Answer:
To determine whether a chemical or physical change is occurring, you could look for several pieces of evidence:
Formation of new substance: If a new substance is formed with different properties than the original substance, then it is likely a chemical change. For example, if a metal rusts, a new substance is formed that is different from the original metal and cannot be reversed by a physical process.
Energy changes: Chemical reactions often involve a release or absorption of energy. If there is a significant energy change, such as a release of heat or light, then it may be a chemical change. Physical changes generally do not involve energy changes.
Change in color, odor, or taste: If there is a change in color, odor, or taste, then it may be a chemical change. For example, when a banana ripens, it changes color and develops a different taste due to chemical reactions.
Formation of a precipitate: A precipitate is a solid that forms when two liquids are mixed. If a precipitate forms, it may indicate a chemical change.
Reversibility: If the change is easily reversible, it is likely a physical change. For example, melting ice can be easily reversed by freezing it again, whereas burning paper cannot be reversed by a physical process.
By looking at these pieces of evidence, you can determine whether a chemical or physical change is occurring.
Step-by-step explanation: