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When baking soda and vinegar react, the surface bubbles. What does this most likely indicate?

a chemical change, because a precipitate is being formed
a chemical change, because a gas is being formed
a non-chemical change, because a precipitate is being formed
a non-chemical change, because a gas is being formed

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a chemical change, because a gas is being formed

The bubbles are CO2 gas produced when acetic acid reacts with sodium bicarbonate—a sign of a chemical reaction, not a precipitate.