A complete, free set of one-page knowledge organisers for Edexcel IGCSE Chemistry (4CH1) — all 28 topics, built for active revision. Download any topic below.
This Week in Science: Longevity Genes, Quantum Metal and a Slingshot Past Mars
From a borrowed gene that helped mice live longer, to a chunk of metal that managed to be in two places at once, this week's stories cross the full sweep of science. We've also got salamanders, a spacecraft preparing to slingshot past Mars, and a warning from cardiologists about what's on your plate.
Boost Your Teaching Efficiency with Teacher Marking Assistant
Practical-Science readers Get 30% off any plan with code VZLLHRPN — valid until 31 June 2026. Includes a 30-day free trial, no credit card required. Try Teacher Marking Assistant What if marking could fit into the gaps of a teacher’s day — the ten minutes in the staff room, the bus ride home, the lull before … Continue reading Boost Your Teaching Efficiency with Teacher Marking Assistant
This Week in Science: Mars Molecules, Sideways Crabs and a Triangle That Could Replace Platinum
From a rover sniffing out building blocks of life on Mars to a triangular aluminium molecule that could replace platinum, this week's science had something for nearly every classroom. We've also got two faults that may quake together, a 200-million-year-old crab habit, deep ocean heat creeping toward Antarctica, and what your morning coffee might be doing to your gut bacteria.
Calculating Percentage Errors in Experimental Data — Perfect for the IBDP Chemistry Internal Assessment IA
A clear, step-by-step guide to working out percentage errors in chemistry practicals — from equipment uncertainty through to a final answer with an honest ± value. Includes a downloadable PowerPoint and a fully worked titration example using a self-prepared sodium carbonate standard.
This Week in Science: From a 600-Million-Year-Old Cyclops to a Map of 47 Million Galaxies
Welcome to this week's roundup of science stories making waves around the world. From a 600-million-year-old "cyclops" ancestor that may explain why your eyes look the way they do, to the largest 3D map of the universe ever made, this week's stories span 600 million years of biology, the slow tearing apart of a continent, brain-inspired computing, and a literary discovery hidden inside an Egyptian mummy. Let's dive in.