Question

part b add 2 teaspoons of baking soda and 2 teaspoons of citric acid to the foam cup. add the half cup of water to the cup and stir. is a chemical reaction taking place? how do you know?

Explanation:

Baking soda (sodium bicarbonate) reacts with citric acid to form carbon - dioxide gas, water, and a salt. The formation of gas bubbles (effervescence) is an indication of a chemical reaction.

Answer:

Yes, a chemical reaction is taking place. We know this because when baking soda and citric acid are mixed in water, effervescence (bubbling) occurs, which is a sign that a new substance (carbon - dioxide gas) is being formed.