1992 AP - U.S National Chemistry Olympiad 1992 Local...

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U.S. National Chemistry Olympiad: 1992 Local Section Test Go to Answers 1. Which represents the 235 U atom? Protons Electrons Neutrons (A) 46 46 143 (B) 92 92 92 (C) 92 92 143 (D) 92 92 146 2. One mole of an element contains 4.82 x 10 24 electrons. What is the atomic number of the element? (A) 2 (B) 4 (C) 6 (D) 8 3. How many H atoms are contained in 1.50 g of glucose (C 6 H 12 O 6 )? (A) 3.01 x 10 22 (B) 1.20 x 10 23 (C) 2.40 x 10 23 (D) 6.02 x 10 22 4. Which contains the greatest mass of chlorine? (A) 5.0 g Cl 2 (B) 30.0 g MgCl 2 (C) 0.50 mol Cl 2 (D) 0.90 mol KCl 5. A particular chlorofluorocarbon (CFC) contains 9.93% C, 31.43% F, and 58.64% Cl by mass. Its molar mass is 120.9 g/mol. How many F atoms are in one molecule? (A) 1 (B) 2 (C) 3 (D) 4 6. On heating, Cl 2 O 7 decomposes to form Cl 2 and O 2 . What is the ratio of chlorine to oxygen
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molecules in the product? (A) 2 to 7 (B) 2 to 14 (C) 3 to 7 (D) 4 to 7 7. What is the coefficient for Fe 2+ when the redox equation is Fe 2+ + MnO 4 ¯ + H + ---> Fe 3+ + Mn 2+ + H 2 O is balanced when using the smallest whole-number coefficients? (A) 2 (B) 3 (C) 4 (D) 5 8. Hydrogen peroxide, H 2 O 2 , in the presence of a catalyst decomposes into water and oxygen gas. How many mL of O 2 at STP are produced from the decomposition of 5.0 g of H 2 O 2 ? (A) 230 mL (B) 460 mL (C) 870 mL (D) 1650 mL 9. Which statement pertains to the measured pressure of gas collected when O 2 is collected over water? (A) It is greater than the pressure of dry O 2 (B) It is less than the pressure of dry O 2 (C) It is equal to the pressure of dry O 2 (D) It varies inversely with the pressure of dry O 2 10. Which observation is an exception to the behavior predicted by kinetic molecular theory? (A) When propane gas is subjected to a high enough pressure, it liquifies. (B) When an inflated balloon is placed in liquid nitrogen, it flattens, but regains its shape when returned to room temperature. (C) Tire pressure readings are higher when tires are hot after a long trip. (D) When the button on a spray can is pushed, the material inside flows out of the can. 11. A gas has a density of 4.36 g L¯ 1 at 20 °C and a pressure of 1.25 atm. Which noble gas best fits these data? (A) Ne
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(B) Ar (C) Kr (D) Xe 12. A gas is likely to behave in a non-ideal fashion in all of the situations given except (A) At very low temperatures, because the particles have insufficient kinetic energy to overcome intermolecular attractions. (B) in mixtures of gases where the molecules are polar, because intermolecular forces are more likely. (C) at standard temperature and pressure, because intermolecular interations are minimized. (D) at very high pressures, because the distance between molecules is likely to be small in relation to molecular diameter. 13. A sample of gas originally occupies 2.56 L at a temperature of 25 °C and a pressure of 686
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1992 AP - U.S National Chemistry Olympiad 1992 Local...

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