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Preview questions
1. What is the smallest unit of an element that retains its identity in a chemical reaction?
Molecule · Atom · Compound · Ion
2. Which of the following represents a molecule?
He · Na · H2O · Fe
3. What is the molecular mass of water (H2O)?
16 g/mol · 18 g/mol · 20 g/mol · 14 g/mol
4. Which of the following is a diatomic molecule?
Oxygen · Carbon Dioxide · Glucose · Sodium Chloride
5. The atomic mass of an element is approximately equal to the sum of the masses of its:
Electrons · Protons and Neutrons · Neutrons only · Ions
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