How can you tell whether a change is a chemical change?
If you think you are unfamiliar with chemical changes, think again.
A common physical change occurs when matter changes from one phase to another. When an ice cube melts for example, it becomes liquid water. The solid ice and liquid water have the same composition. The only difference is the form.
Color Changes
As in the case of autumn leaves, a change in color is a clue to indicate a chemical change.
Perhaps you have found a half eaten apple that turns brown. The reason is that a chemical change has occurs when food spoils.
You have just witnessed a spectacular chemical change if you have seen the leaves change color in the autumn.
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