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1. Which of these is a pure substance?
Blood Ocean Brass Wine Table Salt (NaCl)

2. How many protons in sodium-23?
11 12 23 1 0

3. Which of these has a negative charge?
Protons Neutrons Electrons Quarks None of these

4. Convert 23mmHg to atm.
0.03026 0.303 0.030 None of these All of these

5. 26 + 2.001 =
28.0 28.00 28.001 28 All of these

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