The statement which best provides support for the fact that a chemical change has occurred is that many bubbles formed after mixing.
In a chemical change, new substances are formed and there is a recombination of the atoms in reactants as the products are being formed.
There are several cues that indicate that a chemical change has taken place such as;
- Appearance of a solid in an aqueous phase reaction.
- Evolution of gas
- Sudden change in the temperature of the system
- Change in the color of the system
In the particular instance in this question, when baking soda and vinegar were mixed together, a gas was evolved signifying that a chemical change has taken place.
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