MSA Grade 8 Science Practice Questions - Montana Science Assessment - Grade 8 Exam

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A student seals 20 g of baking soda and 30 g of vinegar in a zip-top bag. After the reaction, the bag feels cool and the contents have a mass of 50 g. Which claim is best supported by these data?

Mass was created during the reaction because a gas appeared Mass was destroyed because the bag felt cool Mass was conserved because the system was closed and the total mass stayed the same Mass was converted completely into energy, leaving no matter behind

Correct Answer:

Mass was conserved because the system was closed and the total mass stayed the same

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