1. Types of Mixtures
The saga continues….

2. Mixtures
Combination of more than one pure substance but not bonded chemically
Can be separated physically or chemically!
Salads, Kool-Aid, Pizza.

3. Types of Mixtures: Homogeneous
“Homogeneous” means: appears the same throughout.
Kool Aid contains water, sugar & coloring, but is not a pure substance because each of the ingredients can vary each time it is made. It is a homogeneous mixture because it is the same throughout and can be separated!
We say they are “miscible” (they dissolve completely).

4. Types of Mixtures: Heterogeneous
“Heterogeneous” Mixture: Mixtures in which differences can be seen easily…oil & water, sand & water, flour & water.

5. Mixtures also come in Different Forms
There are THREE Forms of mixtures:
Solutions
Suspensions
Colloids

6. Solutions
A solution is a mixture that appears to be a single substance, but it is actually composed of 2 or more substances that are distributed evenly amongst each other.
SOLUTIONS ARE HOMOGENEOUS
carbon dioxide is
dissolved in water
sugar & Kool-Aid powder are dissolved in water
salt is dissolved in water

7. Suspensions
A suspension is a mixture in which particles of a material are dispersed throughout a liquid or gas, but are large enough that they settle out.
SUSPENSIONS ARE HETEROGENEOUS
Snow globe
muddy water
Italian dressing

8. Colloids
A colloid is a mixture in which the particles are dispersed throughout but are not heavy enough to settle out.
COLLOIDS ARE HOMOGENEOUS
Colloids have properties of both solutions & suspensions.
milk
mayonnaise

9. Separating Mixtures
Substances in a mixture are physically combined, so processes bases on differences in physical properties are used to separate component
Numerous techniques have been developed to separate mixtures to study components

10. Filtration
Sieving
Dissolving
Centrifuging
Evaporating
Distillation
Magnet

11. Filtration
Used to separate heterogeneous mixtures composed of solids and liquids
Uses a porous barrier to separate the solid from the liquid
Liquid passes through leaving the solid in the filter paper

12. Sieving
a porous material is used to separate particles of different sizes.
method is most commonly used to effect gross separations, as of liquids from suspended crystals or other solids.

13. Dissolving
Used to separate two solids when one is soluble in water and the other is not
Put the solids in a solvent(water) and then use a filter to separate the insoluable solid

14. Evaporation
Evaporation can be used to separate a solute from the solvent in a solution
Review the terms; solution, solute and solvent.

15. Distillation Used to separate homogeneous mixtures
Based on differences in boiling points of substances involved

16. Centrifuges rotate containers of
liquids to separate suspended
materials with different densities.
Centrifuges separate different components of human blood or milk and to clarify solutions. A high speed separator can rotate at great speed to separate fat (cream) from milk.
The spin drier in washing machines is a type of centrifuge that throws out the liquid by the "centrifugal force" of the rotation.

17. A magnet
Can be used to separate a magnetic substance from a non-magnetic substance
Magnets are used in the re-cycling industry to separate ferrous and non ferrous metals.

18. What is it?
Cheerios

19. Homogeneous

20. What is it?
Trail Mix

21. Heterogeneous

22. What is it?
Kool - Aid

23. Homogeneous

24. What is it?
Italian Salad Dressing

25. Heterogeneous

26. Try these………..
Raisin Bran

27. Orange Juice

28. Air

29. Cake Batter