Separation efficiency depends on a contrast in physical properties and on operational conditions. Here idealised magnetic selection and size exclusion illustrate the mechanisms. Molecularly dispersed solutes generally pass through ordinary paper filters; specialised membranes behave differently. No reaction is implied by sorting components, and removal of visible solids should not be mistaken for disinfection or drinking-water certification.
Matter and chemistry · Discover & try
How can a mixture be separated without a reaction?
Reading level 5 of 5 · AdvancedChange
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mixture
Materials together without a single fixed chemical composition.
filtration
Separating some components using a barrier that permits others to pass.
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Virtual magnetic and size-based sorting; ordinary filter behaviour is simplified and does not certify safe water.
What to look for
- A tool needs a property difference
- Dissolved material is not suspended sand
- Components are sorted rather than created
Explain what you noticed
Sugar has fully dissolved in water. Will an ordinary paper filter collect the sugar like grains of sand?
Keep this idea: Match a separation mechanism to a useful property difference.
Follow the sources
- University of California San Diego — Separating Mixtures: Teacher Version
- U.S. Environmental Protection Agency — Filtration
Source material checked 2026-10-29. Explanations and activities by Nepedia. Source links do not imply endorsement.
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