1. PURE SUBSTANCES AND MIXTURES

2. INTRODUCTION Hello, today I´m going to talk about:
What are pure substances.
What is a mixture.
The elements of the mixtures that are HETEROGENEOUS and HOMOGENEOUS.
Components of a mixture: Magnetism, Filtration, Decantation and Evaporation.
Questions and answers

3. WHAT ARE PURE SUBSTANCES?
A pure substance is a substance that cannot be separated by physical means. Some examples of pure substances are water, gold, glucose, carbon dioxide, oxygen and hydrogen.

4. WHAT IS A MIXTURE?
A mixture is made when two or more substances are combined, but they are not combined chemically.  General properties of a mixture:
The components of a mixture can be easily separated
The components each keep their original properties
The proportion of the components is variable

5. GROUPS OF MIXTURE
There are two main categories of mixtures: homogeneous mixtures and heterogeneous mixtures.
Then you can see a small diagram of heterogeneous and homogeneous.

6. HETEROGENEOUS MIXTURE
A heterogeneous mixture is one that consists of two or more substances. It is non-uniform and the different components of the mixture can be seen. Some examples of heterogeneous mixtures are: cereals with milk and a salad.

7. HOMOGENEOUS MIXTURE
A homogeneous mixture is one that is uniform, where the different components of the mixture cannot be seen and they have specific properties. . Some examples of homogeneous mixture are: air and solution of salt.

8. MAGNETISM
Magnets are objects that produce an area of magnetic force called a magnetic field.
Magnetic fields by themselves are invisible to the human eye. Magnets only attract certain types of metals, other materials such as glass, plastic and wood aren't attracted. .

9. FILTRATION
Filtration is the separation of solid particles in a mixture by passing the mixture through a screen that prevents the big parts from going through while allowing the little particles to go through. You can think of a liquid as very very small particles.

10. DECANTATION
Decantation is a process used to separate a mixture. It usually involves removing the liquid portion of a substance while leaving behind the sediment. Some examples of decantation are: oil and water and red wine.

11. EVAPORATION
Evaporation is the vaporization of a liquid, where a liquid become a vapor. It is the reverse of condensation and allows a liquid to change form to a gas. Some examples of evaporation are: salt and water and water turns to humidity air.

12. QUESTIONS AND ANSWERS WHAT IS A MIXTURE?
A mixture is made when two or more substances are combined, but they are not combined chemically
WHAT IS A FILTRATION?
Filtration is the separation of solid particles in a mixture by passing the mixture through a screen that prevents the big parts from going through while allowing the little particles to go through.