https://sciencedemy.com/articles/ Interactive chemistry explainers from Science Academy en https://sciencedemy.com/articles/electrolysis-explained/ https://sciencedemy.com/articles/electrolysis-explained/ Wed, 21 Oct 2026 00:00:00 GMT Electrolysis splits ionic compounds with electricity. Learn what forms at the cathode and anode, how to write half equations, why brine gives hydrogen, and try it in 3D. https://sciencedemy.com/articles/exothermic-and-endothermic-reactions/ https://sciencedemy.com/articles/exothermic-and-endothermic-reactions/ Wed, 21 Oct 2026 00:00:00 GMT Exothermic reactions give out heat; endothermic ones take it in. Learn why, read energy profile diagrams, work out ΔH from bond energies and watch molecules react in 3D. https://sciencedemy.com/articles/how-temperature-affects-enzymes/ https://sciencedemy.com/articles/how-temperature-affects-enzymes/ Wed, 21 Oct 2026 00:00:00 GMT Warmth speeds enzymes up until the optimum, then heat denatures them for good. The rate graph explained, plus the effect of pH, the lock and key model and exam answers. https://sciencedemy.com/articles/ionic-vs-covalent-bonds/ https://sciencedemy.com/articles/ionic-vs-covalent-bonds/ Wed, 21 Oct 2026 00:00:00 GMT Ionic bonds transfer electrons and make charged ions; covalent bonds share them. Learn to tell them apart, compare their properties in a table and build molecules in 3D. https://sciencedemy.com/articles/ohms-law-explained/ https://sciencedemy.com/articles/ohms-law-explained/ Wed, 21 Oct 2026 00:00:00 GMT Ohm's law links voltage, current and resistance: V = IR. Learn the formula triangle, the units, three worked examples, the I–V graphs and the mistakes that cost marks. https://sciencedemy.com/articles/states-of-matter/ https://sciencedemy.com/articles/states-of-matter/ Wed, 21 Oct 2026 00:00:00 GMT Solids, liquids and gases are the same particles with different amounts of energy. See how they move, why melting and boiling stay at one temperature, and heat ice in 3D. https://sciencedemy.com/articles/best-angle-for-maximum-range/ https://sciencedemy.com/articles/best-angle-for-maximum-range/ Tue, 20 Oct 2026 00:00:00 GMT Why 45° throws a projectile the farthest, why 30° and 60° land in exactly the same spot, and why shot-putters, golfers and air resistance all pull the angle lower. https://sciencedemy.com/articles/red-blood-cell-in-salt-water/ https://sciencedemy.com/articles/red-blood-cell-in-salt-water/ Tue, 20 Oct 2026 00:00:00 GMT In pure water a red blood cell swells and bursts; in strong salt water it shrivels. See how osmosis decides which, why drips use 0.9% saline, and what plant cells do. https://sciencedemy.com/articles/animal-cell-vs-plant-cell/ https://sciencedemy.com/articles/animal-cell-vs-plant-cell/ Sat, 17 Oct 2026 00:00:00 GMT Plant and animal cells share most of their parts. Here are the real differences (cell wall, chloroplasts and a big vacuole), why each exists and the classic mix-ups. https://sciencedemy.com/articles/how-dna-makes-a-protein/ https://sciencedemy.com/articles/how-dna-makes-a-protein/ Sat, 17 Oct 2026 00:00:00 GMT A gene is a recipe written in four letters. See how a cell copies it into mRNA, reads it three letters at a time, builds a protein, and what a one-letter mistake does. https://sciencedemy.com/articles/how-to-find-g-with-a-simple-pendulum/ https://sciencedemy.com/articles/how-to-find-g-with-a-simple-pendulum/ Sat, 17 Oct 2026 00:00:00 GMT Measure the acceleration due to gravity with a string and a weight: the method, the T² against L graph, a worked example and the errors that pull you away from 9.81. https://sciencedemy.com/articles/how-to-read-a-vernier-caliper/ https://sciencedemy.com/articles/how-to-read-a-vernier-caliper/ Sat, 17 Oct 2026 00:00:00 GMT A step-by-step guide to reading a Vernier caliper to 0.1 mm or 0.02 mm, with worked examples, the least count, zero error and the mistakes that cost marks in exams. https://sciencedemy.com/articles/why-fireworks-are-different-colours/ https://sciencedemy.com/articles/why-fireworks-are-different-colours/ Sat, 17 Oct 2026 00:00:00 GMT Firework colours come from electrons jumping between energy levels in metal atoms. Here's how it works, why each metal has its own colour, and how flame tests use it. https://sciencedemy.com/articles/what-is-an-isotope/ https://sciencedemy.com/articles/what-is-an-isotope/ Mon, 12 Oct 2026 00:00:00 GMT Isotopes are atoms of the same element with different numbers of neutrons. Learn what that means, why some isotopes are radioactive, and build one yourself in 3D.