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51. When 10 cm3 of a gaseous hydrocarbon is burned in excess oxygen, the products consist of 30 cm3 of carbon dioxide and 30 cm3 of water vapor, measured under the same conditions of temperature and pressure. Determine the molecular formula of the hydrocarbon CxHy. (A) x=2, y=4 (B) x=3, y=6 (C) x=4, y=8 (D) x=5, y=10

52. What information about the structure of a hydrogen atom can be gained from its emission spectrum? (A) The electron in the hydrogen atom is held near the nucleus. (B) The electron may exist in any of several energy levels. (C) Most of the mass of the atom is in its nucleus. (D) A hydrogen atom contains one proton and one electron.

53. Which of the following compound is the most ionic? (A) Al2O3 (B) MgCl2 (C) HCl (D) KF

54. The following reaction achieves equilibrium at 400K: 4H2(g) + 2NO(g) →2H2O(g) + N2(g) At constant temperature, increasing the volume of the reaction vessel will (A) increase the reaction rate. (B) condense water vapor into liquid. (C) produce more hydrogen gas. (D) produce less nitrogen monoxide.

55. Which methods will help us to distinguish between equimolar solutions of a strong base and a strong acid? I. Add magnesium to each solution and look for the formation of gas bubbles . II. Add aqueous sodium hydroxide to each solution and measure the temperature change. III. Measure the electrical conductivity of each solutions. (A) I and II only (B) I and III only (C) II and III only (D) I, II, and III

56. The data in the table below were obtained for the reaction A + B → C. Which of the following is the rate law for the reaction? (A) Rate = k[A] (B) Rate = k[A][B] (C) Rate = k [A][B]2 (D) Rate = k[B] 7

57. During the electrolysis of a molten salt, which statement is not correct? (A) The ions only move when a current flows. (B) Positive ions are attracted to the negative electrode. (C) Positive ions gain electrons at the negative electrode. (D) Negative ions lose electrons at the positive electrode.

58. Sn(s) + 2Fe3+(aq) → Sn2+(aq) + 2Fe2+(aq) Tin metal reacts with aqueous Fe3+ ions according to the equation above. Which of the following factors will increase the rate of this reaction? I. Increasing the ion concentration Fe3+ II. Decreasing the size of the tin pieces (A) I only (B) II only (C) Both I and II (D) Neither I nor II

59. The curve above is obtained for the reaction of an excess of CaCO3 with hydrochloric acid. How and why does the rate of reaction change with time?(A)(B)(C)(D)

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