SOLUBLE OR INSOLUBLE?
Many people get confused between dissolving and melting, but there are several important differences.
- Dissolving involves a liquid and another material, often a solid.
- Melting only involves a solid
- In dissolving, the solid mixes into the liquid to make a new liquid, called a solution.
- In melting, the solid changes into a liquid that is the same material.
- Dissolving doesn’t need heat to occur.
- Melting needs heat to occur.
The National curriculum require pupils to be taught that some materials will dissolve in liquid to form a solution, and describe how to recover a substance from a solution.
Here Y5 are investigating whether the solids are soluble or insoluble in water. The solids are salt, sand, sugar, coffee, gravy granules and flour. Which of these solids are soluble?
