Separating Mixtures
Solutions
Reversible and Irreversible Changes
Vocabulary
Other
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 more dense, water or vegetable oil?

Dish soap is more dense

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

Name the states of matter.

solid, liquid, gas

300
Explain decanting
A separation technique where part of the mixture is poured out and the other part remains in the original container.
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

Which of the following substances will NOT make a crystal? Salt, Alum, Sugar, or Baking Powder

Baking Powder

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 are two ways to create carbon dioxide?

Vinegar and baking soda, Alka Seltzer in water, Burning fossil fuels

400

Name two ways 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 (heat, light)

400

What is pH paper used for?

Testing the acidity of water based liquids.

400

If liquids layer, where will the most dense liquids be?

At the bottom.

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 a salad dressing of vinegar and oil 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

Mr. Hill has a two sided scale with a paper bag on each side. One bag is open. The other bag is closed and contains CO2. What will Mr. Hill observe the scale doing?

Mr. Hill will observe that the CO2 side of the scale is dropping because CO2 is heavier than air.

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