This document discusses mixtures and separation methods. It defines mixtures as being two or more substances mixed together and identifies three main types of mixtures: solutions, suspensions, and colloids. It then describes several common separation methods including evaporation, magnetism, hand separation, filtration, and sifting/sieving. Examples are provided to illustrate each separation method.

1. How are
mixtures
formed and
separated?
Chapter 10: Lesson 2.

2. Ice
Water
Water vapor
Changes in state

3. Butter melting

4. Mixture
2 or more substances mixed
together.

5. Is this a
mixture?
Why?

6. Types of mixture
1) Solutions 2) Suspensions 3) Colloids

7. 1) Solution
When you add salt to water
The salt will completely
dissolve.

8. A solution is:
A mixture where its parts
blend well (even if you look at
them under the microscope)

9. Which of the following is a solution?

10. A solution can be made with:
solids, liquids and gases

11. 2) Suspension
When you add soil to water
The soil will be mixed with the water
but because the solid particles are
big they settle down.

12. Another example:
When you add oil to water
The oil is mixed when you stir.
After a while the oil is separated.

14. SEPARATION METHODS FOR MIXTURES
• EVAPORATION
Separation of a liquid and
a soluble solid.

15. Magnetism
• If one component of the mixture has magnetic
properties, you could use a magnet to
separate the mixture. Iron, nickel, and cobalt
are all materials that are magnetic.
• Not all metals are magnetic: gold, silver, and
aluminum are examples of metals that are not
magnetic.

16. Example of magnetism
• Using a magnet to separate nails from wood
chips.

17. Hand separation
• Separating the parts of a mixture by hand.
• Only useful when the particles are large
enough to be seen clearly.
• Useful for: separating parts of a salad.

18. Example of hand separation:
• Using your fork to separate tomatoes, lettuce,
cucumber, onions, etc. in your salad.

19. Filtration
• Used when separating a solid substance from
a fluid (a liquid or a gas) by passing a mixture
through a porous material such as a type of
filter.
• Works by letting the fluid pass through but
not the solid.
• Examples of filters: coffee filter, cloth, oil
filter, even sand!

20. Example of filtration:
• Using a coffee filter to separate the coffee
flavor from the coffee beans.

21. Sifting or sieving
• Used to separate a dry
mixture which contains
substances of different
sizes by passing it through
a sieve, a device containing
tiny holes.

22. Example of sifting/sieving:
• Using a sieve
to separate
sand from
pebbles.