MATTER is made up of one or more substances which, in turn, consist of tiny particles, called atoms.

There are two types of matter:

          - PURE SUBSTANCES: they only contain one type of component which can't be separated.

          - MIXTURES: they contain two or more pure substances.

SEPARATION OF MIXTURES

We can distinguish four methods:

Evaporation:

Distillation:

 

Decantation:

Let's watch a video about TYPES OF MIXTURES:

 CHANGES OF STATE

 CHEMICAL CHANGES

Pay attention to this nice explanation about CHEMICAL CHANGES. You will learn and find lots of examples. But you will need to use all your senses on it, the girl speaks quite fast!

 Would you like to watch some amazing chemical reactions?

 

Everything, including you, has energy. The energy inside your body is chemical energy. Most of it is transformed permanently into heat energy and movement (motion).

Click here if you want to know the amount of calories you need to consume to stay healthy... and alive! 

 

 If you want to learn new things about energy click on the image

 

RENEWABLE ENERGY : It´s generated from natural resources such as water (hydropower), wind , sunlight (solar), organic material(biomass)... 

The transmission of heat is different depending on the materials involved. Look at the next graphic and watch the video.

These videos show how nuclear power stations work

The nuclear power is apparently clean and cheap. The problem comes when there is an accident. Look at what happened in Fukushima because of the tsunami.

 

Click here to know how hydroelectrical energy is obtained

Remember that energy can be dangerous for the environment,

global warming

or the  greenhouse effect

 

are new troubles that affect our world.

 

 

But there are always things that we can do 

Let´s debate! Here you are the list of advantages and disadvantages of different energy sources:

Coal and petroleum

Nuclear energy

Solar energy

Biomass and biofuels

HydroelectricaL energy

Eolic energy