OSTP Science Grade 8 Practice Questions - Oklahoma School Testing Program - Science, Grade 8 Exam

Question 5

What reading will the digital balance show after the chemical reaction completes?

150 g, because the total number and types of atoms are conserved in a closed system during a chemical reaction. 120 g, because gas escaping into the air reduces the mass of the closed flask. 180 g, because new gas molecules add extra weight to the system. 0 g, because chemical energy destroys mass during reaction.

Correct Answer:

150 g, because the total number and types of atoms are conserved in a closed system during a chemical reaction.

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