GCSE / IGCSE Chemistry including Exams

Establish the scientific foundations you will need to succeed across the entire GCSE Chemistry programme. This unit covers the nature of scientific enquiry, experimental design and fair testing, the use of variables and controls, recording and interpreting data, and evaluating conclusions. You also receive guidance on how to study effectively online, manage your time, and approach the specific assessment style of Pearson Edexcel GCSE and IGCSE papers. The unit introduces the key ideas about atoms, elements, compounds, and mixtures that underpin all subsequent chemistry study.

Explore the internal structure of atoms in detail: the roles and relative masses of protons, neutrons, and electrons; how atomic number and mass number define an element; and what isotopes are and why they matter. You trace the history of atomic theory from Dalton and Thomson to Rutherford and Bohr, and examine the development of the modern periodic table. The unit develops your ability to use the periodic table to predict the electronic configuration and chemical properties of elements in Groups 1, 7, and 0, and to understand the trends in atomic radius, ionisation energy, and reactivity that characterise each group.

Examine the three principal types of chemical bonding and the structures they produce. You develop a thorough understanding of ionic bonding — including how to represent ionic compounds using dot-and-cross diagrams and lattice structures — and connect the properties of ionic compounds (high melting points, electrical conductivity when dissolved or molten) to their structure. Covalent bonding is explored at the level of simple molecular substances and giant covalent structures such as diamond, graphite, and silicon dioxide, with explanations of their contrasting properties. The unit also covers metallic bonding and the properties of metals, including electrical conductivity and malleability.

Develop the mathematical skills essential for success in GCSE Chemistry examinations. The unit covers the mole concept and Avogadro's number, the calculation of relative formula masses, and the use of balanced chemical equations to calculate reacting masses and product yields. You learn how to express concentrations in mol/dm³ and g/dm³, calculate the volumes of gases at standard conditions using the molar volume, and determine percentage yield and atom economy in chemical reactions. These quantitative skills are applied to industrial chemistry contexts, helping you connect classroom mathematics to real-world manufacturing processes.

Study the chemistry of reactions that produce chemical changes in substances. You examine the reactivity series of metals and use it to predict displacement reactions; study the reactions of metals and metal oxides with acids; investigate the production of salts through neutralisation, precipitation, and crystallisation; and explore electrolysis in detail, including the electrolysis of brine, acidified water, and molten compounds. The unit also covers the industrial applications of electrolysis in metal extraction and purification, and the chemistry of the blast furnace in iron and steel production.

Investigate the role of energy in chemical reactions, distinguishing between exothermic reactions (which release energy to the surroundings) and endothermic reactions (which absorb energy). You learn to interpret and draw energy profile diagrams, calculate the energy change in a reaction using bond energies, and apply these principles to everyday contexts including combustion, neutralisation, and the respiration reactions in living organisms. The unit also introduces fuel cells and batteries as examples of electrochemical energy storage and conversion, connecting energy chemistry to contemporary debates about sustainable energy technologies.

Build on your understanding of energy changes to explore how and why different reactions proceed at different speeds. You examine the factors that affect reaction rate — temperature, concentration, surface area, and the use of catalysts — and connect these to collision theory: the idea that reactions occur when particles collide with sufficient energy and the correct orientation. The unit introduces reversible reactions and the concept of dynamic equilibrium, including Le Chatelier's Principle and its application to industrial processes such as the Haber Process for ammonia production and the Contact Process for sulfuric acid manufacture.

Study the chemistry of carbon-based compounds, beginning with the hydrocarbons found in crude oil and natural gas. You examine the properties and uses of alkanes, the process of fractional distillation of crude oil, and the cracking of long-chain hydrocarbons into shorter, more useful molecules including alkenes. The unit covers the chemistry of alkenes in detail — their double bonds, addition reactions, and role as monomers in addition polymerisation. You also study the properties and uses of alcohols and carboxylic acids, and are introduced to condensation polymerisation and the chemistry of synthetic and natural polymers including nylon and proteins.

Develop the skills to identify unknown substances using a range of qualitative and quantitative analytical techniques. You examine the use of flame tests, precipitation reactions, and test tube reactions to identify cations, anions, and gases in an unknown sample. The unit introduces instrumental analytical techniques including chromatography (paper and thin-layer), mass spectrometry, and infrared spectroscopy, and examines how these methods are used in the pharmaceutical, environmental monitoring, and forensic science sectors. You learn to interpret chromatograms and interpret simple mass and infrared spectra to determine the identity of unknown compounds.

Trace the evolution of the Earth's atmosphere from its primordial composition dominated by volcanic gases to its current composition of approximately 78% nitrogen, 21% oxygen, and trace amounts of other gases including carbon dioxide and water vapour. You examine the evidence for how the atmosphere changed over geological time — including the role of photosynthesis in creating the oxygen-rich atmosphere we breathe today — and analyse the chemistry of contemporary air pollution, including the formation of acid rain, ground-level ozone, and particulates from combustion. The unit connects atmospheric chemistry to the greenhouse effect, global warming, and climate change.

Examine the resources that humans extract from the Earth and the scientific principles and environmental considerations that govern their sustainable use. You study the water cycle and the treatment of fresh water for drinking, the processes used to extract, purify, and recycle metals from their ores, and the role of the chemical industry in producing materials from finite raw materials. The unit considers the principles of sustainable development, life cycle assessment of materials, and the role of the green chemistry movement in designing safer and more resource-efficient industrial processes. Mock examination practice across the full specification is integrated throughout.