Separation of mixtures and changes

1. MATTER
- Methods to
separate
mixtures
- Physical and
chemical
changes
Natural Science
6th of Primary

2. REVISION

3. PURE SUBSTANCE
 A pure substance is formed only by one
substance.
Example: water, salt

4. MIXTURES
 A mixture is something formed by two or more
substances
 There are two kinds of mixtures
 HOMOGENEOUS MIXTURES
 HETEROGENEOUS MIXTURES

5. HOMOGENEOUS MIXTURE
 In this kind of mixture, you can’t distinguish
the components
 Examples:
Puree Coffee Milkshake
Chocolate Cold tomato soup Orange juice

6. HETEROGENEOUS
MIXTURE
 In this kind of mixture, you can distinguish all
the components
 Examples:
Salad Fruit salad
Paella
Milk and cereals Chickpeas

7. METHODS TO SEPARATE
MIXTURES
There are 4 methods
EVAPORATION
FILTRATION
DECANTING
DISTILLATION

8. EVAPORATION
 This method is to separate a homogeneous
mixture made by a
 SOLID
 LIQUID

9. FILTRATION
 This method is to separate a heterogeneous
mixture made by a
 SOLID
 LIQUID
 Example: water and sand

10. DECANTING
 This method is to separate heterogeneous
mixtures made by two LIQUIDS with different
density
 Example: water and oil

11. DISTILLATION
 This method is to separate a homogeneous
mixture made by two LIQUIDS
 Example – water and alcohol

12. PHYSICAL AND CHEMICAL
CHANGES
 Physical changes: the matter only changes
its aspect
- Example: ice-water-vapour; a paper that I cut;
etc.
 Chemical changes: when the matter
transforms in a different substance
- Example: fire – ashes; iron - oxidation

13. QUESTIONS
 What kind of method is made to separate two
liquids with different density?
 What kind of method is made to separate a
solid and a liquid such as water and sand?
 What kind of change is the fermentation of the
bread?
 What kind of change is the transformation of
the water in ice?

14. ACTIVITIES
1. Make a picture of the 4 methods of
separation of mixtures.
2. Write three examples of physical changes
and three of chemical changes.

15. JOURNAL
 Write three sentences about today’s class.