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

43. Name the following molecule.(A) 7-t-butyl-2,2,3,5-tetramethyl-7-propyldecane(B) 6-propyl-2,6-di-t-butylnonane(C) 2,2,5,7,8,8-hexamethyl-3,3-dipropylnonane(D) isonanane

44. A student gave a molecule the following name:2-ethyl-3-methyl-5-isopropylhexaneHowever, her TA pointed out that although the molecule could be drawn correctlyfrom this name, the name violates the systematic rules. What is the correct(systematic) name of the molecule?(A) 3,4-dimethyl-6-isopropylheptane (B) 2-isopropyl-4,5-dimethylheptane(C) 3,4,6,7-tetramethyloctane (D) 2,3,5,6-tetramethyloctane

45. In a lecture, a professor named a molecule 2-ethyl-4-tertiary-butylpentane. A student pointed out that although the correct structure could be drawn from this name, the name did not follow systematic rules. Which of the following is the correct systematic name for the molecule? (A) 2-t-butyl-5-methylhexane (B) 2-ethyl-4,5,5-trimethylhexane (C) 3,5,6,6-tetramethylheptane (D) 2,2,3,5-tetramethylheptane

46. The general name given to hydrocarbons with triple bonds is(A) alkenes (B) alkynes (C) alkanes (D) unsaturated hydrocarbons

47. Name the following molecule.(A) 1-hexyne (B) 2-ethynyl butane(C) 2-ethyl-3-butyne (D) 3-methyl-1-pentyne

48. Which of the following is the alternative name for 1,3-dichorobenzene(A) m-dichlorobenzene (B) o-dichlorobenzene(C) p-dichlorobenzene (D) benzene dichoride

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