A liquid that bursts into flames indicates a chemical change. When a substance ignites and burns, it undergoes a chemical reaction that typically transforms it into new substances (e.g., carbon dioxide and water).
In contrast:
- A tobacco leaf drying is primarily a physical change, as it involves the removal of moisture but does not alter the chemical composition of the leaf.
- A gallium metal melting is also a physical change, as melting is a change of state from solid to liquid without altering the chemical composition of the gallium.
Therefore, the liquid that bursts into flames is the best example of a chemical change.
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