Middle School Physical Science Quiz
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MATTER AND ITS INTERACTIONS
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Two substances are shown as particle models.
Substance A: oxygen gas, O₂. Each molecule has 2 oxygen atoms bonded together. (O = red)
Substance B: water, H₂O. Each molecule has 2 hydrogen atoms and 1 oxygen atom. (H = white, O = red)
Which substance is a pure element (made of only one type of atom)?
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