WVGSA Grade 8 Science Practice Questions - West Virginia General Summative Assessment Grade 8 Science Exam

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A student mixes 50 grams of vinegar and 10 grams of baking soda in a sealed flask on a digital balance. A vigorous bubbling reaction occurs. What will the total mass shown on the balance be after the reaction finishes?

Less than 60 grams because gas bubbles escaped Exactly 60 grams because mass is conserved in a closed system More than 60 grams because new carbon dioxide gas was created 0 grams because liquid turned into gas

Correct Answer:

Exactly 60 grams because mass is conserved in a closed system

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