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
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الفئة d والسلسلة الأولى واستخداماتها 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)
التراكيب الإلكترونية وحالات التأكسد ومن يُعدّ عنصرًا انتقاليًّا 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
خواص السلسلة الأولى ومغناطيسيتها وعواملها الحفازة 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
خامات الحديد واستخلاصه والصلب والسبائك 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)
الحديد وأكاسيده 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)
التحليل الكيميائي ومجموعة حمض الهيدروكلوريك المخفف 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)
بقية الأنيونات وخريطة قرار 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)
الكاتيونات وفكرة المعايرة 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
حسابات التحليل: المعايرة والتحليل الكتلي 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)
الاتزان في وعاء مغلق ومعدل التفاعل 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
التصادمات وقانون فعل الكتلة وثابت الاتزان 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)
درجة الحرارة والضغط وKp وقاعدة لوشاتيليه Chapter 3 (C): temperature and collision theory (activation energy), pressure and Kp, Le Chatelier’s principle, catalysts and light
الإلكتروليتات القوية والضعيفة وKa وقانون أوستفالد 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
الأحماض والقواعد الضعيفة وKw وpH وحاصل الإذابة 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.
