A-Level · 9701 · Interactive simulations
33 unique simulations48 lessons2 sources
Every simulation here runs the real model — the applets a teacher would put on the board, from PhET and GeoGebra, not a video of one. Pick a topic, open a card inside its lesson to run it next to the notes, or jump straight to the source. A simulation that fits several lessons is listed under each of them (73 cards in all). Back to the A Level Chemistry course →
Add protons, neutrons and electrons: protons fix the element, neutrons change the mass number, and extra or missing electrons make an ion.
Fire alpha particles at an atom, then change their energy and the number of protons in the nucleus.
Add neutrons to make isotopes, then on Mixtures blend ¹⁰B and ¹¹B and watch the average atomic mass follow the abundances.
Add protons and neutrons to build a nucleus; the sim reports whether it is stable, its half-life and how it decays.
Energy levels for every subshell: slide the atomic number and the electrons fill the orbitals one at a time.
Shine light on a hydrogen atom and switch between the Bohr and Schrödinger models to compare orbits with orbital clouds.
Set two charges on the atomic scale and drag them closer or further apart; the force between them updates live.
On Mixtures, blend an element’s isotopes: the average atomic mass tracks their abundances — that weighted mean is the relative atomic mass.
Set the amount of solute in moles and the volume of solution, and read the concentration.
On Molecules, set the amount of each reactant and predict the product and the leftovers before you look: the limiting reactant decides the yield.
Adjust coefficients until the atoms on each side match; bar charts or balance scales show what is off.
Set the amount of solute in moles and the volume of solution, and read the concentration.
On Two Atoms drag each electronegativity slider, show Bond Character and watch the bond move from covalent towards ionic.
Two charges on the atomic scale: set the size of each charge and the distance between them, and read the force.
Add protons, neutrons and electrons to build an atom; the sim names the element and gives its net charge.
Shake salt or sugar into water, test the solution with a conductivity probe, then zoom in to the particles.
Build H₂, O₂, N₂ and CO₂ from the atom kits, then open each in 3D: every bond is a pair of electrons shared between two nuclei.
Drag one atom towards another and follow the potential-energy curve; compare a bonded oxygen pair with neon atoms.
Add bonding pairs and lone pairs — read the predicted VSEPR geometry (3.5).
On Three Atoms, change the electronegativities and bend the molecule: polar bonds make a polar molecule only when their dipoles do not cancel.
Heat or cool samples of neon, argon, oxygen or water and watch them melt and boil against a thermometer.
Hold one atom still, drag a second towards it and read the potential-energy curve for pairs of neon, argon or adjustable atoms.
Build H₂O, NH₃ and CO₂ from the atom kits and open the 3D view, then draw the dot-and-cross diagram for each: one shared pair per bond.
On Ideal hold the volume constant and heat the gas, then hold the temperature and shrink the box: track the pressure each time.
Squeeze and cool a gas of real particles under a movable lid until attractions make it condense.
A pressure–volume curve for a fixed amount of gas at constant temperature: set T and the two volumes.
Compare neon, argon, oxygen and water at one temperature: the stronger the forces between particles, the higher the temperature a substance stays together to.
Shake salt or sugar into water, test the solution with a conductivity probe, then zoom in to the particles.
Heat water and olive oil on the same burner: equal energy in, different temperature rises, because q = mcΔT and their specific heat capacities differ.
An energy profile for a reversible exothermic reaction, showing reactant, product and peak energy levels with Eₐ and ΔH.
A box of A and B molecules that keep turning into each other: add molecules or heat the box and watch the counts.
Compare Strong Acid and Weak Acid at the same concentration: view the molecules, then test pH and conductivity.
Test everyday liquids with a pH probe, dilute them with water and compare their H₃O⁺ and OH⁻ concentrations.
Launch one molecule at another, or fill a box with A and BC and heat it, and see which collisions react.
On Many Collisions, raise the temperature: more collisions clear the activation-energy barrier, so product forms faster.
The Maxwell–Boltzmann curve with sliders for temperature and molecular mass, and a marker you slide along the speed axis.
Pump gas into a box, heat or cool it, and watch live histograms of molecular speed and kinetic energy.
Switch the catalyst option on and off and compare the two peaks: do the reactant and product levels, or ΔH, change?
Hold one atom still, drag a second towards it and read the potential-energy curve for pairs of neon, argon or adjustable atoms.
Heat or cool samples of neon, argon, oxygen or water and watch them melt and boil against a thermometer.
Snap C, H and O atoms together into molecules; the sim names what you have built and shows it in 3D.
Give the central atom four single bonds, then swap two of them for one double bond: 109.5° opens to the 120° of a C=C carbon.
Snap carbon and hydrogen atoms together to make ethane and ethene, then turn each one as a 3D model.
Snap C, H and O atoms together into molecules; the sim names what you have built and shows it in 3D.
Change the coefficients in the methane combustion equation until every element balances; bar charts show what is off.
Add bonds to a central atom, or load real CH₄, and read the bond angles as the groups repel.
Attach single and double bonds to a central atom and watch the geometry and bond angles readjust.
Switch on bond dipoles and partial charges for real molecules, or set the electronegativity of two bonded atoms yourself.
View real molecules in 3D with their bond dipoles, partial charges and electrostatic potential surface.
Compare strong and weak acids of equal concentration: see the particles present, measure pH and test conductivity.
Look inside solutions of weak and strong bases: see which particles are present and measure the pH.
Build ethanol, then ethanoic acid (the sim calls it acetic acid): the same two-carbon skeleton with a different functional group — the change one synthesis step makes.
Select Infrared and fire photons at CO, CO₂ and H₂O, then at N₂ and O₂: which bonds stretch or bend, and which ignore the light?
Mix isotopes of an element and read the percentage of each alongside the average atomic mass.
Two charges on the atomic scale: change their size and separation and read the force between them.
Drop a salt crystal among water molecules and watch them pull ions out of the lattice and surround them.
Start with solid argon and heat it through liquid to gas: at each stage, how many ways could the particles be arranged?
Fill the two halves of a box with different gases, remove the divider and track how many of each end up on each side.
A bar chart of how many microstates give each way of sharing n particles between two states.
On My Solution slide the strength from weak to strong at a fixed concentration and watch [HA], [H₃O⁺] and pH respond.
Pick a liquid, dilute it, and see pH alongside the H₃O⁺ and OH⁻ concentrations.
A pH curve for a weak acid titrated with a strong base, with sliders for the acid volume, both concentrations and Ka.
Run A + BC → AB + C with chosen starting amounts and temperature while charts track each species.
An energy profile for an exothermic reaction with a catalysed route you can switch on and off.
Energy levels for every subshell: slide the atomic number and the electrons fill the orbitals one at a time.
On Beer's Law choose copper sulfate, make the wavelength variable and sweep it: which colours are absorbed most?
Adjust the wavelength of the incoming light and the electron energy levels until the light is absorbed.
Build six bonds around a central atom for an octahedron, or four bonds plus two lone pairs for a square plane, and rotate it.
Build ethanol, then join the same atoms as methoxymethane: the functional group, not the formula, decides the family and the name.
Switch on bond dipoles and partial charges for real molecules, or set the electronegativity of two bonded atoms yourself.
Set an acid's concentration and strength yourself and see the particles present, the pH and the conductivity.
Set a base's concentration and strength yourself and see the particles present and the pH.
Build ethanol, then ethanoic acid (the sim calls it acetic acid): the same two-carbon skeleton with a different functional group — the change one synthesis step makes.
Each simulation stays the property of its source and is credited on the card inside the lesson. Back to the A Level Chemistry course →