Question

physical and chemical changes - 7.6c
2 carlos added vinegar to a flask of baking soda during science class. bubbles of carbon dioxide gas formed as the vinegar and baking soda mixed together. he put a balloon on top of the flask to catch the gas.
which of these caused a chemical change to occur?
a vinegar and baking soda mixing together
b carbon dioxide inflating the balloon

Explanation:

A chemical change results in the formation of new substances. When vinegar (acetic acid) and baking - soda (sodium bicarbonate) mix, they react to form carbon dioxide gas, water, and a salt (sodium acetate). This is a chemical reaction. Carbon dioxide inflating the balloon is a physical change as it just involves a change in volume and state of the gas, not the formation of a new substance.

Answer:

A. Vinegar and baking soda mixing together