Embed our interactives — free
Every interactive below is free to embed on your site, blog, or LMS — no signup, no ads in the embed. Copy the snippet; a small attribution link to PrepOK is included. Teachers and creators welcome.
- Atomic Mass & Isotopes Calculator chemistry
See why atomic mass is a decimal: it is the abundance-weighted average of an element's isotopes. Slide the isotope mix for chlorine, boron, or copper and watch the average.
- Bond & Molecular Polarity chemistry
Compare two atoms to see δ+/δ−, the dipole arrow, ΔEN, and bond type — then check whether a whole molecule is polar or cancels by symmetry.
- Electron Configuration Builder chemistry
Pick any element from hydrogen to krypton and watch its ground-state electron configuration and Bohr shell diagram build up in Aufbau order — including the chromium and copper exceptions.
- Interactive Animal Cell biology
Click or tab through a labeled animal cell to explore the nucleus, mitochondria, endoplasmic reticulum, Golgi apparatus, ribosomes, lysosome, vacuole, and more — each with its job explained.
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Build the Bohr model of any element (Z 1-118). Pick an atomic number to see the nucleus and electron shells fill, with electrons-per-shell and outer-shell count.
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Drag a point around the Cartesian grid to read its (x, y) coordinates and quadrant, snap to whole numbers, and reveal its reflections across the x-axis, y-axis, and origin.
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Hover or arrow-key across a 12×12 multiplication chart to light up any times-table fact, with an area model that shows why a × b is a rectangle of that many squares.
- Interactive Ohm's Law Calculator physics
Set any two of voltage, current, and resistance and watch the third solve itself with V = I × R. A live circuit lights a bulb whose brightness tracks the power.
- Interactive Periodic Table chemistry
Explore all 118 elements in an interactive periodic table: recolor by category, state, or block, and open any element for its electron configuration, Bohr model, and uses.
- Interactive pH Scale chemistry
Slide across the 0–14 pH scale to see each value's acidity classification, its hydrogen-ion concentration [H⁺] = 10⁻ᵖᴴ, and a familiar everyday substance at that pH.
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Drag a point around the unit circle to see the angle in degrees and radians, plus sine, cosine, and tangent — with exact values at common angles like 30°, 45°, and 60°.
- Interactive Wave Explorer physics
Animate a travelling wave, adjust its amplitude, wavelength, and frequency, switch between transverse and longitudinal motion, and watch wave speed (v = f × λ) and period (T = 1/f) update live.
- Ionic vs Covalent Bonds (and Metallic) chemistry
Pick two elements and compare their electronegativity. The ΔEN difference predicts an ionic, covalent (polar or nonpolar), or metallic bond.
- Lewis Dot Structures chemistry
Draw the Lewis dot structure of common molecules. See bonds as lines, lone pairs as dots, count valence electrons, and meet the octet-rule exceptions.
- Molecular Geometry (VSEPR) chemistry
Pick a molecule and watch VSEPR predict its 3D shape. See how lone pairs and bonding regions set the geometry, bond angle, and hybridization.
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A free build-a-molecule game: tap atoms into the tray, bond them, and watch real molecules snap together. Take on challenges or free-build to discover all 14.
- Noble Gases (Group 18) Explorer chemistry
Explore the noble gases of group 18 — helium, neon, argon, krypton, xenon, radon, and oganesson — and see why a full outer shell makes them so unreactive.
- Periodic Table Game: Find the Element chemistry
A free, fast periodic table game — we name an element, you race to click it on the table. Beat your best time, learn where every element lives, no signup.
- Periodic Trends Heat-Map chemistry
Color the periodic table by electronegativity, ionization energy, or electron affinity. See how each trend moves across periods and down groups.
- The Electromagnetic Spectrum physics
Slide along the electromagnetic spectrum from radio waves to gamma rays and watch wavelength, frequency, and photon energy update together — with a rainbow swatch in the visible band.
- The Water Cycle earth-science
Click through an interactive water-cycle scene — evaporation, condensation, precipitation, and collection (plus transpiration and runoff) — with a kid-friendly explanation for each stage.
- Valence Electrons & Lewis Dot Symbols chemistry
Pick a main-group element and see its Lewis electron-dot symbol. Learn the group rule that gives valence electrons for groups 1, 2, and 13 to 18.