RISE Science Grade 8 Practice Questions - RISE Science - Grade 8 Exam

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A student pours 50 mL of vinegar into a flask and adds 10 g of baking soda. She immediately seals the flask with a tight rubber stopper. A gas forms and inflates a balloon attached to the flask. When she measures the total mass of the sealed apparatus before and after the reaction, the mass remains exactly 160 grams. Which principle does this phenomenon demonstrate?

Gas molecules have no mass when produced in a reaction. Total mass is conserved in a closed system during a chemical reaction. Chemical reactions create new matter that replaces the original reactants. Energy is converted into mass when bubbles are generated.

Correct Answer:

Total mass is conserved in a closed system during a chemical reaction.

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