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12-10-2016
Chemistry

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Which of these substances are compounds? How do you know?
A. Salt (NaCl)
B. Nitrogen (N)
C. Helium (He)
D. Water (H2O)

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Аноним Аноним

12-10-2016

Salt because it's a solid and helium and nitrogen are gases.
Water is a liquid because it's form can change.

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