A chemical change is characterized by the following:
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A new substance is created. (This is a defining feature of a chemical change.)
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It is a permanent change. (Chemical changes usually result in substances that are different from the original and cannot easily revert back to the original state.)
The other two options do not describe chemical changes:
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It can be a physical change. (This describes a physical change, not a chemical change.)
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A phase change is occurring. (This describes a physical change, such as changes between solid, liquid, and gas states, not a chemical change.)
So, the correct answers are:
- A new substance is created.
- It is a permanent change.