A student balances the reaction: 2H2 + O2 → 2H2O...

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

Question Number 5

A student balances the reaction: 2H2 + O2 → 2H2O. Why must two water molecules appear on the product side?

So oxygen atoms are destroyed to make water. So the molecules stay the same size. So the number of hydrogen and oxygen atoms matches on both sides. So the reaction produces more mass than it starts with.

✔ Correct Answer:

So the number of hydrogen and oxygen atoms matches on both sides.

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

Question Number 5

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