)
What is it?
Chemistry at school and pre-university level covers the structure of atoms, how chemical bonds form, the behaviour of acids and bases, reaction rates and equilibrium, and organic chemistry, the chemistry of carbon compounds that make up living things and most medicines.
It is one of the two sciences, with biology, that almost every medical school requires. Students often find organic chemistry the hardest part, but it is also the part that matters most later.
In medical school, chemistry quietly turns into biochemistry (how the body uses and makes molecules) and pharmacology (how drugs act).
Why does a psychiatrist need it?
Psychiatric medicines such as antidepressants, antipsychotics and lithium are chemicals. Whether a drug crosses into the brain, how long it lasts, and why some interact dangerously all rest on chemistry: solubility, pH, binding and metabolism. Lithium, for example, is a simple salt whose blood level must be kept in a narrow range, and understanding that begins with school chemistry.
What level is expected at each stage?
Scale: 1. Aware → 2. Understands → 3. Applies → 4. Masters / Teaches. What the levels mean.
- Pre-UAppliesSolves calculation and reaction questions confidently; strong grades are needed for medical school entry.
- Pre-clinicalUnderstandsUses chemical ideas to understand biochemistry and drug action.
- ClinicalAwareBackground only; resurfaces when interpreting electrolytes and blood gases.
- HousemanshipAwareBackground only, for example in fluid and electrolyte management.
- Medical officerAwareBackground only.
- Psych traineeAwareBasic chemistry supports psychopharmacology: lipid solubility, protein binding, half-life.
- Specialist / consultantAwareBackground knowledge.
What are the key topics?
Physical chemistry
- Atomic structure, electron configuration and the periodic table
- Chemical bonding: ionic, covalent, hydrogen bonds and intermolecular forces
- Moles, concentrations and stoichiometry
- Energetics, reaction rates and catalysts
- Chemical equilibrium and Le Chatelier's principle
Acids, bases and solutions
- pH, strong and weak acids and bases
- Buffers and why blood pH stays stable
- Salts and solubility
- Redox reactions and electrochemistry (outline)
Organic chemistry
- Functional groups: alcohols, amines, carboxylic acids, esters, amides
- Isomerism, including optical isomers (relevant to drugs such as escitalopram)
- Reaction mechanisms at an introductory level
- Polymers and biological molecules
Laboratory and analytical skills
- Titration and practical measurement
- Errors and accuracy in experiments
- Simple instrumental methods (introductory, varies by syllabus)
- Laboratory safety
How is it learned and assessed?
- Lectures, tutorials and practical laboratory sessions
- SPM Chemistry, then matriculation, foundation, STPM or A-level Chemistry examinations
- Practical or school-based assessment components, depending on the programme
Typical textbooks and resources
- Ministry of Education SPM Chemistry textbooks — the core national texts
- STPM Chemistry reference books from Malaysian publishers
- Cambridge International AS & A Level Chemistry coursebook — Cambridge University Press
- Organic Chemistry — Clayden, Greeves and Warren (Oxford University Press); for very keen students, university level
Titles are widely used examples; editions change. Use university libraries or legitimate purchases.
Common questions
Why does a psychiatrist need chemistry?
Because nearly every psychiatric medicine is a chemical whose effect depends on how it dissolves, binds and is broken down. School chemistry is the first step towards understanding doses, side effects and drug interactions.
Is organic chemistry needed for medicine?
Yes. It is part of every pre-university chemistry syllabus and prepares students for biochemistry and pharmacology in medical school.