This presentation defines mixtures and solutions, and describes different types of mixtures. A mixture is a combination of substances that retain their individual properties and can be separated using physical means. Mixtures can be homogeneous, with a uniform composition throughout, or heterogeneous. Common examples provided include salads, cereals, and air. Various separation methods are outlined, including hand picking, magnetic attraction, evaporation, sieving, and filtration. In summary, the key points are the definition of mixtures, examples of homogeneous and heterogeneous mixtures, and different physical separation techniques for mixtures.

1. PRESENTATION OF
MIXTURES & SOLUTIONS
BY KK SHAI

2. Definition of a mixture
 A mixture is a combination of two or more
substances in which the substances retain
their own properties.
 A mixture’s composition can vary.

3.  Mixtures keep their physical properties.
 They can be separated by their physical
properties
 Mixtures do not form new substances

4. Example of mixtures
Salad
 The lettuce and vegetables
do not change but remain the
same even after they have
been mixed.

5. Is cereal a mixture?
Answer:
 Yes, the properties of the
substances do not
change.
 You can still see the
bananas, milk and cereal.

6.  Mixtures can take many forms
 They can be in a form of solids, liquids and
gases.

7. Mixtures of Solids

8. Mixtures of liquids

9. Mixtures of Gases

10. Types of mixtures
Homogenous mixture
 Homogeneous means “the
same”
 A homogeneous mixture is
a mixture with the same
composition throughout.
 It is also called a solution
Heterogeneous mixture
 Heterogeneous means
“different”
 A heterogeneous mixture is a
mixture in which the
composition is not the same
throughout.

11. An example of a homogeneous
mixture
 Coffee
An example of heterogeneous
mixture
 Salad

12. Quick question:
 Is air a homogeneous mixture or
heterogeneous mixture? Justify your
answer.

13. Separating mixtures
 Mixtures can be separated using:
1. Hand picking
2. Magnetics attraction
3. Evaporation
4. Sieving
5. Filtration

14. Hand picking method
 Hand picking can be used to
separate the components of a
solid-solid mixture.
 method is only useful when
the particles are big enough
to be seen.
 For example, separating parts
of a salad.

15. Magnetic attraction Method
 Magnetic attraction is a
process in which magnetically
susceptible material is
extracted from a mixture by
the use of the magnetic force.

16. Evaporation method
 Evaporation is a process in which a liquid changes into a gaseous form on
heating. The liquid evaporate from the mixture, leaving the soluble part
behind.

17. Sieving
 Sieving is used to separate a dry mixture which contains
substances of various sizes by passing it through a sieve

18. Filtration
Filtration is the process whereby
fluids pass through a filter or
filtering medium.
Example: using a
coffee filter to separate
the coffee flavour from
the coffee beans.

19. Any questions?

20. References
 Alcolea, J.M. (2013), Mixtures powerpoint . Available from Slideshare at
https://www.slideshare.net/josemartinezalcolea/mixtures-powerpoint (Accessed on 31
August 2018).
 Kea, J. (2010), mixtures and solutions. Available from Slideshare at
https://www.slideshare.net/jahnkea/mixtures-and-solutions-3798361 (Accessed on 31
August 2018).
 Jho, A.S. (2013), Ways of separating mixtures. Available from Slideshare at
https://www.slideshare.net/flamerock/ways-of-separating-mixtures-26534628
(Accessed on 31 August 2018).
 Heuser, S. (2014), Mixtures and Solutions PPT. Available from Slideshare at
https://www.slideshare.net/sammenheuser/mixtures-solutions-ppt (Accessed on 31
August 2018).
 Toh, J. (2010), Separation of mixtures. Available from Slideshare at
https://www.slideshare.net/joeltoh/separation-of-mixtures (Accessed on 1 September
2018)