1. The separation technique shown is filtration.
- It would be used to separate a mixture of sand and water because sand is insoluble in water and can be trapped by the filter paper while the water passes through.
2. The technique shown is distillation.
- It would not be effective for separating salt and water because both substances are soluble and form a homogeneous mixture; distillation requires a difference in boiling points, which isn’t applicable here for separation by this method alone.
3.
- Pure substance: H₂O
- Mixture: Salt water
- Element: O₂
- Compound: CO₂
4. A compound is a substance formed when two or more different elements are chemically bonded together. They cannot be separated by physical means because the atoms are chemically combined.
Parent Tip: Review the logic above to help your child master the concept of chemistry unit 4 worksheet 2 answers.
