Question

1. drew added yeast and sugar to room temperature water and placed it in a flask. he stretched a balloon over the opening of the flask. after several minutes, he noticed small bubbles rising along the side of the flask as the balloon slowly began to inflate. which of the following best explains the relationship between the mass before and after the reaction?the mass of the flask/balloon after the reaction should be less than before the reaction since a gas was created.the mass of the flask/balloon after the reaction should be the same as before the reaction since matter is neither created nor destroyed.the mass of the flask/balloon after the reaction should be less than before the reaction because the reactants are used up during the chemical reaction.the mass of the flask/balloon after the reaction would weigh more than before the reaction since something new was created.

Explanation:

This is based on the law of conservation of mass, which states that matter cannot be created or destroyed in a closed system. The flask with the sealed balloon is a closed system—all the matter (including the gas produced that inflates the balloon) is contained inside, so the total mass remains unchanged.

Answer:

B. The mass of the flask/balloon after the reaction should be the same as before the reaction since matter is neither created nor destroyed.