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Chemistry 8 Online
OpenStudy (anonymous):

please help 2. Which of these chemical formulas NaCl, O2, He, or SO2 represents both an element and a molecule? NaCl O2 He SO2 4. Which subatomic particles have approximately the same mass? protons and electrons neutrons and electrons protons and neutrons electrons and atoms 13. Which of the following represents an incorrectly balanced chemical equation? (Points : 5) Na2CO3 (s) Na2O (s) + CO2 (g) Zn (s) + 2HCl (aq) ZnCl2 (aq) + H2 (g) 2ZnS (s) + 2HCl (aq) 4ZnCl2 (aq) + H2S (g) 4Al (s) + 3O2 (g) 2Al2O3 (s)

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