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Polymers IGCSE

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Quiz 1: Fullscreen Mode Quiz 2: Fullscreen Mode 🧪 POLYMERS - Complete Notes Cambridge IGCSE Chemistry | Chapter 19 1️⃣ What are Polymers? POLYMER = A very large molecule made from many small repeating units called monomers MONOMER = A small molecule that joins to other monomers to form a polymer POLYMERISATION = The process of joining monomers to form a polymer M + M + M Polymerisation M M M ... Monomers Polymer 📊 Types of Polymers Natural Polymers Synthetic Polymers ✓ Proteins (meat, eggs) ✓ Poly(ethene) (plastic bags) ✓ Starch (rice, bread) ✓ Poly(propene) (ropes) ✓ Natural rubber ✓ PVC (pipes) ✓ Silk ✓ Nylon (clothing) ✓ Cellulose ✓ PET (bottles) 2️⃣ Addition Polymerisation Addition polymerisation occurs...
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IMSEO: Indonesia Mathematic Olympiad

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Quiz 1:   Fullscreen Mode IMSEO: Indonesia Mathematic Science English Olympiad Kabar gembira bagi para siswa Sekolah Dasar di seluruh Indonesia! Indonesia Mathematic Science English Olympiad (IMSEO) kembali digelar tahun 2025 ini. Olimpiade bergengsi ini dirancang untuk menguji dan mengembangkan kemampuan matematika siswa SD dari berbagai tingkatan. IMSEO menjadi ajang kompetisi yang sangat dinanti sebagai wadah bagi siswa untuk mengukur kemampuan dan mengasah keterampilan matematika mereka di tingkat nasional. Tentang IMSEO 2025 IMSEO 2025 merupakan olimpiade matematika yang diselenggarakan untuk siswa SD dari kelas 4 hingga kelas 6. Kompetisi ini bertujuan untuk meningkatkan minat dan kemampuan siswa dalam bidang matematika, serta mempersiapkan mereka untuk kompetisi tingkat internasional. Olimpiade ini mengadopsi pendekatan spiral dalam penyusunan materi, di mana konsep dan keterampilan yang lebih tinggi dibangun di atas dasar-...
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Straight lines and quadratic equations

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Other note source 📐 STRAIGHT LINES & QUADRATIC EQUATIONS Cambridge IGCSE Mathematics - Quick Reference Guide PART 1: STRAIGHT LINES 📊 Standard Form y = mx + c m = gradient (slope/steepness) c = y-intercept (crosses y-axis) x, y = coordinates Example: y = 3x + 2 • Gradient = 3 (rises 3 for every 1 across) • Y-intercept = 2 (crosses at (0,2)) Gradient Formula m = (y₂ - y₁) / (x₂ - x₁) Type Value Direction Positive m > 0 ↗ Up right Negative m ↘ Down right Zero m = 0 → Horizontal Undefined - ↑ Vertical Example: Points (2, 4) and (6, 12) m = (12 - 4)/(6 - 2) = 8/4 = 2 Special Lines Horizontal: y = k (e.g. y = 3) Vertical: x = k (e.g. x = -2) Parallel Lines Same gradient: m₁ = m₂ Lines y = 2x + 1 and y = 2x - 5 are parallel (both m = 2) Perpendicular Lines m₁ × m₂ = -1 or m₂ = -1/m₁ Line 1 Line 2 (⊥) m = 2 m = -½ m = 3 m = -⅓ m = -4 m = ¼ Intercepts Y-intercept: Set x = 0, solv...
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