EdBlog
Education tips, exam guides, parenting advice and the latest in EdTech — all from the Myedupady team.
Physical and Chemical Changes
Every day, matter around you is changing — ice melts, paper tears, bread toasts, iron rusts. But not all changes are the same. Some changes are physical, and some are chemical — and knowing which is which is one of the most important foundations in KS3 and GCSE Science. This guide breaks down the difference clearly, with real examples and a free practice quiz at the end.
Types of Chemical Reactions
From the food you digest to the fuel that powers engines, chemical reactions are happening everywhere. This complete guide covers all eight major types of chemical reactions — synthesis, decomposition, single displacement, double displacement, combustion, redox, acid-base and precipitation — with word equations, symbol equations, real-world context, a summary table, common mistakes to avoid, eight frequently asked questions, and an 8-question multiple choice quiz with answers and explanations to test your understanding.
Combustion Reactions Explained
Combustion is burning — when a fuel reacts with oxygen and releases heat. The fire triangle shows that fuel, heat, and oxygen are all needed for burning to happen, and removing any one stops the fire. Combustion is a type of oxidation reaction, since it involves a substance combining with oxygen to form oxides. When hydrocarbon fuels (containing carbon and hydrogen) burn with plenty of oxygen, complete combustion occurs, producing carbon dioxide and water. If oxygen is limited, incomplete combustion happens instead, producing toxic carbon monoxide and/or soot alongside water. This is why good ventilation matters when using gas appliances. Combustion reactions can be written as word equations (fuel + oxygen → carbon dioxide + water) or balanced symbol equations, such as butane's: 2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O.
Changes of State: Melting, Freezing, Evaporation and More
Ice melting in a drink. Steam rising from a hot shower. Frost forming on a cold window at night. All of these are changes of state happening right in front of you. Learn exactly what is happening to the particles (and why) in this complete guide.
Solids, Liquids and Gases: The Three States of Matter
Everything around you is made of matter. But not all matter behaves the same way. Some things you can hold. Some you can pour. Some are invisible. Find out why with this complete guide to the three states of matter.
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