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Search every subject world, from Preschool to Grade 12. The first five courses of every subject path are free.

32 courses

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Science · Grade 6

Identify a Need and Constraints

Engineering starts with people, not gadgets. Learners observe and listen to users and stakeholders to find a genuine need, plan respectful user research with neutral questions, write solution-neutral problem statements with a sensible scope, and turn a client's wish list into a specification: firm constraints plus measurable criteria with target values, units and test methods. An optional Going further lesson adds factors of safety, shared budgets and breaking a large problem into sub-problems.

  • 5 lessons
  • About 110 min
  • Quiz: 10 questions
Free starter

Science · Grade 6

Research, Sketch and Model

Learners take a defined problem (a tablet stand for a school's video-call corner) from research to a modelled concept. They analyse existing solutions function by function and record sources honestly, generate many ideas before judging, select concepts by screening against constraints and comparing with a reference design, communicate with annotated sketches and orthographic views, convert between drawing and real lengths with scales, and choose physical, digital or mathematical models while stating their limits. An optional Going further lesson explores how areas and masses change when models are scaled, and counts concepts in a morphological chart.

  • 5 lessons
  • About 115 min
  • Quiz: 11 questions
Free starter

Science · Grade 6

Materials, Structures and Mechanisms

Learners equip a school's outdoor classroom. They choose materials by matching whole property profiles (strength, stiffness, density, toughness, durability, conductivity, cost) to requirements, using density data from a float simulation; explain tension, compression, triangulation, trusses and deep beams; and use levers, pulleys, wheels and axles and gears, calculating ideal mechanical advantage and the force-for-distance tradeoff. An optional Going further lesson calculates work, efficiency and compound gear ratios.

  • 5 lessons
  • About 120 min
  • Quiz: 11 questions
Free starter

Science · Grade 6

Energy, Controls and Simple Systems

Learners treat devices as systems. They trace energy chains through devices and separate useful outputs from energy that spreads to the surroundings; describe a school greenhouse's cooling system as inputs, processes and outputs with sensors, a controller, actuators and a power source; compare open-loop and closed-loop control and write and trace flowcharts; and use a circuit simulation to choose series or parallel arrangements for a lantern. An optional Going further lesson calculates power, energy budgets, battery run time and efficiency, and adds a switching band (hysteresis) to on/off control.

  • 5 lessons
  • About 115 min
  • Quiz: 10 questions
Free starter

Science · Grade 6

Prototype in Safe Virtual Environments

Learners choose prototypes of the right fidelity for each design question, then use two simulations as virtual prototypes: a ramp model to map a design space and find every setting that lands a toy car in a target zone, and a heat-transfer model to screen handle materials for a camping mug. They list what each simulation leaves out, separate questions a model can answer from those that need a physical test, and plan safe physical prototyping with a hazard–risk–control assessment. An optional Going further lesson calibrates a model against real measurements and contrasts interpolation with extrapolation.

  • 5 lessons
  • About 120 min
  • Quiz: 11 questions
Free starter

Science · Grade 6

Test, Measure and Iterate

A maker club's recycled-card shelf brackets keep failing, and learners use them to practise the testing half of engineering. They write test plans tied to specific requirements with pass thresholds and repeated trials, choose instruments with suitable resolution, summarise repeated measurements, handle odd results honestly, and use a sampling simulation to see why quality checks need large enough samples. They analyse failures with the 'five whys' to separate symptoms from root causes, then make data-driven iterations, one change at a time, and decide when to stop. An optional Going further lesson quantifies measurement uncertainty and compares designs whose results overlap.

  • 5 lessons
  • About 115 min
  • Quiz: 11 questions

Science · Grade 6

Accessibility, Sustainability and Tradeoffs

Good designs work for the full range of people who will use them and do as little harm as possible across their whole life. Learners apply universal-design principles and check accessibility with real users, trace a product's environmental impact through its life cycle, and weigh competing criteria with a weighted decision matrix and a sensitivity check. A Going further lesson compares options quantitatively with functional units, break-even points and payback times.

  • 4 lessons
  • About 115 min
  • Quiz: 10 questions

Science · Grade 6

Document and Demonstrate a Design

The final course turns a design project into evidence other people can trust and build on. Learners keep an honest engineering notebook, structure a design report that traces every requirement to a test and a result, present data clearly and truthfully, credit sources and teammates, and plan an accessible demonstration that invites critique. A Going further lesson adds a bill of materials, safety margins and a verification summary.

  • 5 lessons
  • About 115 min
  • Quiz: 10 questions

Science · Grade 9

Biological Questions, Safety and Evidence

Learners turn observations of living things into testable questions, hypotheses and predictions, and learn what observational and experimental evidence can each show. They plan safe and ethical biology work, design controlled experiments that allow for biological variability, analyse data with means, ranges and percentage change, and use microscope calculations to measure cells.

  • 5 lessons
  • About 115 min
  • Quiz: 11 questions
Free starter

Science · Grade 9

Chemistry of Life and Biological Molecules

Learners explain how the polarity of water and hydrogen bonding give water the properties living things depend on, classify carbohydrates, lipids, proteins and nucleic acids by their building blocks and functions, and write balanced equations for the condensation and hydrolysis reactions that build and break them. They finish by modelling enzymes as shaped protein catalysts and interpreting temperature, pH and rate data, including denaturation.

  • 5 lessons
  • About 120 min
  • Quiz: 11 questions
Free starter

Science · Grade 9

Cells, Membranes and Transport

Learners compare prokaryotic and eukaryotic cells and follow a protein through the organelles that make and export it. They model the cell membrane as a phospholipid bilayer studded with proteins, explain and predict diffusion and osmosis in animal and plant cells using real-style data, distinguish passive, active and bulk transport by energy use and direction, and calculate surface-area-to-volume ratios to explain why cells stay small.

  • 5 lessons
  • About 125 min
  • Quiz: 12 questions
Free starter

Science · Grade 9

Energy in Living Systems

Learners explain ATP as the energy currency that links energy-releasing and energy-using processes, then model photosynthesis and cellular respiration with balanced equations, organelle locations and stages. They analyse limiting factors and the balance between photosynthesis and respiration with a growth model and gas-exchange data, and finish by tracking atoms and energy through plants, animals and decomposers, including where a tree's mass comes from.

  • 5 lessons
  • About 125 min
  • Quiz: 11 questions
Free starter

Science · Grade 9

Cell Division and Growth

Learners model the cell cycle and mitosis, track chromosome and DNA numbers through each stage, and estimate how long each phase lasts from root-tip counts. They explain how checkpoints and control genes keep division in check and how cancer arises when that control is lost, then explore how differentiation and stem cells turn one fertilised egg into many specialised cell types, including the scientific and ethical questions stem cell research raises.

  • 5 lessons
  • About 120 min
  • Quiz: 11 questions
Free starter

Science · Grade 9

Heredity and Genetic Models

Learners explain how meiosis makes haploid gametes and shuffles alleles, then use Mendel's model, Punnett squares and the rules of probability to predict monohybrid and dihybrid crosses as fractions and expected counts. They extend the model to incomplete dominance, codominance, multiple alleles and sex-linked traits, and finish by reading pedigrees to infer how a trait is inherited and to calculate family probabilities.

  • 5 lessons
  • About 125 min
  • Quiz: 12 questions

Science · Grade 9

DNA, Gene Expression and Biotechnology

Learners model DNA's structure and its semi-conservative replication, then follow a gene to a protein by transcribing DNA and translating mRNA with a codon table. They classify mutations and predict their effects, explain how genes are switched on and off, and finish with the science and ethics of PCR, gel electrophoresis and gene editing.

  • 5 lessons
  • About 125 min
  • Quiz: 12 questions

Science · Grade 9

Evolution and Evidence

Learners explain natural selection as a mechanism acting on heritable variation, weigh fossil, anatomical, embryological, molecular and biogeographic evidence for common ancestry, and measure evolution as changing allele frequencies, including the role of chance in small populations. They finish by explaining how reproductive isolation produces new species and by reading cladograms built from shared derived characters.

  • 5 lessons
  • About 125 min
  • Quiz: 12 questions

Science · Grade 9

Ecological Relationships and Populations

Learners model population growth with exponential and logistic equations, explain carrying capacity with density-dependent and density-independent limiting factors, and analyse predator–prey cycles with a simulation whose rule they take apart. They classify species interactions by their effects on each partner and estimate real population sizes with quadrats and mark–recapture, stating the assumptions behind every estimate.

  • 5 lessons
  • About 125 min
  • Quiz: 12 questions

Science · Grade 9

Matter and Energy in Ecosystems

Learners place organisms at trophic levels in food webs, calculate gross and net primary production and the efficiency of energy transfer between levels, and explain pyramids of numbers, biomass and energy, including inverted ones. They then model the carbon cycle at ecosystem and global scale, including anaerobic decomposition and fossil carbon, and the nitrogen cycle with its microbes, writing balanced equations for key steps.

  • 5 lessons
  • About 125 min
  • Quiz: 12 questions

Science · Grade 9

Human Impacts and Biological Solutions

Learners analyse how habitat loss and fragmentation, invasive species, overharvesting, pollution and climate change affect populations, using species–area, sustainable-yield, biomagnification and timing data. They explain why biodiversity and genetic diversity matter for ecosystem services and resilience, and finish by evaluating conservation and restoration solutions with criteria, constraints, weighted decision matrices and monitoring data.

  • 5 lessons
  • About 125 min
  • Quiz: 12 questions

Science · Grade 9

A Biology Investigation with Reviewed Lab Evidence

In this capstone, learners carry out a complete biology investigation into how light affects seedling growth. They plan it with variables, controls, replication and a risk assessment, run a virtual lab and process its data into a graph with a meaningful gradient, analyse a realistic class data set with means, uncertainties and anomalies, evaluate errors, validity and the limits of virtual labs, and write report sections that a teacher reviews.

  • 5 lessons
  • About 130 min
  • Quiz: 12 questions

Science · Grade 10

Chemical Measurement, Safety and Models

The opening chemistry unit builds the habits every later course depends on: reading hazard information and planning safe work, using SI units and scientific notation, recording measurements with honest precision and significant figures, calculating density with dimensional analysis, and judging what a chemical model shows and leaves out.

  • 5 lessons
  • About 110 min
  • Quiz: 10 questions
Free starter

Science · Grade 10

Atomic Structure and Evidence

Learners use atomic number and mass number to count the particles in atoms, ions and isotopes, follow the experimental evidence that forced the atomic model to change from Dalton to Bohr, calculate average atomic mass from isotope data, and connect electron energy levels to the line spectra that identify elements, even in distant stars.

  • 4 lessons
  • About 105 min
  • Quiz: 10 questions
Free starter

Science · Grade 10

Periodic Patterns and Explanations

Learners read the periodic table as a model: position tells the number of shells and valence electrons. They explain trends in atomic radius, ionization energy and electronegativity with one idea (the attraction between the nucleus and outer electrons), test those explanations against real data, and use them to predict the behaviour of elements they have never studied.

  • 4 lessons
  • About 105 min
  • Quiz: 10 questions
Free starter

Science · Grade 10

Bonding and Molecular Structure

Learners explain why atoms bond: by transferring electrons to form ions, or by sharing pairs of electrons. They write formulas for ionic compounds, build Lewis structures, predict molecular shapes and polarity, and then use bonding and intermolecular forces to explain melting points, boiling points and electrical conductivity, including the unusual behaviour of water.

  • 4 lessons
  • About 115 min
  • Quiz: 10 questions
Free starter

Science · Grade 10

Chemical Reactions and Representations

Learners read chemical formulas as atom inventories, connect particle models of reactions to symbolic equations, and balance equations by changing coefficients only, never the identities of substances. They then explain conservation of mass as atoms rearranging, test that idea against open and closed systems, and finish with unseen reactions and a clear statement of what a balanced equation can and cannot tell us.

  • 5 lessons
  • About 110 min
  • Quiz: 10 questions
Free starter

Science · Grade 10

Moles and Quantitative Relationships

Learners meet the mole, the chemist's counting unit that links the invisible world of particles to masses we can weigh. They calculate molar masses, convert between mass, moles and numbers of particles with dimensional analysis, and use percent composition data to work out empirical and molecular formulas.

  • 4 lessons
  • About 115 min
  • Quiz: 10 questions

Science · Grade 10

Stoichiometry and Conservation

Balanced equations become quantitative tools. Learners use mole ratios to predict amounts, carry out mass-to-mass calculations and check them against conservation of mass, decide which reactant runs out first, and compare the theoretical yield with what a real reaction produces.

  • 4 lessons
  • About 120 min
  • Quiz: 10 questions

Science · Grade 10

Gases and Particle Models

Learners use the kinetic-molecular model to explain gas pressure and temperature, then derive and apply the gas laws: Boyle's, Charles's, Gay-Lussac's, the combined law and the ideal gas law. They link gas volumes to stoichiometry and finish by asking when the ideal model breaks down for real gases.

  • 4 lessons
  • About 110 min
  • Quiz: 10 questions

Science · Grade 10

Solutions and Concentration

Learners explain dissolving with particle attractions ('like dissolves like'), separate how FAST something dissolves from how MUCH can dissolve, read solubility curves to predict crystallisation, and calculate concentrations as molarity and parts per million. They finish by planning safe dilutions with M₁V₁ = M₂V₂.

  • 4 lessons
  • About 110 min
  • Quiz: 10 questions

Science · Grade 10

Energy Changes and Reaction Rates

Learners track energy in reactions: they classify exothermic and endothermic changes from data and energy diagrams, measure heat with q = mcΔT, and estimate enthalpy changes from bond energies. They then explain reaction rates with collision theory and activation energy, analyse gas-volume data and design a fair rate investigation.

  • 4 lessons
  • About 120 min
  • Quiz: 10 questions

Science · Grade 10

Equilibrium, Acids and Bases

Learners discover that many reactions run in both directions and settle into a dynamic equilibrium, and they predict how equilibria respond to changes using Le Chatelier's principle. They then define acids and bases by proton transfer, connect pH to hydrogen-ion concentration on a logarithmic scale, balance neutralisation equations and calculate unknown concentrations from titration data.

  • 4 lessons
  • About 120 min
  • Quiz: 10 questions

Science · Grade 10

A Chemistry Investigation with Reviewed Lab Evidence

The chemistry capstone takes learners through a complete investigation of how temperature affects reaction rate: planning with a risk assessment, collecting and processing repeated measurements, analysing trends and uncertainty, and writing a lab report that a teacher reviews. A simulation provides practice data, and an optional supervised low-risk practical provides real evidence; the course is explicit about what each can and cannot establish.

  • 4 lessons
  • About 130 min
  • Quiz: 10 questions