Choose a physical separation from properties
See this course’s project requirements
A particle-model notebook explaining states, mixtures, elements, compounds, mass conservation and a physical separation plan from supplied materials.
Keep your working files in your own notebook or software. Save a private description, checklist, and work link in My Proof.
What to include
- Separate measurements from particle explanations.
- Compare solid, liquid and gas models without inflating individual particles.
- Classify all supplied element, compound and mixture drawings.
- Name state transitions while preserving substance identity.
- Balance the supplied closed-system mass stores.
- Choose paper separation methods by recovery goal and complete changed cases.
Review and revise
Use these criteria to check your work and choose what to improve.
- Method: applies the course-specific rules to the supplied cases with visible intermediate work.
- Accuracy: results agree with the stated facts, units, boundaries and independent checks.
- Reasoning: explains why the result follows and identifies a limitation or unresolved question.
- Transfer: completes changed cases and revises the final project when a relevant assumption changes.
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The idea in everyday life
Supplied mixture cards: X—water with insoluble coarse sand that the supplied filter retains; Y—water with dissolved salt that passes that filter. Goal for X: recover sand. Goal for Y: recover salt only. No real mixture, heating or disposal task is required.
A physical separation uses a difference in properties without requiring a new substance. A filter can retain sufficiently large insoluble particles while fluid passes; dissolved particles usually pass ordinary filters. Evaporation can leave a nonvolatile dissolved solid, but loses the solvent unless it is captured. Choose the method for the stated recovery goal, and use this as paper reasoning only.
Choose a physical separation from properties — worked practice
A physical separation uses a difference in properties without requiring a new substance. A filter can retain sufficiently large insoluble particles while fluid passes; dissolved particles usually pass ordinary filters. Evaporation can leave a nonvolatile dissolved solid, but loses the solvent unless it is captured. Choose the method for the stated recovery goal, and use this as paper reasoning only.
Supplied mixture cards: X—water with insoluble coarse sand that the supplied filter retains; Y—water with dissolved salt that passes that filter. Goal for X: recover sand. Goal for Y: recover salt only. No real mixture, heating or disposal task is required.
1. 1. Property
Compare what the supplied filter retains.
You should see: It retains the coarse sand but not the dissolved salt in the supplied cards.
2. 2. Choose
Select a paper method for recovering X’s sand.
You should see: Filtration; the retained sand is the target fraction.
3. 3. Choose
Select a paper method for recovering only Y’s nonvolatile salt.
You should see: Evaporation under the model’s conditions would leave salt but would not preserve liquid water.
4. 4. Limit
Explain how a water-recovery goal changes the question.
You should see: A capture/condensation method would be needed; this lesson does not authorize equipment or certify drinking safety.
What to finish
A property/method/recovery table with an explicit unaddressed safety boundary.
Watch for this
A solvent-losing method may serve a solid-recovery goal but fail a water-recovery goal. Method selection depends on both properties and the desired fraction.
How can I tell I understand it?
Choose a changed paper method without performing or certifying a physical experiment.
Quick knowledge check
Answer all 3 questions. Get at least 2 right and the lesson completes automatically.
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Answer all 3 questions above and get at least 2 right. You can review the explanations and try again.
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Source & access notes · checked 2026-10-01
Web open/search showed the official page, its topic heading and relevant concept description. This is a content/source check, not a provider endorsement.
Access: Official page retrieved with the web reader on 2026-10-01; interactive tools and videos were not certified by retrieval.
Reuse: Original fictional teaching cases, calculations, questions and examples; link and short factual paraphrase only. No copied source exercises or illustrations.
Source & access notes · checked 2026-10-01
Web open/search showed the official page, its topic heading and relevant concept description. This is a content/source check, not a provider endorsement.
Access: Official page retrieved with the web reader on 2026-10-01; interactive tools and videos were not certified by retrieval.
Reuse: Original fictional teaching cases, calculations, questions and examples; link and short factual paraphrase only. No copied source exercises or illustrations.
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