Kevin's science class did an experiment using baking soda, vinegar, a balloon, and a flask. First, they filled the flask with vinegar and poured baking soda into the deflated balloon. Then, they placed the balloon over the mouth of the flask, being careful not to let the baking soda fall into the vinegar. They observed that the balloon was still deflated. They placed the flask onto a scale and measured the weight to be 565.8 grams.Next, the students held the balloon up and allowed the baking soda to mix with the vinegar. The mixture began to bubble, and the balloon began to inflate.What happens to the weight of the flask as the baking soda and vinegar mix? A. The weight increases because the volume is increasing. B. The weight increases because there is more matter in the flask. C. The weight decreases because gases weigh less than liquids and solids. D. The weight stays the same because weight is always conserved.
Question
Kevin's science class did an experiment using baking soda, vinegar, a balloon, and a flask. First, they filled the flask with vinegar and poured baking soda into the deflated balloon. Then, they placed the balloon over the mouth of the flask, being careful not to let the baking soda fall into the vinegar. They observed that the balloon was still deflated. They placed the flask onto a scale and measured the weight to be 565.8 grams.Next, the students held the balloon up and allowed the baking soda to mix with the vinegar. The mixture began to bubble, and the balloon began to inflate.What happens to the weight of the flask as the baking soda and vinegar mix? A. The weight increases because the volume is increasing. B. The weight increases because there is more matter in the flask. C. The weight decreases because gases weigh less than liquids and solids. D. The weight stays the same because weight is always conserved.
Solution
The correct answer is D. The weight stays the same because weight is always conserved.
Here's why:
The principle of conservation of mass states that mass cannot be created or destroyed in a closed system through ordinary chemical or physical changes. This means that the total mass before a reaction must be the same as the total mass after the reaction.
In this experiment, the flask is a closed system. The baking soda and vinegar react to form carbon dioxide gas, water, and a type of salt. The carbon dioxide gas inflates the balloon, but it doesn't leave the flask, so it's still part of the system's total mass.
Therefore, even though the reaction changes the state of the substances (from solid and liquid to gas) and the volume of the balloon increases, the total weight of the flask doesn't change. It remains at 565.8 grams.
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