Chemistry: investigate the world of substances
Learn chemistry through safe investigations, support maps, 3D visuals, error analysis and retrieval practice.
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Every lesson is open: reading needs no account.
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Where did the salt go? Start a chemistry investigation
Begin with a testable question and rules that keep the investigation safe.
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Glass, glassware and transparency: three different answers
Distinguish an object, its material and a property so a thing is not confused with a feature.
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Tap water, air and salt: which is a mixture?
Discover why a clear, uniform-looking material may contain several substances.
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Dissolving without vanishing: a particle model
Connect visible stirring to an invisible model and distinguish dissolving from melting.
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Recovering salt from a mixture: settling, filtering, evaporation
Finish the investigation by choosing separation methods from properties and stating their limits.