Which two elements make up a molecule of water?

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Prepare for the Earth Science Test on Earth's Waters. Study with interactive flashcards and multiple-choice questions, with hints and detailed explanations. Get ready to excel on your exam!

Multiple Choice

Which two elements make up a molecule of water?

Explanation:
Water is formed from hydrogen and oxygen. In a water molecule, two hydrogen atoms bond with one oxygen atom, giving the chemical formula H2O. This means the molecule is made up of hydrogen and oxygen, not carbon or nitrogen. The other options involve elements that don’t appear in water (carbon or nitrogen), or pairs that don’t produce water (carbon with oxygen forms carbon dioxide). So the two elements that constitute a water molecule are hydrogen and oxygen.

Water is formed from hydrogen and oxygen. In a water molecule, two hydrogen atoms bond with one oxygen atom, giving the chemical formula H2O. This means the molecule is made up of hydrogen and oxygen, not carbon or nitrogen. The other options involve elements that don’t appear in water (carbon or nitrogen), or pairs that don’t produce water (carbon with oxygen forms carbon dioxide). So the two elements that constitute a water molecule are hydrogen and oxygen.

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