Which example shows a new substance being formed?

A classic example of a new substance being formed is the reaction between vinegar (acetic acid) and baking soda (sodium bicarbonate). When these two substances combine, they undergo a chemical reaction that produces carbon dioxide gas, water, and sodium acetate, resulting in the formation of new substances that differ from the original reactants. This is evident by the fizzing and bubbling that occurs during the reaction, indicating the release of gas.