2. Which of these is a pure substance?
Blood Ocean Brass Wine Table Salt (NaCl)
3. Convert 23mmHg to atm.
0.03026 0.303 0.030 None of these All of these
4. Which of these can an element have a different number of?
Protons Neutrons Electrons All of these None of these
5. 26 + 2.001 =
28.0 28.00 28.001 28 All of these
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