Year 8 – SolutionsDr Pusey

www.puseyscience.com

What is a solution?

• When something dissolves into something else, the whole thing becomes a solution

• If you mix sugar into water, it dissolves. The sugar becomes invisible. It is now a solution.

• Seawater is a mixture of water and salt, it is already a solution you cannot see the salt.

What is a solution?

• Is water a solution?

• Is lemonade a solution?

• Is dishwashing water a solution?

• Is sand in water a solution?

What is a solution?

• Is water a solution? NO

• Is lemonade a solution? YES!

• Is dishwashing water a solution? YES!

• Is sand in water a solution? NO

Solutions contain 2 things

• Solute• It’s usually a solid• There’s less of this in the mixture• Once added, it becomes clear as it dissolves• SALT, SUGAR, ETC

• Solvent• It’s usually a liquid• There’s usually much more of this in the mixture• It dissolves the solute into itself and becomes clear• WATER, KEROSINE, MINERAL TURPINTINE (TURPS)

Name the solvent and solute

Solution Solvent SoluteSalty Water

Sugary Water

Copper Chloride Solution

Carbonated Water

Name the solvent and soluteSolution Solvent Solute

Salty Water Water Salt

Sugary Water Water Sugar

Copper Chloride Solution Water Copper Chloride

Carbonated Water Water Carbon Dioxide

A few more fancy words to learn

• Concentration• The more solute (solid stuff) inside the solution, the higher the

concentration.

• Concentrated• If a solution is strong, we can call it concentrated, because it has

more particles in the solution.

• Dilute• If a solution is weak, we can call it dilute, because it has less

solute particles in the solution.

Last bunch of fancy words to learn

• Soluble• If something dissolves, it is soluble. It’s that simple!

• Insoluble• If something cannot be dissolved, it’s insoluble!

• Saturated• A solution is saturated if no more solute can be dissolved

• Suspension• The solid stuff that shows up in a liquid when it doesn’t dissolve

ExamplesIf I add sugar to water, it will D___________ .

If I keep adding more sugar, the solution will eventually become S___________ where no more sugar will dissolve

If I add sand to the water, it will just stay a solid and sink to the bottom, because sand is I___________ in water

ExamplesIf I add sugar to water, it will Dissolve .

If I keep adding more sugar, the solution will eventually become Saturated where no more sugar will dissolve

If I add sand to the water, it will just stay a solid and sink to the bottom, because sand is Insoluble in water

ExamplesA C__________ acid is more fun to play with than a D_________ acid because it’s stronger and the reactions happen faster!

My coke wasn’t sweet enough so I kept adding sugar (which is the S________ ) until it didn’t D________ any more. At that point, it’s called a S____________ S____________

ExamplesA Concentrated acid is more fun to play with than a Dilute acid because it’s stronger and the reactions happen faster!

My coke wasn’t sweet enough so I kept adding sugar (which is the Solute ) until it didn’t Dissolve any more. At that point, it’s called a Saturated Solution

All done!A good video to watch:

http://www.pearsonplaces.com.au/asset_viewer.aspx?a=2EwU9tgoQ7k%3d

And another (if there’s time!):

http://www.pearsonplaces.com.au/asset_viewer.aspx?a=zoqhORfS7gI%3d