The following information comes from Ducksters:
What is a solution?
A solution is a specific type of mixture where one substance is dissolved into another. A solution is the same, or uniform, throughout which makes it a homogeneous mixture . Go here to learn more about mixtures.
A solution has certain characteristics:
- It is uniform, or homogeneous, throughout the mixture
- It is stable and doesn’t change over time or settle
- The solute particles are so small they cannot be separated by filtering
- The solute and solvent molecules cannot be distinguished by the naked eye
- It does not scatter a beam of light
Example of a Solution
One example of a solution is salt water which is a mixture of water and salt. You cannot see the salt and the salt and water will stay a solution if left alone.
A solution is a type of homogeneous mixture
A solution is made when one substance called the solute “dissolves” into another substance called the solvent. Dissolving is when the solute breaks up from a larger crystal of molecules into much smaller groups or individual molecules. This break up is caused by coming into contact with the solvent.
In the case of salt water, the water molecules break off salt molecules from the larger crystal lattice. They do this by pulling away the ions and then surrounding the salt molecules. Each salt molecule still exists. It is just now surrounded by water molecules instead of fixed to a crystal of salt.
Now that we know about solutions we need to understand physical and chemical changes. The following information is from ThoughtCo:
In a nutshell, a chemical change produces a new substance, while a physical change does not. A material may change shapes or forms while undergoing a physical change, but no chemical reactions occur and no new compounds are produced.