32. Balance the following redox equation in acidic solution. What is the coefficient of　the H⁺ion? CH₃OH(aq) + Cr₂O₇^2-(aq) → CH₂O(aq) + Cr³⁺(aq)
(A) 2
(B) 4
(C) 6
(D) 8

33. Balance the following redox equation in acidic solution. What is the coefficient of the H+ion? MnO4-(aq) + H2O2(aq) → Mn2+(aq) + O2(g)(A) 2 (B) 4 (C) 6 (D) 8

34. Radon is a radioactive isotope which decays by the loss of an alpha particle.What is the second product of this decay?(A)(B)(C)(D)

35. The atomic particle having a mass of 0 amu and a charge of –1 is(A) an electron (B) a neutron (C) an alpha particle (D) a proton

36. The cesium-137 nuclide has a half-life of 30 years. After 90 years, about 9 g remains. The original mass of the cesium-137 is closest to(A) 70 g (B) 50 g (C) 90 g (D) 80 g

37. After 1176 years, 75% of the radioactive nuclides in a particular sample of an isotope have decayed. What is the half-life of this radioactive isotope? (A) 588 years (B) 392 years (C) 2352 years (D) 294 years

38. When the U-235 nucleus is struck with a neutron, the Zn-72 and Sm-160 nuclei are produced along with some neutrons. How many neutrons are emitted? (A) 2 (B) 3 (C) 4 (D) 5

39. decays to . How many beta decays are involved in this decay series?(A) 6 (B) 1 (C) 4 (D) 2

40. Which of the following statements are true?I. The number of protons in an element is the same for all neutral atoms of thatelement.II.The number of electrons in an element is the same for all neutral atoms of thatelement.III. The number of neutrons in an element is the same for all neutral atoms of thatelement.(A) I, II, and III are all true. (B) Only I and II are true.(C) Only II and III are true. (D) Only I and III are true.

41. Which of the following is the correct formula for the alkane that contains ten carbon atoms? (A) C10H22 (B) C10H20 (C) C10H18 (D) C10H10

42. Which of the following is the correct formula for the simplest alkene that contains five carbon atoms? (A) C5H10 (B) C5H8 (C) C5H6 (D) C5H12

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