Year 7 - Science
Separating pure salt from dirty rock salt
Separation techniques
Study Hub
Study Guides
This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit covers techniques for separating mixtures, including filtration, evaporation, distillation, and chromatography, as well as identifying pure substances. Conduct experiments safely, record observations, evaluate methods, and suggest improvements.
Lesson Summary
You will learn to suggest how to combine separation techniques in order to separate pure salt from a sample of rock salt.
Key Notes
- The properties of the substances in a mixture help to determine the technique best suited to separate them.
- When mixtures contain more than two components, multiple techniques may be needed to separate them.
- Creating a solution of an existing mixture can allow a specific technique to be used for separation.
- Separating salt from rock salt requires: making a solution, filtration, and crystallisation.
Vocabulary To Learn
- separation technique: A process or method used to isolate a substance from a mixture, usually to obtain a pure sample of it.
- property: A property is a feature or characteristic of a substance that can be used to classify it, or describe how it behaves.
- soluble: When a substance dissolves in a liquid it is described as soluble in that liquid.
- insoluble: An insoluble substance is one that will not dissolve in a particular solvent.
Common Mistakes To Avoid
- Filtration alone can separate salt from rock salt - idea that only one technique is needed.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
The properties of the substances in a mixture help to determine the technique best suited to separate them. When mixtures contain more than two components, multiple techniques may be needed to separate them.
2. Define this scientific word and use it in context. 'separation technique'
A process or method used to isolate a substance from a mixture, usually to obtain a pure sample of it. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Filtration alone can separate salt from rock salt - idea that only one technique is needed. Correction: Highlight that each separation technique (so far) creates two products; one of them may still be a mixture that requires further separation.
More Lessons In This Unit
Browse all guides in the Year 7 Science guide library.