If the answer to either of the first two questions is and answers to consequent questions are , it's most likely a physical change. Conversely, if the answer to either of the last two questions is positive, while first two draw a negative, it is certainly a chemical change. The trick is to simply observe clearly and analyze what you see.
In a chemical change, the substances are altered chemically and display different physical and chemical properties after the change. When a chemical change occurs new substance(s) are formed through a reorganization of the atoms. A chemical change is irreversible.
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