Gallery
Discover apps people built on Collabby by chatting. Run them, then remix to make them yours.
Entropy and Reaction Spontaneity
Raise the temperature far enough and a reaction that refused to happen suddenly runs on its own.
Enthalpy and Hess’s Law
The heat of a reaction depends only on the start and end levels, never on the path taken.
Boyle’s and Charles’s Laws & Ideal Gases
Squeeze a gas and it shrinks, heat it and it swells, with pressure, volume and temperature always tied together.
Simple Harmonic Motion & Pendulum Periods
A pendulum's period is set by its length and gravity, never by the mass of the bob.
Torque & Rotational Balance
The same push turns a bolt more or less depending on where and at what angle it is applied.
Energy Levels & Line Spectra
The size of the jump an electron makes between levels is exactly the color of light you see.
The Photoelectric Effect and Light’s Particle Nature
Red light never ejects an electron no matter how bright, but change its color and they pop out at once.
Galvanic Cells & Electrolysis
Create voltage from the potential difference between two metals, and explore electrodes dissolving and building up, plus the 2:1 ratio of gases produced by electrolysis.
Reaction Rate & Activation Energy
Change collision frequency with concentration, increase particles crossing the activation-energy barrier with temperature and catalysts, and explore the half-life of a first-order reaction.
Lewis Dot Structures & Molecular Shapes
Adjust bonding electrons and electron pairs around the central atom to create molecular shapes and bond angles, then use electronegativity differences to determine bond polarity.
Electric Fields & Potential
Change electric field lines by varying the sign and size of charges, and see how Coulomb force and potential change with distance.
Heat Engines & Efficiency
Calculate efficiency from heat in and work done, then explore the limit set by two reservoir temperatures and the area of a P–V loop.
Parabolic Motion
Change the angle and speed to compare range and peak height, and see that a horizontally thrown ball and a dropped ball are at the same height.
Resources & Energy
Burn oil and watch the gauge fall, then mix solar, wind, and hydro to keep the town powered even at night while cutting monthly use.
Additive Color Mixing
Overlap red, green, and blue light and change the lamp to see that an object's color comes from the light it reflects.
Chemical Equilibrium
Change concentration, pressure, and temperature to see equilibrium shift in the direction that counteracts each disturbance.
Different Gases
Weigh air itself, change temperature and pressure to watch a balloon's volume shift, and run tests to tell oxygen, carbon dioxide, nitrogen and helium apart.
Acid–Base Titration
Add base drop by drop to an acid to locate the equivalence point, and see why the pH curve turns steep there and when methyl orange, BTB, and phenolphthalein change color.
How Electric Motors Work
Flip the current and field directions, then toggle the commutator to see why a motor keeps spinning one way.
Balanced Forces and Friction
Balance F1 against F2 to zero the net force, then vary the slope angle and the friction coefficient to catch the instant static friction gives way to kinetic friction.
Electromagnetic Induction
Vary the magnet's speed and the number of coil turns to measure the induced EMF, then flip the pole to see Lenz's law oppose the change.
Elements and Compounds
Set the proton count to decide an element, read chemical formulas, and link atoms into molecule models.
Conservation of Mechanical Energy
Potential and kinetic energy trade off as you vary the release height and switch friction on, showing when their sum stays constant.
Redox Reactions
Follow a metal losing electrons as its oxidation number rises, then balance the equation by matching electrons lost with electrons gained.