1. Reversible and Irreversible
changes
What is an reversible
change
A reversible change is,
1.
something that can be
reversed e.g., water
freezers, then it melts
it turns to gas and then
when it touches a cold
surface it turns back

2. to water
What is a irreversible
change.
A irreversible change
1.
starts off with one
material and ends up
into a new one.
These materials or
1.
food cannot be
reversed.
Wood burns to ash
1.

3. Bread goes off
1.
Physical Changes
Some changes are
1.
physical changes
The materials don’t
1.
break down, change
how they look and feel.
They make a temporary
1.

4. change so it is
reversible.
Chemical Changes
Some changes are
1.
chemical changes.
In a chemical change
1.
the material breaks
down into some thing

5. completely new.
A chemical change is
1.
permanent change so it
is irreversible.
Cooking Food
Cooking food is an
1.
irreversible change.
You can’t get the
1.

6. ingredients of a cake
once you have cooked
it.
This is an irreversible
1.
change
Examples:
Irreversible changes Reversible changes

7. Baking Dissolving
Mixing chemicals Opening and closing doors
Frying Turning on and off lights
Burning Rechargeable batteries
Smashing a window Flat tyre
Drinking a drink Boiling a kettle
Go bald Washing clothes