Lesson: Chapter 16 — Changes of Matter

16.2. Chemical equations 8 of 8 Reset answers

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Question 8

What is the balanced equation for sodium reacting with water to form sodium hydroxide and hydrogen gas?

A Na + H₂O → NaOH + H₂ B 2Na + 2H₂O → 2NaOH + H₂ C Na + 2H₂O → NaOH₂ + H₂ D 2Na + H₂O → 2NaOH + H₂

The right answer is the one marked above.

2Na + 2H₂O → 2NaOH + H₂. Both sides have two Na, two O and four H.

NaOH₂ is not a real formula — changing a formula to balance is always wrong. In 2Na + H₂O → 2NaOH + H₂ the hydrogens do not match.

Answer the question to continue.