OSAS Science Grade 8 Practice Questions - Oregon Statewide Assessment System - Science, Grade 8 Exam

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In a sealed, airtight flask, a student mixes 20 g of baking soda with 50 g of vinegar. Bubbles form and the mixture fizzes. After the reaction stops, the student measures the total mass of everything inside the sealed flask. What should the total mass be?

Less than 70 g, because the gas bubbles escaped Exactly 70 g, because the flask is sealed and mass is conserved More than 70 g, because chemical reactions create new mass Zero, because everything turned into gas

Correct Answer:

Exactly 70 g, because the flask is sealed and mass is conserved

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