Science Lesson Kit · Teacher Resource
Mixtures & Solutions: Dissolve, Separate & Recover Matter — 5E Lesson Plan
Physical Science · 55 minutes
Grade 5
5E lesson flow
01
Engage
7 min
Teacher Does
Show a mixed sample of sand and salt and ask whether the original materials can be recovered.
Students Do
Propose property-based methods.
Ask
- Which property could help separate these materials?
Look For
Particle size or solubility reasoning.
02
Explore
15 min
Teacher Does
Guide stations for magnetism, sieving, dissolving, and filtration.
Students Do
Test methods and record what each method can and cannot separate.
Ask
- What property makes this method work?
Look For
Method-property connection.
03
Explain
10 min
Teacher Does
Formalize mixture, solution, dissolve, soluble, insoluble, filtration, evaporation, and separation.
Students Do
Build a separation-method concept map.
Ask
- Why is a solution still a mixture?
Look For
Dissolved substances remain part of the material system.
04
Elaborate
15 min
Teacher Does
Present the three-component mystery mixture and prepared recovery evidence.
Students Do
Plan a sequence and justify each step.
Ask
- What should happen first, and why?
Look For
Efficient property-based sequence.
05
Evaluate
8 min
Teacher Does
Assign the separation-and-new-substance evidence task.
Students Do
Write a plan and careful claim.
Ask
- What evidence shows whether a new substance formed?
Look For
Recovery and matching-property evidence.
Student goal
I can use material properties to separate mixtures and use evidence to decide whether mixing formed a new substance.
Learning objectives
- Distinguish mixtures from solutions using observable evidence.
- Choose separation methods that match material properties such as particle size, magnetic response, solubility, and phase.
- Use recovery and property evidence to make a careful claim about whether mixing produced a new substance.
Materials
- Sand
- Salt
- Teacher-approved magnetic material
- Water
- Filters and funnels
- Magnets
- Sieves
- Prepared recovery evidence
Before class
- Prepare a three-component mystery mixture.
- Pretest each separation step.
- Prepare evaporation evidence in advance.
- Keep magnetic filings contained or use larger pieces.
Prior knowledge
- Students know matter has observable and measurable properties.
- Students know dissolving does not mean matter disappears.
- Students can compare before-and-after evidence.
Vocabulary
- mixture
- Two or more substances together without necessarily forming a new substance.
- solution
- A mixture in which one or more substances are dissolved and spread evenly through another substance.
- dissolve
- To spread into another substance so evenly that the dissolved material is no longer visible as separate pieces.
- soluble
- Able to dissolve in a particular liquid under stated conditions.
- insoluble
- Not able to dissolve appreciably in a particular liquid under stated conditions.
- filtration
- A separation method that uses a filter to trap an insoluble solid while a liquid passes through.
- evaporation
- The change of a liquid into a gas; it can leave a dissolved solid behind.
- separate
- To divide a mixture into parts using differences in properties.
Differentiation
- Use method icons and material-property cards.
- Provide a partially completed separation flowchart.
- Allow oral reasoning before written explanation.
- For extension, ask students to design two different valid separation sequences and compare advantages.
Assessment
- Check mixture-versus-solution classification.
- Check method-property matching.
- Check multi-step separation reasoning.
- Require a careful new-substance claim based on evidence.
Exit ticket
Name one mixture, one separation method, and the property that makes the method useful.
Extension
Design a separation plan for a new teacher-provided mixture and explain which step is most uncertain.