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Elements, Compounds and Mixtures
A free video lesson on elements, compounds and mixtures — what atoms are, how the periodic table is organised, and how mixtures can be separated back into their parts. Followed by real quiz questions, marked instantly. No account needed.
What's the difference between an element, a compound and a mixture? This lesson explains atoms and the periodic table, how compounds form (and behave differently from their elements), and how to separate mixtures by filtering, evaporation, distillation and chromatography. It is part of Learning Hub, a UK-curriculum learning site built by a home-educating family. Watch, try the questions, then make a free account to unlock every subject.
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Questions parents ask
- What is the difference between an element, a compound and a mixture?
- An element is made of only one type of atom (like oxygen or iron). A compound is two or more elements chemically joined (like water, H2O). A mixture is substances mixed together but not chemically joined (like air or salt water) — its parts keep their own properties and can be separated.
- How do you separate mixtures?
- By physical methods: filtering (an insoluble solid from a liquid), evaporation (a dissolved solid back from a liquid), distillation (collecting the pure liquid), and chromatography (separating coloured dyes). No chemical reaction is needed.
- Is this suitable for KS3 and GCSE?
- Yes. Elements, compounds and mixtures is a core chemistry topic for Years 9 to 11 (KS3 and GCSE), and this lesson and quiz work as a clear introduction to it.
- Is it really free?
- The video and these questions are free with no account. The full site — every subject for Years 6 to 11, mock papers, learning games and full reading support for dyslexia — is £6.99 a month for the whole family, with a 14-day free trial and no card needed to start.