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Chemistry LibreTexts

1.2: Chapter 1-3 Answers

  • Page ID
    218636
  • 1. C

    2. Three: 2px, 2py, 2pz

    3. Six

    4.

     

    5.

     

    6.

     

    7. +1

    8. B

    9. Zero

    10. B and C only. Atoms have been moved in A, which is not allowed

    11. 

    12. A

    13. TRUE

    14.

    15.

    16. False

    17. B

    18.

    19. D

    20. B

    21. Molecular orbitals

    22. Sigma

    23. Pi

    24. B

    25. 180 degrees

    26. 109.5 degrees

    27. 120 degrees

    28. sp2 /120

    29. sp3/tetrahedral

    30. C

    31. sp2

    32. sp

    33. Six. The triple bond contains two of them.

    34. B

    35. The alcohol, CH3CH2CH2OH, has the higher boiling point, since it is capable of intermolecular hydrogen bonding. The ether is not.

    36. CH3CH2CH2NH2 has the higher boiling point, since it is capable of intermolecular hydrogen bonding.

    37. The alcohol, CH3CH2OH, is more soluble in water since it can form a hydrogen bond to water and accept a hydrogen bond from water. The ether, CH3OCH3, can only accept a hydrogen bond from water.

    38. The amine, (CH3)2NH, is more soluble in water since it can hydrogen bond with water. Alkanes are not capable of hydrogen bonding with water.

    39. Structural isomers: same molecular formulas, but different atom connectivities.

    40. Structural isomers

    41. Geometric (cis-trans) isomers: They owe their existence to hindered rotation around the pi-bond.

    42. Structural isomers

    43. Structural isomers

    44. Geometric (cis-trans) isomers:

    45. B

    46. E

    47. E

    48. Carboxylic acid:

    49. 14 sigma bonds and 3 pi bonds. You must count every C-C and C-H bond. The CN bond is a triple bond, which alone accounts for two pi and one sigma bond.

    50. 6 sigma bonds and 3 pi bonds.

    51. E. There is no sp3 oxygen in the molecule.

    52.

    53. 2,5-dimethylheptane

    54. 2,2-dimethyl-5-(1-methylpropyl)nonane

    55. 4-(1-methylethyl)decane

    56. 3-ethyl-7-methyl-5-propylnonane

    57.

    58. 

    59. 

    60. trans-1-ethyl-2-methylcyclopentane

    61. 1-bromo-4,4-dimethylcyclohexane

    62. 2-iodo-2-methylpentane

    63. cis-1, 2-dichlorocyclopentane

    64. (CH3)2CH-I

    65. CH3CH2CH2CH(CH3)CH2CH2Br

    66. B (Isoproyl chloride). Chlorine is attached to a secondary carbon.

    67. E (Isobutyl chloride). Chlorine is attached to a primary carbon:

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