WVGSA Grade 5 Science Practice Questions - West Virginia General Summative Assessment Grade 5 Science Exam

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Two students perform baking soda + vinegar reactions: - Student A conducts the reaction inside a sealed plastic bottle with a balloon stretched tightly over the top. - Student B conducts the reaction in an open glass beaker. Student A measures starting mass = 150.0 g, final mass = 150.0 g. Student B measures starting mass = 150.0 g, final mass = 146.2 g. Why did Student A's system maintain constant mass while Student B's system lost 3.8 grams?

Student A used a closed system that trapped gas particles inside, whereas Student B used an open system that allowed carbon dioxide gas to escape into the air. Student A's chemical reaction did not produce gas, while Student B's reaction produced gas. Student B's beaker destroyed matter during chemical change. The balloon added extra gravitational mass to Student A's bottle.

Correct Answer:

Student A used a closed system that trapped gas particles inside, whereas Student B used an open system that allowed carbon dioxide gas to escape into the air.

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