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Separating Mixtures
Solutions
Reversible and Irreversible Changes
Vocabulary
Scientific Method
100
What is a way to separate a mixture of solids?
sieves, air, water, magnets
100
What is a solution?
A mixture where the solute is dissolved into a solvent
100
What change is ice melting into water an example of?
A reversible change
100
What is a solute?
The substance that is being dissolved
100

What is a hypothesis?

An educated guess

200
How can you separate nails from gumballs?
Using a magnet
200
Is a mixture of lemon juice and water a solution?
yes
200
Is adding blue food colouring to water so it turns blue and example of a reversible or irreversible change?
Reversible because you can separate the food colouring because the new colour is not a new product.
200
What is a solvent?
The substance doing the dissolving
200

What do you call the variable that you change in an experiment?

manipulated variable

300

Explain evaporation

A separation technique where the liquid part of the solution changes into a gas and the solid that has been dissolved is recovered.

300
Is cold water or hot water better for dissolving solutes?
hot water
300
Is Diet Coke and Mentos and example of an irreversible change?
Yes, because there are bubbles formed
300
What is a saturated solution?
A solution that cannot hold anymore solute
300

How many variables can you change when performing a fair test?

one

400
If you have a solution of sugar and water, how can you separate the dissolved sugar form the water?
By using evaporation.
400
What makes carbon dioxide?
Vinegar and baking soda
400
How do you know an irreversible change has happened?
There is a new substance formed, there is a colour change, there are bubbles or energy is released.
400
What is cohesion?
How well the particles in a substance are attracted to each other
400

What do you call the variable that changes in your experiment that you wish to measure or observe?

responding variable

500
How do you separate paper, large rocks and staples.
You can use a magnet to separate the staples and air or water separation to separate the rocks and paper.
500
Is salad dressing a solution?
no.
500
A gas fireplace is turned on and then turned off. Is this an example of an irreversible or reversible change?
An irreversible change because there is a change in colour and energy is released.
500
What is a chemical reaction?
A reaction between two substances that creates a new substance.
500

What you learned from your experiment?

conclusion