NS3: MATTER, MATTERIALS AND MIXTURES

 

Unit 7: matter, materials and mixtures

      7.1 Physical changes.

      7.2 Chemical changes.

      7.3 Mixtures.

      7.4 Where do materials come from?

7.1 Physical changes.

- Matter has properties such as shape, size and state.

- It has got three states: solid, liquid and gas.

- Matter can also change of shape. We can bend, press or stretch. Example: when we play with the plasticine.

 

Ø     Activity. Answer the following questions:

1-           Which are the  properties of matter?

They are shape, size and state.

 

2.- Which are the three states of matter?

They are liquid, solid and gas.

 

3.- How can be produced the change of shape?

We can bend, press and strech.

 

7.2 Chemical changes.

 

-There are chemical changes with water, air and other elements.

- The most important chemical changes are:

·     Combustion.- Matter is burned.

·     Oxidaxion.- The metal reacts with water and air.

 

Ø     Activity.Answer the following questions:

 

1.- How  a chemical change is produced

Matter reacts with air, water and other elements.

 

2.- Write the chemichal change

a) The metal reacts with water and air……OXIDATION…………………

b)  Matter is burned…….COMBUSTION

7.3 Mixtures

-A mixture is something that contains two or more different materials.

- Examples: salad, soup, creams.

- The methods to separate mixtures are: filtration and evaporation.

 

Ø     Activity. Answer the following questions:

 

1.- Definition of mixture

A mixture is something that contains two or more different materials.

 

2.- True or False

- Filtration is a method.     TRUE.

- Salad is not a mixture       FALSE

- A soup is a mixture           TRUE

3.- Read and circle the correct answer.

 

a)      Chemical changes /  Physical changes are when substances change into different substances.
b)      Contraction / Combustion is a physical change.
c)      Matter / A mixture is when two or more substances are mixed together.

  

7.4 Where do materials come from? 

-We can classify materials in two types:

Ø     Natural materials.-They are from living things. Examples:

·     From plants.- Wood ( madera)

·     From animals.- wool ( lana).

·     From the ground.- iron ( hierro)

 

Ø     Manufactured materials.- They are made by men. Example: steel.

·     From wood.- table, paper.

·     From wool.- clothes.

 

Ø     Activity. Answer the following questions:

 

1.- List the two types of materials.

They can be natural materials and magnufactured materials.

 

2.- Draw

Natural material

Magnufactured material