In this video I would like to talk about physical and chemical changes. Physical changes are changes in appearance only.
A new substance is not created and new chemical bonds are .not formed or broken.
For example, take this stack of paper, and wading it into smaller pieces is a physical change.It still has the same properties as the original paper.
Cutting someone's hair is a physical change.
The hair has the same properties as the original hair.
Phase changes are physical changes.
When ice goes to solid,liquid ,then a gas and back it is a physical change.
Most mixtures are a physical change.
Mixing salt and water is a physical change because you can separate it later.
Chemical changes on the other hand create a new substance.
It involves breaking or making new chemical bonds.
between atoms.
Chemical changes leave behind clues or indicators of a chemical change.
Here are 5 indicators of a chemical change.
First if you see burning or fire it is a chemical change.
A temperature change without heating or cooling is a chemical change.
An explosion is a chemical change. They are also pretty cool.
A change in color is a chemical change.
A change in odor is a chemical change and anytime you have bubbles of fizzing you have a chemical change.
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