KS3 Y7 Physical and Chemical Changes

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7Fa Physical and Chemical Changes

There are types of .

First we look at an example of change.

When water is heated it turns into which is water in the form. This is also called the state.

When liquid water is it turns into which is still water but in the state.

water or can easily be by heating and the original water produced.

steam can also be into water.

Such changes where is produced and the changes are are called changes.

Secondly we look at an example of a change.

When a slice of bread is placed in a toaster we get a slice of bread. The burnt bits cannot be changed back into the original bread. This is a .

Burning a piece of wood will leave behind ashes on the ground. The ash be changed back into the original wood.

These are examples of . changes occur when a has taken place.

We can tell if a has taken place by looking out for some .

There are of them and they are.

A change of may be observed, a may be given off and a can be detected, for example when some chemicals are added together it gets .

reactions produce substances and the change is . You cannot get back the chemicals.

 

 

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