Every live practical, in one place.
Click any lab to open it. Each one is a self-contained 3D simulation, drag to rotate, sound is optional, no install. Observation wording is taken straight from NSSCO Annexe B and Cambridge mark schemes.
Iodine · Benedict's · Biuret · Emulsion. Test an unknown food sample for starch, sugar, protein and lipid.
Run all four food tests on six real foods. Predict the nutrient profile of each, then check the mark scheme.
Burn a peanut/cashew/marshmallow under a tube of water. Use q = mcΔT to find kJ per gram, compared to published values.
Boil, decolorise, stain. Predict whether each prepared leaf will turn blue-black after iodine.
Count O₂ bubbles from Elodea. Vary lamp distance, CO₂ and temperature. Plot rate vs light intensity.
Three bagged leaves: soda lime, sodium bicarbonate, water control. Predict which photosynthesise.
Variegated leaf through the standard starch test, only green regions go blue-black. Chlorophyll is required.
Time the decolourisation of DCPIP by isolated chloroplasts.
U-tube limewater apparatus. Exhaled side goes milky much faster, exhaled air contains more CO₂.
Live vs dead seeds in insulated flasks. Live flask warms up, direct evidence respiration releases energy as heat.
Compare rate of O₂ uptake in germinating peas, maggots, woodlice. KOH absorbs CO₂; manometer measures the gap.
Five water baths (5, 20, 35, 50, 65 °C). Sample with iodine every 30 s. Optimum around 35 °C; denatured at 65 °C.
Five buffered tubes (pH 3, 5, 7, 9, 11). Rate peaks at pH 7; falls steeply outside the optimum range.
Yeast-filter-paper disc rise time at six H₂O₂ concentrations. Rate rises then plateaus, saturation of active sites.
Six sucrose concentrations. Mass change over 60 min. Crossing point on graph gives potato's water potential.
Three sizes of phenolphthalein-NaOH agar cube in HCl. Small cube decolourises first, high SA:V wins.
Bag of starch + glucose in water. Glucose passes through, starch does not. Models partial permeability.
Time the air bubble in a capillary under five conditions: still, wind, light, humid bag, heat.
Celery in red dye. Cross-section reveals dye traces the xylem vessels, water transport tissue.
Cheek epithelium (methylene blue) and onion epidermis (iodine). Click features to identify and compare.
Field of 24 onion-root-tip cells stained with aceto-orcein. Classify each cell; calculate mitotic index.
Pick parental genotypes. See Punnett square. Run 1000 offspring trials and compare observed vs expected ratios.
Sample a student population for height (continuous) and tongue-rolling (discontinuous). Compare histograms.
Identify cations and anions. NaOH, ammonia, AgNO₃, BaNO₃, flame tests. Wording from NSSCO Annexe B.
Grind, dissolve, filter, evaporate. Obtain dry NaCl crystals. Quiz on the exam vocabulary.
Flame colours (Li, Na, K, Ca, Ba) and gases (H₂, O₂, CO₂, NH₃, Cl₂) tested with the standard reagents.
Spot the setup error, run the chromatogram, interpret Rf and number of dyes.
Distil wine to separate ethanol from water. Watch the temperature plateau at 78 °C.
Watch where the white ring of NH₄Cl forms, and verify Graham's law from the position.
Drop Li, Na and K into water. Compare vigour. Potassium burns with a lilac flame.
Six electrolyte / electrode combinations. Identify products at cathode and anode; check half-equations.
One blue solution, two electrodes. The blue fades with carbon but holds forever with copper. Live Faraday's-law readouts: charge, electrons and mass of Cu deposited.
Plate a zinc cathode with copper. Calculate the deposited mass from Q = It and Faraday's law.
Heat KClO₃ + MnO₂. Collect O₂ in a gas syringe. Tabulate, plot V vs t, answer the kinetics questions.
Drop magnesium ribbon into HCl at different concentrations. Time to dissolve → rate vs [HCl].
Five experiments with different [I⁻]. Time to blue-black. Plot rate vs [I⁻].
The disappearing cross. Time how long until sulfur clouds the solution at five concentrations.
Burette of NaOH, flask of unknown HCl + phenolphthalein. Calculate the concentration of the acid.
Precipitate PbI₂, BaSO₄, AgCl or Fe(OH)₃ by mixing two soluble salts. Filter, wash, dry.
Acid + insoluble base (or carbonate). Filter the excess, evaporate the filtrate, grow crystals.
Titrate Fe²⁺ from a dissolved iron alloy against standardised KMnO₄. Calculate the % iron.
Mix HCl and NaOH in a styrofoam cup. Use q = mcΔT to find ΔH per mole of water formed.
Drop four metals into four salt solutions. Build up the reactivity order from the displacement matrix.
Yeast + glucose → ethanol + CO₂ over 7 days. Then distil to concentrate the ethanol.
Test six substances for unsaturation. Alkenes and unsaturated fats decolourise orange Br₂; alkanes don't.
Time oscillations at several lengths. Plot T² vs L → slope gives gravity.
Hang masses one at a time. Plot F vs extension. Beyond the elastic limit the line bends.
Mass on a balance + volume from water rise. Identify the material from its density.
Tilt the plank until the block just slides. μ = tan θ at the slipping angle.
Light through a glass block at varying angles. Plot sin i vs sin r → refractive index.
Bench, object, lens, screen. Find sharp images at five u-values. Calculate f from 1/u + 1/v = 1/f.
Drag the incident ray. Confirm the angles of incidence and reflection are equal at five angles.
Electric heater, water, thermometer. Calculate c from VIt = mcΔT and explain the inefficiency.
Squeeze a sealed gas column. PV stays constant, and 1/V vs P is a straight line through the origin.
Vary V across a 10 Ω resistor. Read I. Plot V vs I, gradient gives R.
Slide a jockey along a constantan wire. R is proportional to L. Gradient gives Ω/m.
Wrap an iron nail. Vary N and I. Count the paperclips you can pick up.
Find loud resonance in an air column. Two resonances give λ → v = fλ → speed of sound.