15/15 weeks ready · Follows the order of the Egyptian Ministry of Education and Technical Education textbook Chemistry, Third Secondary Year (Grade 12), Chapters 1–3 Transition Elements, Chemical Analysis and Chemical Equilibrium (English and Arabic editions, 2026–2027 printing; the book is one volume for the whole year and has no term marking, Darslab places Chapters 1–3 in Term 1 and keeps Chapter 4 Electrochemistry and Chapter 5 Organic Chemistry for Term 2). All explanations, exercises and quizzes are Darslab’s own.
Term 1Chapter 1 Transition Elements; Chapter 2 Chemical Analysis; Chapter 3 Chemical Equilibrium; Term 1 review
1
The d block and the first series in use Chapter 1 Transition Elements (A): chapter opener and objectives, the d block and the four transition series, the first series Sc to Zn and the uses of each element (light, descriptive week)
Configurations, oxidation states and who counts as a transition element Chapter 1 (B): electron configurations of the first series with the chromium and copper exceptions, oxidation states (why iron(II) oxidises easily and manganese(II) does not), the definition of a transition element, coinage metals in and zinc, cadmium and mercury out
Properties, magnetism and catalysts of the first series Chapter 1 (C): general properties of the first series (atomic mass, radius, density, metallic character), paramagnetic and diamagnetic substances and counting unpaired electrons, transition metals as catalysts
Iron ores, extraction, steel and alloys Chapter 1 (D): iron in nature, the iron ores, ore dressing and roasting, reduction in the blast furnace and the gas-reduction furnace, cast iron and steel, the three types of alloys (conceptual: industrial processes are described, never instructed)
Iron and its oxides Chapter 1 (E): pure iron and its +2 and +3 states, the reactions of iron (air, steam, chlorine, sulphur, acids, passivity) and the three oxides of iron with their preparation and properties (paper equations and calculations only)
Chemical analysis and the dilute hydrochloric acid group Chapter 2 Chemical Analysis (A): chapter opener and a revision of earlier mole formulas (Darslab practice), what chemical analysis is for, qualitative and quantitative analysis, the three anion groups and the dilute hydrochloric acid group (carbonate, hydrogencarbonate, sulphite, sulphide)
The rest of the anions and a decision chart Chapter 2 (B): the rest of the anions: thiosulphate and nitrite, the concentrated sulphuric acid group (chloride, bromide, iodide, nitrate with the brown-ring test) and the barium chloride group (phosphate, sulphate); a sorting task on all twelve anions (Darslab practice)
Cations, and the idea of a titration Chapter 2 (C): detecting cations (six analytical groups: copper(II), aluminium, iron(II), iron(III), calcium) and the start of quantitative analysis: titration, standard solutions, end point and indicators
Calculations in analysis: titration and mass analysis Chapter 2 (D): titration calculations with MaVa/na = MbVb/nb, the percentage of a substance in a mixture from a titration, and mass (gravimetric) analysis by volatilisation and by precipitation (water of crystallisation, mass of an ion from a precipitate)
Equilibrium in a closed vessel and the rate of reaction Chapter 3 Chemical Equilibrium (A): chapter opener, physical equilibrium (evaporation and condensation), complete and reversible reactions, chemical equilibrium as a dynamic state, the rate of reaction and what it depends on, the nature of the reactants
Collisions, the law of mass action and Kc Chapter 3 (B): surface area and concentration, the law of mass action, the equilibrium constant Kc and what its size means (short, calculation-light text: two and a half book pages, add worked examples and prediction tasks)
Strong and weak electrolytes, Ka and Ostwald’s law Chapter 3 (D): ionic equilibrium: strong and weak electrolytes, ionisation of acids, ionisation constants, the hydronium ion, the degree of ionisation and Ostwald’s dilution law
Weak acids and bases, Kw, pH and the solubility product Chapter 3 (E): hydronium and hydroxide concentrations of weak acids and bases, the ionisation of water and Kw, pH and pOH, solubility and the solubility product Ksp (heaviest week: three lessons of calculations)
The Egyptian Ministry of Education and Technical Education (MOETE) is not affiliated with, and does not endorse, Darslab. Lessons follow the order of the Ministry’s textbooks; all explanations, exercises and quizzes are Darslab’s own. Pictures of animals, plants and objects: Twemoji, CC BY 4.0.
