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Physical and chemical changes in matter

Matter can change in state, in shape, in position and in texture. This is what we are going to study today. PAY ATTENTION!!

INTRODUCTION

Physical changes

Chemical changes

Changes in matter

FOLLOW THESE STEPS

Step 4: video + activities

Step 3: Chemical changes

PLANNING

Step 2: Physical changes

Step 1: Read pages 86 and 87

Step 1: reading

Please, open your book on page 86 and 87 and read them. Read the two sections: physical changes on page 86 and chemical changes on page 87.

READING

PHYSICAL CHANGES

In physical changes of matter, the appearance of the matter changes, but not its nature. Physical changes can be REVERSIBLE or IRREVERSIBLE. - REVERSIBLE CHANGES: can be undone or irreversible. - IRREVERSIBLE CHANGES: are permanent and cannot be undone

PHYSICAL CHANGE

En los cambios físicos, cambia la apariencia de la materia, pero no su naturaleza o sus propiedades

PHYSICAL CHANGES: Reversible changes

They can be undone (pueden deshacerse)

PHYSICAL CHANGE

Melted chocolate can be solid again by cooling it

To make an origami figure, you make many folds in a piece of paper. The material has a different shape, but it is still paper and has the same properties

We can freeze orange juice into ice lollies. The ice lollies can be changed back into a liquid by heating them

PHYSICAL CHANGES: Irreversible changes

They are permanent. They cannot be undone (Son permanentes, no pueden deshacerse)

PHYSICAL CHANGE

If we cut bread, we cannot put the slices back into a loaf

Sharpening a pencil is irreversible because you cannot put the pencil shavings back onto the pencil

If we break a glass, we cannot put the pieces back together

CHEMICAL CHANGES

Chemical reactions change the PROPERTIES of the original substance, and a new substance is created. For example, when wood, it is transformed into other substances. These new substances include ashes and smoke and have different properties from the original wood. Three of the most important changes are: OXIDATION, COMBUSTION and FERMENTATION

Chemical Changes

En las reacciones o cambios físicos , la materia cambia de propiedades y se convierte en una nueva sustancia. Por ejemplo, cuando quemamos madera, se crean otras sustancias como ceniza o humo.

Oxidation

Combustion

Chemical Changes

Oxidation takes place when certain substances react with the oxygen in the air and they change into other substances. For example, when apple combines with oxygen, it oxides and turns brown

Combustion produces LIGHT and HEAT. Combustion happens when oxygen in the air reacts with a fuel. For example, during wood combustion, fuel turns into heat, ash and smoke

Fermentation

Chemical changes

Fermentation takes place when certain substances change into other substances because of the action of microbes. For example, we make yoghurt, cheese... by fermenting milk

Physical and chemical chenges

ACTIVITY 1

Watch the video and test yourself in the following link. (Métete en el link. Primero puedes ver el vídeo y por último realiza el test)

ACTIVITIES

ACTIVITY 2

Now it is time to do the worksheet. You have got the worksheet in this link. (Como siempre haz la tarea y después podrás corregir).

ACTIVITIES

CONTACT

THE END

marina.sanchez7@murciaeduca.es