1110Samplefinal - Sample Chem 121 Final 1. A metal sample...

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Sample 1 2 1 Final 1 Sample Chem 1 2 1 Final 1. A metal sample weighing 30.9232 grams was added to a graduated cylinder containing 23.20 mL of water. The volume of the water plus the sample was 24.80 mL. What is the density of the metal? a) 19.3 g/mL b) 19.33 g/mL c) 19.327 g/mL d) 2.0 x 10‚ g/mL e) 19. g/mL 2. About the year 1910 Rutherford and colleagues performed experiments by targeting a stream of alpha particles (+ charged) at a piece of gold foil and recording the deflection of the particles on a sensitive screen. Which of the following statement(s) were conclusion(s) from those experiments? I. most of the volume of the atom is empty space II. the nucleus of an atom is dense and positively charged III. electrons have negligible mass a) I only b) II only c) I and II only d) II and III only e) I, II, and III 3. Chlorine has two stable isotopes with exact masses of 34.96885 amu and 36.96590 amu. What is the relative abundance of the two isotopes? a) 50.00% 35 Cl and 50.00% 37 Cl b) 35.45% 35 Cl and 64.55% 37 Cl c) 64.55% 35 Cl and 35.45% 37 Cl d) 24.33% 35 Cl and 75.77% 37 Cl e) 75.77% 35 Cl and 24.33% 37 Cl 4. The chemical properties of sulfur would be most similar to a) P b) Cl c) Ar d) Se e) As 5. How many grams of CH 4 contain the same number of molecules as 2.50 grams O 2 ? a) 1.25 g b) 0.0781 g c) 0.156 g d) 4.70 x 10 22 g e) 4.88 x 10 −3 g
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Sample 1 2 1 Final 2 6. Which formula represents the binary compound formed by magnesium and nitrogen? a) MgN b) Mg 2 N c) MgN 3 d) Mg 3 N 2 e) Mg 2 N 3 7. What is the correct name for FeSO 4 ? a) iron(III) sulfite b) iron(II) sulfite c) iron(II) sulfate d) iron(II) sulfide e) iron(III) sulfide 8. The formula of the compound ammonium phosphate is a) NH 4 (PO 4 ) 3 b) NH 4 (PO 4 ) 2 c) (NH 4 ) 2 PO 4 d) (NH 4 ) 3 PO 4 e) (NH 4 ) 3 (PO 4 ) 2 9. Serotonin is a neurotransmitter which plays a role as neurons carry messages. The molar mass of serotonin is 176 g/mol. When a 5.31 g sample is analyzed, it was found to contain 3.62 g carbon, 0.362 g hydrogen, 0.844 g nitrogen and 0.482 g oxygen. What is the molecular formula of serotonin? a) C 9 H 10 N 3 O b) C 11 H 14 NO c) C 10 H 12 N 2 O d) C 9 H 8 N 2 O 2 e) C 10 H 26 NO 10. When glucose undergoes complete combustion, the products are carbon dioxide and water. ______ C 6 H 12 O 6 + ______ O 2 ______ CO 2 + ______ H 2 O Which of the following is the most correct set of stoichiometric coefficients to balance this equation? a) 1, 9, 6, 6 b) 1, 6, 6, 6 c) 2, 12, 6, 12 d) 2, 12, 12, 12 e) 1, 9, 12, 12 11. Solutions of barium nitrate and ammonium sulfate are mixed. A white precipitate is observed. Write the balanced net ionic equation. a) Ba 2+ (aq) + SO 4 2− (aq) ! BaSO 4 (s) b) 2 NH 4 + (aq) + SO 4 2− aq) ! (NH 4 ) 2 SO 4 (s) c) NH 4 + (aq) + NO 3 (aq) ! NH 4 NO 3 (s) d) Ba 2+ (aq) + 2 NH 4 + (aq) + 6 H 2 O(l) ! Ba(NO 3 ) 2 (s) + 20 H + e) Ba 2+ (aq) + 2 NH 4 + (aq) + SO 4 2− (aq) ! (NH 4 ) 2 SO 4 (s) + BaSO 4 (s)
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Sample 1 2 1 Final 3 12. Consider the equation: 2 NaI(aq) + Cl
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1110Samplefinal - Sample Chem 121 Final 1. A metal sample...

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