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Physical and Chemical Properties - Doris
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Did you know that this fire burning is an example of a chemical change?
No! How is that a chemical change?
Well when the fire burns the wood, the wood changes into a new substance. The wood turns into ash which is a new substance, and can't be turned back into wood.
Then what's an example of a physical change?
When you melt an ice cube, it turns into water. That water can be turned back into ice, so it's a physical change.
A chemical property is observed only after a chemical change occurs
A physical property is observed without changing the identity of the material
If you toast this piece of bread, then you made a chemical change.
The bread would then be burnt and you wouldn't be able to unburn it.
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