Chemical and Physical changes

Tuakana Chemical and physical changes 06/11/2017

What are physical changes ?

This is changes when you are able to reverse what has been done.

Example:

As you can see there is water inside a cup and ice on the other side. This is basically a physical change because when you freeze water it turns into ice and when you unfreeze ice it turns back into water, that is how you know that it is a physical change.

Facts about physical changes ?

• It is reversible
• The changes are only physical
• This does not need light or fire in this

What are chemical changes ?

Chemical changes is when it is not reversible

Example:

As you can see there is a paper getting burnt. Apparently when a paper is burnt it turns into ash and that is it, because it cannot go back into paper then you know it is a chemical change.

Facts about chemical changes ?

• It isn’t reversible
• This produces light, smoke, gas and so on
• There are usually one or more new substances formed or created from that change
• Chemical changes happen everyday
• There are different kinds of chemical changes