CAST Grade 8 Practice Questions - California Science Test (CAST) - Grade 8 Exam

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Baking soda and vinegar react in a sealed, flexible container and produce a gas. If no mass escapes, how does the total mass after the reaction compare with the mass before?

It is the same because mass is conserved in a closed system It must double because a gas formed It must become zero because reactants are used up It decreases automatically whenever temperature rises

Correct Answer:

It is the same because mass is conserved in a closed system

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