Alaska Science Grade 8 Practice Questions - Alaska Science Assessment, Grade 8 Exam

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In a sealed jar, baking soda and vinegar react to form new substances. The total mass of the jar and its contents is measured before and after the reaction. What should the measurement show?

The total mass doubles because two substances react. The total mass stays the same because atoms are rearranged, not created or destroyed. The total mass increases because gas is produced. The total mass decreases because the solid baking soda disappears.

Correct Answer:

The total mass stays the same because atoms are rearranged, not created or destroyed.

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