Edexcel International GCSE Chemistry (4CH1) covers the fundamental principles of chemistry through five key areas: principles, inorganic, physical, organic, and practical chemistry.
Principles: states of matter, atomic structure, periodic table, chemical bonds (ionic, covalent, metallic), formulae, equations, calculations (moles, reacting masses, concentrations). Inorganic: Group 1, Group 7, gases in the atmosphere, metals and reactivity series, extraction, tests for ions and gases. Physical: energetics, rates of reaction, equilibria, acids and bases, electrolysis. Organic: crude oil, hydrocarbons, alkanes, alkenes, alcohols, carboxylic acids, esters, addition/condensation polymerisation.
Core practicals include: preparing a soluble salt, titrations, investigating rates of reaction (temperature, concentration, catalyst), electrolysis of aqueous solutions, identifying unknown substances through chemical tests. Exam questions require describing procedures, identifying apparatus, and analysing results.
Paper 1: 2 hours, 120 marks (61.1%). Paper 2: 1 hour 15 min, 60 marks (38.9%). Both papers: MCQ, short-answer, calculations, extended writing. Calculator allowed. Questions frequently involve interpreting data from tables and graphs.
A significant portion of IGCSE Chemistry involves calculations: relative formula mass, moles, reacting masses, percentage composition, empirical formulae, concentration (mol/dm³), gas volumes, and energy calculations. Typically 20–25% of marks require mathematical skills. Ensure you can confidently rearrange formulae and convert units.
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