Grade 11 — Term 1
Aligned with NIE syllabus
This term in the Idasara Academy app has 4 lessons (NIE Units 3, 5, 6, 8). For each lesson, this page gives you the points you must know and one exam-style question with its answer. None of it needs an account.
Is this what my class is doing now?
Maybe not. The Idasara app groups lessons into its own terms, and your school may teach them in a different order. Where we know a lesson's NIE unit, it is shown on the lesson. Find the unit your class is on, and start there.
Lessons in This Term
Chemical Compounds and Equations
NIE Unit 3
What you must know
- Exothermic: releases heat (combustion, neutralisation); ΔH < 0
- Endothermic: absorbs heat (thermal decomposition); ΔH > 0
- Activation energy: minimum energy needed to start reaction
- Collision theory: reaction occurs when particles collide with sufficient energy
Acids, Bases, pH and Salts
NIE Unit 5
What you must know
- HCl + NaOH → NaCl + H₂O (key equation)
- Indicators: litmus (red=acid, blue=alkali), universal indicator, phenolphthalein
- Stomach acid: pH ~2 (HCl); baking soda: pH ~8–9
- Strong acids: HCl, H₂SO₄, HNO₃; weak acids: citric, acetic
Hydrocarbons and Organic Compounds
NIE Unit 6
What you must know
- Functional groups: -OH (alcohols), -COOH (carboxylic acids), -COO- (esters)
- Ethanol (C₂H₅OH): fermentation: C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂
- Polymers: many monomers joined; polyethylene from ethene; addition polymerisation
- Homologous series: same functional group, differ by CH₂; trends in properties
Current, Voltage, Resistance and Ohm's Law
NIE Unit 8
What you must know
- Power: P = IV = I²R = V²/R; unit = Watt (W)
- Series: same I throughout; V_total = V₁ + V₂; R_total = R₁ + R₂
- Parallel: same V across branches; I_total = I₁ + I₂; 1/R_total = 1/R₁ + 1/R₂
- Household wiring = parallel (each appliance gets full voltage)
- Fuse/circuit breaker: protects circuit from excess current
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