The production of bubbles can indicate a chemical change, but it isn't always definitive. Bubbles often occur when a gas is produced during a chemical reaction, which is a sign of a chemical change. For example, when vinegar (acetic acid) reacts with baking soda (sodium bicarbonate), bubbles of carbon dioxide gas are released, indicating a chemical change.
However, bubbles can also be produced in physical changes, such as boiling water, where liquid water turns into water vapor but no new substances are formed.
In summary, while bubbles can be a sign of a chemical change, they are not exclusively indicative of one. Additional evidence and context are needed to confirm whether a chemical change has occurred.
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