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.
- Balancing Chemical Equations chemistry
Set the coefficients on a real reaction and watch a live atom tally check both sides. Learn why every element must balance (conservation of mass) with steppers and a 'Show me' answer.
- 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.
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Click any organelle on a labeled cell to see its one-line job, then flip to a name-that-job quiz that scores you. Covers the nucleus, mitochondria, ER, Golgi, ribosomes, and the plant-only parts.
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Set two carts' masses, speeds, and elasticity, then collide them. Momentum is conserved in every collision, elastic or inelastic, but kinetic energy is lost unless the collision is perfectly elastic.
- 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.
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Pull a block and watch static friction rise to match your force until it breaks free and slides under a lower, constant kinetic friction, with a live force-vs-pull graph and coefficient sliders.
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Drop a hammer and a feather with air resistance on or off, on Earth, the Moon, Mars or Jupiter. In a vacuum they land together, because free-fall acceleration g is the same for every mass.
- 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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Enter any two of force, mass, and acceleration and this F = ma calculator solves the third instantly, with a free-body box that accelerates and a worked-steps line for every answer.
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Drag points to shape a distance-time or velocity-time graph and a runner moves to match. See why slope is speed or acceleration, and the area under a velocity-time line is distance.
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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.
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One sandbox for all three of Newton's laws: glide with no net force, accelerate at a = F/m on a live velocity-time graph, and push off to see equal and opposite forces.
- 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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Toggle one cell between plant and animal to watch the cell wall, chloroplasts, and large central vacuole appear while the shared parts stay. Includes a turgor slider and a live plant-vs-animal Venn.
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Set launch speed and angle, fire the projectile, and watch it trace a real parabola. Read range, maximum height and time of flight, and see why 45 degrees gives the longest range.
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Change a lever, ramp, pulley, or wheel and axle and watch mechanical advantage and effort force update live. Every simple machine trades distance for force, so work in equals work out.
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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.
- Mole Ratios & Stoichiometry chemistry
Use a balanced equation as a recipe: coefficients give the mole ratio, molar mass converts grams to moles, and one ratio hop takes you from any substance to another.
- 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.
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Drag the force arrows on an object and the net force updates live, with a balanced-or-unbalanced verdict. Build free-body diagrams and find when an object accelerates.
- 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.
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A live membrane splits a beaker of water and solute particles. Watch osmosis pull water to the saltier side, diffusion spread solute out, tonicity swell or shrink a cell, and a pump spend ATP.
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Drag a, b, and c on a live graph of y = ax² + bx + c and watch the vertex, axis of symmetry, roots, and y-intercept respond, with the vertex formula, discriminant, and a full worked example.
- 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.
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Drag one anchor point and set a slope: the point-slope equation writes itself with live numbers, next to the same line rewritten in slope-intercept form.
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Drag points A and B on a grid and watch the dashed rise-over-run triangle, the slope formula, and the line's equation update live, including the zero and undefined slope cases.
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Drag the Slope m and Intercept b sliders and the line y = mx + b redraws live: b pins the y-intercept at (0, b), m sets the rise for every run of 1, with a worked graphing recipe and examples.
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Add heat to ice and watch it melt then boil on a live heating curve: the temperature plateaus at 0 and 100 °C while energy breaks bonds. Covers the states, phase changes, and latent heat.
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Steer two lines with slope and intercept sliders; the crossing point is the solution of the system. Make the slopes equal to see the parallel (no solution) and same-line (infinitely many) cases.
- 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.
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Pick a gas law and the held-constant quantities lock; drag the one free control and watch pressure, volume, and temperature respond, with every formula, graph, and worked example in real units.
- The Mole & Molar Mass chemistry
Pick a substance to see its molar mass built up element by element, then convert freely between moles, grams, and particles with Avogadro's number.
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Heat, squeeze, and cool a live box of atoms to watch pressure, the speed distribution, and even melting and boiling emerge from the collisions. Kinetic theory you can play with.
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A live, interactive orrery: every planet and dwarf planet on its real orbit from NASA/JPL data. Press play to run time forward and watch the inner planets race while the outer giants crawl.
- 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.
- Types of Chemical Reactions chemistry
Classify reactions as synthesis, decomposition, single replacement, double replacement, or combustion, then use each pattern to predict the products.
- 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.
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Drag the parabola's vertex and h and k follow it in y = a(x - h)² + k; stretch or flip with a against the y = x² ghost, and watch the expanded standard form rewrite itself live.