CHEM 116 Practice Test 1B-1 PDF

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Second Chem. Basics practice test #2 w/ answers...

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Practice Test 1B, CHEM 116 Fall 2019 1. Convert 22 m3 to liters. (a) 2.2×10–2 L (b) 2.2 L (c) 2.2×102 L (d) 2.2×104 L 2. Determine the density of an object that has a mass of 149.8 g and displaces 12.1 mL of water when placed in a graduated cylinder. (a) 8.08 g/mL (b) 1.38 g/mL (c) 12.4 g/mL (d) 18.1 g/mL (e) 11.4 g/mL 3. Methane and oxygen react to form carbon dioxide and water. What mass of water is formed if 9.6 g of methane reacts with 38.4 g of oxygen to produce 26.4 g of carbon dioxide? (Hint: Consider the law of conservation of mass.) (a) 21.6 g (b) 26.4 g (c) 44.4 g (d) 48.0 g 4. Which one of the following contains 52% carbon by mass? (a) C2H2 (b) CH4 (c) CH3OCH3 (d) CO2 5. Which of the following elements is an alkali metal? (a) U (b) C (c) F (d) K (e) Ca 6. Which of the following elements has chemical properties similar to selenium? (a) bromine (b) lithium (c) nitrogen (d) sulfur (e) helium

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Practice Test 1B, CHEM 116 Fall 2019 7. If a corpse is frozen at 18.5 K, what is the temperature in degrees Celsius and Fahrenheit? (a) -254.7 °C, -426.4 °F (b) -291.5 °C, -426.4 °F (c) -254.7 °C, -394.4 °F (d) -254.7 °C, -458.4 °F (e) -291.7 °C, -493.4 °F 8. If starch has a density of 1.53 g cm–3, what volume (in Liters) would be required to provide 225 lbs of starch? (1 lb. = 453.592 g) (a) 0.147 L (b) 147 L (c) 6.67 x 103 L (d) 66.7 L (e) None of the above 9. How many atoms of carbon are there in 15.30 g of the explosive RDX: C3H6N6O6 (a) 2.311 x 1023 C atoms (b) 1.244 x 1023 C atoms (c) 3.489 x 1023 C atoms (d) 4.127 x 1023 C atoms (e) None of the above 10. Iridium contains two isotopes. Ir – 191 has a mass of 190.960 amu and an abundance of 37.300%. What is the isotopic mass of the other isotope, Ir– 193? (a) 192.94 amu (b) 193.12 amu (c) 192.20 (d) 192.79 (e) None of the above 11. What is the chemical formula for the following compound: dichlorine dioxide? (a) Cl4O2 (b) ClO (c) Cl2O2 (d) Cl2O (e) None of the above 12. What is the name of the following compound: BaSO3? (a) Barium Sulfate (b) Barium Sulfite (c) Barium (II) Sulfate (d) Barium (II) Sulfite (e) None of the above

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Practice Test 1B, CHEM 116 Fall 2019 A certain organic compound was found to contain 47.4 % carbon, 10.6 % hydrogen, and the remaining mass was due to oxygen. 13. What is the empirical formula of the compound? (a) CH4O2 (b) C3H4O (c) CH4O (d) C3H8O2 (e) None of the above 14. The molecular mass of the true compound was found to be 152 amu. What is the molecular formula of the compound? (a) C3H8O2 (b) C6H8O2 (c) C9H24O6 (d) C3H16O2 (e) None of the above If Dr. Romonosky has averaged 32.0 fl. oz. (946 mL) of coffee per day for the last 10 years: 15. How many gallons of coffee has she drank? (1 gal = 3.785 L; use 365 days in a year) (a) 9.1 gal (b) 912 gal (c) 9100 gal (d) 91 gal (e) 9.12 x 105 gal 16. If each 8.0 fl. oz. serving has 95 mg of caffeine, how many kilograms of caffeine has she consumed during this time? (a) 0.1168 kg (b) 116.8 kg (c) 1387 kg (d) 3.65 kg (e) 1.387 kg 17. Calculate to the correct number of significant figures: (512 ÷ 986.7) +5.44 (a) 5.96 (b) 6.0 (c) 5.959 (d) 5.9589 (e) None of the above 18. Perform the unit conversion for: 109 mm to in (2.54 cm = 1 in) (a) 42.9 (b) 4.29 (c) 0.429 (d) 27.69 (e) None of the above Page 3 of 5

Practice Test 1B, CHEM 116 Fall 2019 19. Perform the unit conversion: 5394 cm3 to L (a) 539.4 L (b) 53.94 L (c) 2.123 L (d) .2123 L (e) None of the above 20. What is the name of the following compound: Cr2S3 (a) Chromium (II) sulfide (b) Chromium (III) sulfide (c) Chromium (II) sulfate (d) Chromium (III) sulfate (e) Chromium (II) sulfite 21. What is the name of the following hydrated ionic compound: CoSO4 • 7 H2O (a) Cobalt (II) sulfite heptahydrate (b) Cobalt (II) sulfite hexahydrate (c) Copper (II) sulfate heptahydrate (d) Cobalt (III) sulfate heptahydrate (e) Cobalt (II) sulfate heptahydrate 22. Solid sodium is added to liquid water and reacts to produce hydrogen gas and aqueous sodium hydroxide. What is the balanced chemical equation for this reaction? (a) Na (s) + H2O (l) → H2 (g) + NaOH (aq) (b) Na (s) + 2 H2O (l) → H2 (g) + Na(OH)2 (aq) (c) 2 Na (s) + 2 H2O (l) → H2 (g) + 2 NaOH (aq) (d) Na (s) + 2 H2O (l) → 2 H2 (g) + Na(OH)2 (aq) (e) None of the above 23. For the hydrocarbon pentane, how many carbon atoms does this molecule have? (a) 1 (b) 2 (c) 3 (d) 4 (e) 5 24. What is the empirical formula for a decomposition process that produces 1.651 g Ag and 0.1224 g O? (a) AgO (b) AgO2 (c) Ag2O2 (d) Ag3O (e) None of the above

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Practice Test 1B, CHEM 116 Fall 2019 Answer Key: 1. D 2. C 3. A 4. C 5. D 6. D 7. A 8. D 9. B 10. A 11. C 12. B 13. D 14. E 15. B 16. E 17. A 18. B 19. E 20. A 21. E 22. C 23. E 24. E

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