SOLUBLE OR INSOLUBLE?
Y5 investigated whether certain solids were soluble or insoluble in water. The solids under investigation were:- salt, sand, sugar, coffee, rice, gravy granules and flour. Which of these solids are soluble?
Soluble – materials that will dissolve into a liquid.
Insoluble – materials that will not dissolve into a liquid.
DISSOLVING OR MELTING?
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 requires pupils to be taught that some materials will dissolve in a liquid to form a solution, and describe how to recover a substance from a solution.
Y5 carried out some investigations.
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What does soluble mean? What does insoluble mean? Can you list three differences between dissolving and melting? Can you name two solids that can dissolve in a liquid and two solids that melt?
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Hope you have enjoyed learning with us today.