LC Chemistry study guide
LC Chemistry · Work through your exam, one topic at a time.
Leaving Certificate Chemistry is the Irish senior-cycle subject examined by the State Examinations Commission and commonly taken over two years, with Higher and Ordinary level papers. It suits students who want a laboratory-based science qualification for university entry in science, medicine, pharmacy, engineering or education, and it also stands alone as a grounding in chemical reasoning. The LC Chemistry study guide has 12 sections and about 3,349 words.
01Periodic Table and Atomic Structure
This domain tests the evidence for atomic structure, electron configuration and the periodic trends that follow from nuclear charge and shielding. Expect definitions, isotope calculations, orbital diagrams and explanations of trends rather than simple recall.
293 words, about 1 min02Chemical Bonding and Molecular Structure
This domain examines why substances have particular structures and properties: ionic lattices, covalent molecules, polar bonds, molecular shapes and intermolecular forces. The exam often asks you to predict a shape and then explain polarity or boiling point.
316 words, about 2 min03Stoichiometry
This domain tests quantitative relationships in reactions: the mole, molar mass, limiting reagents, percentage yield, empirical formulas and solution calculations. You must show a clear unit-bearing calculation.
283 words, about 1 min04Formulas and Equations
This domain tests writing correct chemical formulas, balancing equations, including state symbols, and constructing ionic equations. Accuracy in formulas and charges is essential because every later calculation depends on the equation.
256 words, about 1 min05Volumetric Analysis and Acid-Base Chemistry
This domain tests titration calculations, standard solutions, indicator choice and acid-base definitions. The exam expects precise burette readings, correct mole ratios and a clear calculation from concordant titres.
287 words, about 1 min06Gases
This domain tests the gas laws, the ideal gas equation, kinetic theory and partial pressures. Questions often combine a gas calculation with stoichiometry or ask you to explain deviations from ideal behaviour.
266 words, about 1 min07Solutions and Colligative Properties
This domain tests concentration, solubility and colligative properties: vapour pressure lowering, boiling point elevation, freezing point depression and osmotic pressure. These properties depend on the number of dissolved particles, not their identity.
265 words, about 1 min08Thermochemistry and Chemical Kinetics
This domain tests enthalpy changes, calorimetry, Hess's law, bond energies and reaction rates. You must distinguish thermodynamic favourability from kinetic rate, and handle signs correctly.
288 words, about 1 min09Equilibrium and Le Chatelier's Principle
This domain tests dynamic equilibrium, equilibrium constants and how systems respond to changes. The exam may ask you to write Kc, calculate it, or predict the direction of shift and explain the effect on yield.
281 words, about 1 min10Organic Chemistry
This domain tests homologous series, functional groups, IUPAC naming, isomerism, reaction types and simple tests. The exam expects you to identify a functional group, name a compound and predict a reaction product or test result.
266 words, about 1 min11Electrochemistry and Redox
This domain tests oxidation numbers, redox identification, electrochemical cells, standard electrode potentials and electrolysis. You must track electrons and charge carefully; signs and electrode names are frequent sources of lost marks.
261 words, about 1 min12Laboratory Practicals and Experimental Techniques
This domain tests safe and accurate experimental work: separation and purification, preparation of solutions, titration technique, calorimetry, yield calculations and identification of errors. Questions often ask why a step is done, not just what is done.
287 words, about 1 min