Question

1. a student places baking soda into a flask and adds vinegar. the mixture immediately begins to bubble, releasing a gas. the student places a balloon over the flask to capture the gas. which statement best explains why this is a chemical change? the vinegar becomes diluted, but no new substance is formed. the bubbling shows that a gas, a new substance, is being formed. the baking soda disappears into the vinegar, showing it is dissolving. the gas is evidence of heat being absorbed but no new substance is formed.

Explanation:

A chemical change is characterized by the formation of a new substance. When baking soda and vinegar react, the bubbling indicates the production of carbon - dioxide gas, a new substance. Dissolving is a physical change, and if no new substance is formed, it's not a chemical change. Heat absorption alone without new substance formation doesn't signify a chemical change.

Answer:

The bubbling shows that a gas, a new substance, is being formed.