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16 October, 05:11

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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Answers (1)
  1. 16 October, 05:36
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    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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