Your journey to excellence inCombined Science
By Revision Genie
Cells as the basic unit of life
Questions are written as you practise.
Plant cells vs animal cells: key similarities and differences
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Prokaryotic cells vs eukaryotic cells
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Cell organelles and their functions
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Using a light microscope safely and correctly
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Preparing slides and using stains to improve contrast
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Calculating magnification and image size
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Comparing light and electron micrographs (what each can show)
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The role of DNA in cells (genetic material as a code)
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Proteins as biological molecules with specific functions
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Enzymes as biological catalysts
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Lock-and-key model and enzyme specificity
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Factors affecting enzyme activity: temperature, pH, substrate concentration
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What respiration is and why cells need it
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Aerobic respiration: word equation and key ideas
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Anaerobic respiration in muscles
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Anaerobic respiration in microorganisms (fermentation basics)
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Comparing aerobic vs anaerobic respiration (energy release)
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Respiration as an enzyme-controlled process
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Using respiration ideas to explain exercise and recovery
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Interpreting simple data about respiration rate
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Photosynthesis as a chemical reaction in plants
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The word equation and what it means
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Chloroplasts and chlorophyll: where photosynthesis happens
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How light intensity affects photosynthesis
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How carbon dioxide concentration affects photosynthesis
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How temperature affects photosynthesis
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Limiting factors and predicting the rate-limiting factor
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Using glucose made in photosynthesis (storage and transport)
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Linking photosynthesis and respiration in ecosystems
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Diffusion: what it is and what affects the rate
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Osmosis: movement of water and partially permeable membranes
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Active transport: moving substances against a concentration gradient
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Comparing diffusion, osmosis and active transport
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From cells to tissues to organs to organ systems
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Mitosis as cell division for growth and repair
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Stem cells: what they are and why they matter
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Exchange surfaces: what makes them efficient
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Plant transport tissues: xylem and phloem (what they carry)
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Transpiration basics and why plants lose water
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Surface area to volume ratio and why it matters
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Diffusion distance and exchange efficiency
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Why multicellular organisms need transport systems
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The human circulatory system: overview and purpose
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Double circulatory system in mammals
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The heart: chambers, valves and blood vessels
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Arteries, veins and capillaries: structure and function
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Blood components: plasma, red cells, white cells and platelets
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Gas exchange in the lungs: structure and function of alveoli
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Interpreting circulatory/gas exchange data in exam-style questions
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The nervous system: CNS, sensory receptors and effectors
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Stimulus–response pathways and survival value
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Reflex actions and reflex arcs
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Synapses (simple model) and neurotransmitters
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The endocrine system and hormone signalling
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Comparing nervous vs hormonal control
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Homeostasis: maintaining stable internal conditions
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Thermoregulation: sweating, shivering and blood flow changes
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Blood glucose control: insulin and glucagon
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Diabetes (type 1 and type 2 at GCSE level)
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Kidneys and osmoregulation (water balance)
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Negative feedback as a control mechanism
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What an ecosystem is (biotic and abiotic factors)
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Levels of organisation: organism to community to ecosystem
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Food chains and trophic levels
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Food webs and interdependence
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Competition and predator–prey relationships
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Pyramids of number, biomass and energy
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Decomposers and nutrient recycling
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The carbon cycle
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The water cycle
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Biodiversity: what it means and why it matters
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Human impacts on ecosystems (habitat loss, pollution)
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DNA, genes and chromosomes: the big picture
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Genetic terms: genotype, phenotype and alleles
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Dominant and recessive inheritance
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Monohybrid crosses using Punnett squares
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Inherited disorders (using clear examples)
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Sex determination (XX/XY) and inheritance patterns
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Variation: genetic vs environmental
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Mutation as a source of new variation
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Natural selection: how it works, step by step
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Evolution and adaptation (linking to survival and reproduction)
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Selective breeding: process, benefits and drawbacks
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Antibiotic resistance as an example of evolution in action
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Monitoring ecosystems and environmental change
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Pollution and biodiversity: causes and consequences
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Food security: why feeding humans is challenging
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Increasing food production: farming methods and trade-offs
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Fertilisers and eutrophication (cause → effect chains)
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Genetic modification in crops: potential benefits and concerns
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Health and disease: what the terms mean
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Communicable vs non-communicable diseases
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Pathogens (virus, bacteria, protist, fungi) and how disease spreads
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Plant diseases and human infections (named examples)
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Reducing spread: hygiene, isolation, plant control measures
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White blood cells and platelets: how they protect the body
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Non-specific defences (skin, mucus, stomach acid)
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Vaccination: how vaccines work and why they’re used
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Antibiotics, antivirals and antiseptics (what each is for)
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Developing new medicines: preclinical and clinical testing
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Lifestyle factors and disease risk (smoking, diet, exercise, alcohol)
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Solids, liquids and gases in the particle model
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Explaining density using particles
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Explaining diffusion using particles
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Gas pressure in terms of particle collisions
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Changes of state and heating/cooling curves
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Internal energy and temperature (what changes and why)
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Atomic structure: protons, neutrons and electrons
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Isotopes and relative atomic mass
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Electronic structure (simple shell model)
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The Periodic Table: periods and groups
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Metals vs non-metals: typical physical properties
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Using atomic structure to explain simple reactivity patterns
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Elements, compounds and mixtures: clear definitions
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Pure substances and impurities
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Filtration, crystallisation and simple distillation
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Fractional distillation (separating liquids)
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Paper/TLC chromatography: how separation works
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Reading chromatograms and calculating Rf values
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Choosing the best separation technique for a substance
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Ionic bonding: electron transfer and ion formation
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Covalent bonding: sharing electrons and molecules
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Metallic bonding: why metals conduct and are malleable
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Giant ionic structures vs simple molecular substances
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Polymers: repeating units and basic properties
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Materials: ceramics, polymers, composites and alloys (uses)
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Writing word equations and balancing symbol equations
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Conservation of mass (reactants vs products)
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Exothermic and endothermic reactions
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Reaction profiles (energy changes)
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Acids and alkalis: pH and neutralisation
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Making salts (including crystallisation of a soluble salt)
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Reactivity series of metals (patterns and uses)
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Displacement reactions (metal and halogen examples)
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Oxidation and reduction (electron/oxygen ideas at GCSE level)
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Electrolysis: what it is and why ions matter
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Electrolysis of molten ionic compounds (products at electrodes)
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Electrolysis of aqueous solutions (how products are chosen)
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Using the Periodic Table to predict chemical behaviour
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Group 1 metals: reaction patterns (water and oxygen)
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Group 7 halogens: reaction patterns and displacement
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Noble gases: why they’re unreactive
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Naming key compounds from formulas (basic GCSE set)
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Identifying ions with flame tests and simple precipitation tests
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Identifying gases (hydrogen, oxygen, carbon dioxide, chlorine)
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Using tests to identify unknown substances in exam questions
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Using observations to infer reaction type
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Collision theory: why reactions happen at different speeds
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Measuring rate: gas volume, mass change, precipitation
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Factors affecting rate: temperature, concentration, surface area
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Catalysts and enzymes (comparing role as catalysts)
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Interpreting rate graphs (tangent/gradient ideas)
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Reversible reactions and dynamic equilibrium
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Le Chatelier’s principle (temperature, pressure, concentration)
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Equilibrium in industrial processes (Haber process context)
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Yield, atom economy and sustainability links
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Finite resources and sustainable chemistry choices
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Life-cycle assessments: what they include and why they matter
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Recycling: benefits, limitations and real-world trade-offs
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Crude oil as a resource and why it’s useful
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Fractional distillation of crude oil: fractions and uses
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Cracking hydrocarbons: conditions and products
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Alkanes and the homologous series (patterns in formulas)
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Polymer production and environmental impacts
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Earth’s atmosphere: changes over time (GCSE narrative)
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Greenhouse effect vs climate change (separating ideas clearly)
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Human activity and atmospheric composition (evidence-based links)
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Potable water production and wastewater treatment (core stages)
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Particle model in physics (motion and spacing)
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Density: measuring, calculating, and interpreting results
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Pressure in fluids (qualitative + simple calculations)
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Moments and turning effect in everyday contexts (if assessed in suite questions)
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Changes of state: melting, boiling, evaporation, condensation
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Latent heat and why temperature stays constant during change of state
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Heating curves: reading and sketching from data
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Gas pressure and temperature/volume trends (basic model)
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Distance, time and speed: core definitions
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Using distance–time graphs
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Velocity and acceleration (what they mean)
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Using velocity–time graphs (including distance from area)
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Calculating acceleration from data/graphs
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Newton’s first law: inertia and balanced forces
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Newton’s second law: force, mass and acceleration
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Newton’s third law: action–reaction pairs
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Weight, mass and gravitational field strength
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Friction, drag and terminal velocity
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Stopping distance: thinking and braking distance factors
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Hooke’s law and spring extension
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Work done by a force and energy transfer in motion
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Static charge: build-up, attraction and discharge
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Current as rate of flow of charge
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Potential difference and what it represents
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Series circuits: current, potential difference and resistance rules
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Parallel circuits: current splitting and shared potential difference
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Resistance and the I = V/R relationship
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Measuring current and potential difference correctly
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I–V characteristics for ohmic conductors and non-ohmic components
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Power in electrical devices (power, energy and time links)
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Mains electricity safety: live, neutral, earth, fuses
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Magnets and magnetic fields (field lines and poles)
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Electromagnets: making and strengthening them
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Using electromagnets in real devices (relays, motors context)
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Transverse vs longitudinal waves
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Describing waves: amplitude, wavelength, frequency, period
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The wave equation and basic calculations
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Reflection and refraction (ray ideas and wave speed changes)
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Sound waves: pitch, volume and oscilloscopes (core interpretation)
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Electromagnetic spectrum: order and key uses
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Hazards and safety with different EM waves
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Radioactivity: what it is and why nuclei are unstable
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Alpha, beta and gamma: properties and penetration
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Irradiation vs contamination
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Half-life (interpreting graphs and simple calculations)
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Background radiation and risk
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Energy stores and pathways (transfers)
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Conservation of energy and Sankey diagrams
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Work done as energy transferred
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Kinetic and gravitational potential energy calculations
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Elastic potential energy in springs (GCSE calculation focus)
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Power: what it means and how to calculate it
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Efficiency and why no process is 100% efficient
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Ways to improve efficiency in everyday systems
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Energy resources: comparing reliability and environmental impact
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Physics on the move: forces and energy in transport
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Reducing unwanted energy transfers in vehicles
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Braking and safety features explained with forces/energy ideas
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Powering Earth: how electricity is generated
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Non-renewable vs renewable resources: pros and cons
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National and local issues: demand, reliability and cost
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Transformers (core idea: stepping voltage up/down)
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Transmission efficiency and why high voltage is used
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Storing energy from renewables (batteries, pumped storage context)
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Lab safety: hazards, risks and control measures
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Writing a clear method that can be repeated
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Identifying independent, dependent and control variables
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Accuracy, precision, repeatability and reproducibility
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Estimating uncertainty and spotting anomalous results
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Recording data in suitable tables (headings, units, resolution)
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Drawing graphs correctly (scales, labels, best-fit lines)
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Interpreting gradients and areas where relevant
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Sampling techniques and using means appropriately
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Required apparatus and techniques
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Planning and evaluating practical investigations (improvements and limitations)
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Linking practical methods to exam questions (methods, variables, calculations, conclusions)
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