Pure Substances & Mixtures
Distinguish between pure substances and mixtures, identify formulations as useful mixtures with precise compositions, and use melting and boiling points to test for purity
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1858 concepts · 9 subjects
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Pure Substances & Mixtures means practising the idea at the table with a simple hands-on check. We will demo once, then your child tries.
Materials: Two everyday materials (e.g. ice cube / warm water / salt / spoon); Clear cup and paper for notes. 1. Say the goal of Pure Substances & Mixtures in plain words once. 2. Adult shows one property or state change and names solid/liquid/gas or a material property. 3. Child tests three samples and records a property or state observation each time. 4. Fresh check: one fresh property or state observation. Record and stop. Done: three property/state notes with evidence. Proof: parent note of examples and results. Stop: End after the fresh check; keep optional challenge for another day.
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Practice key ideas from Pure Substances & Mixtures.
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Learning resources
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PhET Interactive Simulations · Practice link — not the full lesson
States of Matter: Basics
Before you open · source notes
States of Matter: Basics supports hands-on exploration for Pure Substances & Mixtures. Not every lab worksheet.
Free interactive page, no sign-in required for the tested path.
Before you openAsk the learner what they changed in the sim or page and what they observed.
Opening this link does not save learning or assess mastery.
Source, access and review notes
Public PhET Interactive Simulations page. An anonymous GET on 2026-11-12 returned HTTP 200 with no login or payment prompt for this URL. Opening the link does not save practice or assess mastery. An adult should preview and guide the learner.
PhET Interactive Simulations. “States of Matter: Basics.” External page; Gakuva does not copy, host, embed, or redistribute materials.
Unknown — link only
Check understanding
- Explains why a pure substance has a sharp, fixed melting point but a mixture melts over a range
- Identifies common formulations (medicines, alloys, paints, fuels) as deliberate mixtures
- Explains what impurities do to melting and boiling points
- Distinguishes mixtures from compounds at the particle level
“If your child was checking whether a sample of water was pure, could they explain one test they could do — and say what result would tell them it was definitely pure versus a mixture?”
Curriculum record
- Type
- Conceptual
- Subject
- Science
- Domain
- Matter & Materials
- Age range
- Ages 11–13
Standards