Physical and Chemical Changes

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.
Thanks for watching physical and chemical changes,, MooMooMath and Science uploads a new Math and Science video everyday.

Updated video Physical and Chemical Changes

More on Physical and Chemical Changes

Physical and Chemical Properties

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[koreenklassen]

Color change can be a strong indicator that a chemical change has occurred (ex. apples turning brown, rusting), but seeing the colors of the rainbow is definitely NOT a chemical change...

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[jenesisjaquez]

If you didn’t understand, here is what he is trying to explain:

Physical changes
Example: you have a flower and you take one of its pedals off, this means it changed but it’s still going to be a flower

Chemical changes
Example: liquid

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[bcorbett]

your visual for change in colour is misleading. refracting light in a rainbow is not a chemical change.

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