VSEPR Flashcards: Molecular Geometry & Bond Angles

このデッキのカード

1. カード 1

   質問

   In VSEPR, what is an electron domain around a central atom?

   回答

   A region of electron density: one bond to a neighboring atom, regardless of bond order, or one lone pair.

2. カード 2

   質問

   What does the VSEPR model use to predict a central atom’s geometry?

   回答

   Repulsion between electron domains. The domains favor an arrangement that reduces their mutual repulsion.

3. カード 3

   質問

   In AXₙEₘ notation, what does A represent?

   回答

   The central atom whose local geometry is being described.

4. カード 4

   質問

   How do electron geometry and molecular geometry differ in VSEPR?

   回答

   Electron geometry includes all electron domains. Molecular geometry describes the arrangement of atoms around the central atom, leaving lone pairs out of the shape name.

5. カード 5

   質問

   How many VSEPR domains does one triple bond contribute at either bonded atom?

   回答

   One domain. Three shared electron pairs occupy one bonding direction.

6. カード 6

   質問

   In AXₙEₘ notation, what does n count?

   回答

   Atoms directly bonded to the central atom. A double or triple bond still contributes one X.

7. カード 7

   質問

   For a molecule with several central atoms, where do you apply VSEPR?

   回答

   At each central atom separately, using its own bonded neighbors and lone pairs.

8. カード 8

   質問

   In AXₙEₘ notation, what does m count?

   回答

   Lone pairs on the central atom. E counts pairs, not individual electrons.

9. カード 9

   質問

   For an AXₙEₘ center in the usual closed-shell VSEPR model, how many electron domains are present?

   回答

   n + m domains: bonded neighbors plus lone pairs.

10. カード 10

    質問

    VSEPR molecular shape of AX₂, with no lone pairs on A?

    回答

    Linear. The two bonded atoms lie on opposite sides of the central atom.

11. カード 11

    質問

    VSEPR molecular shape of AX₃, with no lone pairs on A?

    回答

    Trigonal planar. The central atom and three bonded atoms lie in one plane.

12. カード 12

    質問

    In an X–A–X bond angle, at which atom is the angle measured?

    回答

    At A, the central atom, between the two bonds to X atoms.

13. カード 13

    質問

    Does a lone pair count as one VSEPR domain or two?

    回答

    One domain. The pair contains two electrons, but it occupies one region around the central atom.

14. カード 14

    質問

    VSEPR molecular shape of AX₄, with no lone pairs on A?

    回答

    Tetrahedral. The four bonded atoms occupy the corners of a tetrahedron around A.

15. カード 15

    質問

    VSEPR molecular shape of AX₂E?

    回答

    Bent, also called angular or V-shaped. There are two bonded atoms and one lone pair around A.

16. カード 16

    質問

    What is the ideal X–A–X bond angle in AX₂ with no lone pairs?

    回答

    180°.

17. カード 17

    質問

    What electron geometry does VSEPR assign to three domains around a central atom?

    回答

    Trigonal planar.

18. カード 18

    質問

    VSEPR molecular shape of AX₃E?

    回答

    Trigonal pyramidal. Three bonded atoms and one lone pair occupy four electron domains.

19. カード 19

    質問

    What is the ideal X–A–X bond angle in tetrahedral AX₄?

    回答

    About 109.5°.

20. カード 20

    質問

    A central atom has two bonded neighbors and two lone pairs. What is its AXE notation?

    回答

    AX₂E₂.

21. カード 21

    質問

    What is the ideal X–A–X bond angle in trigonal planar AX₃?

    回答

    120°.

22. カード 22

    質問

    VSEPR molecular shape of AX₂E₂?

    回答

    Bent, also called angular or V-shaped. Two lone pairs occupy the other two domains.

23. カード 23

    質問

    What is the electron geometry around A in AX₃E?

    回答

    Tetrahedral: three bonding domains plus one lone-pair domain.

24. カード 24

    質問

    In O=C=O, how many electron domains surround carbon?

    回答

    Two domains. Each C=O double bond counts once.

25. カード 25

    質問

    What is the electron geometry around A in AX₂E?

    回答

    Trigonal planar: two bonding domains plus one lone-pair domain.

26. カード 26

    質問

    What molecular shape does VSEPR predict around carbon in CH₄?

    回答

    Tetrahedral. Carbon has four bonded neighbors and no lone pairs.

27. カード 27

    質問

    A learner counts a double bond as two VSEPR domains. What should they correct?

    回答

    Count it as one domain. Bond order changes the number of shared electrons, not the number of bonded directions.

28. カード 28

    質問

    What molecular shape does VSEPR predict around nitrogen in NH₃?

    回答

    Trigonal pyramidal. Nitrogen has three bonded neighbors and one lone pair.

29. カード 29

    質問

    What electron geometry does VSEPR assign to four domains around a central atom?

    回答

    Tetrahedral.

30. カード 30

    質問

    What molecular shape does VSEPR predict around oxygen in H₂O?

    回答

    Bent. Oxygen has two bonded neighbors and two lone pairs.

31. カード 31

    質問

    What molecular shape does VSEPR predict around carbon in the carbonate ion, CO₃²⁻?

    回答

    Trigonal planar. The three C–O bonding directions give three domains, even when a Lewis structure shows one double bond.

32. カード 32

    質問

    In the simple VSEPR model, how does a central lone pair usually affect neighboring bond angles?

    回答

    It tends to compress nearby bond angles because its electron density occupies more space near the central atom. This is a qualitative tendency, not a fixed number of degrees.

33. カード 33

    質問

    A VSEPR center is trigonal pyramidal with four total domains. What is its AXE notation?

    回答

    AX₃E: three bonded atoms and one lone pair.

34. カード 34

    質問

    Which two common AXE cases give a bent molecular shape with three or four total domains?

    回答

    AX₂E with three domains, and AX₂E₂ with four domains. Their electron geometries differ.

35. カード 35

    質問

    What electron geometry does VSEPR assign to five domains around a central atom?

    回答

    Trigonal bipyramidal.

36. カード 36

    質問

    What electron geometry does VSEPR assign to six domains around a central atom?

    回答

    Octahedral.

37. カード 37

    質問

    Does an ideal VSEPR angle give the exact measured angle in every molecule of that shape?

    回答

    No. It is a geometric benchmark; lone pairs and the bonding environment can change actual angles.

38. カード 38

    質問

    How many axial and equatorial positions are in a trigonal bipyramid?

    回答

    Two axial positions and three equatorial positions.

39. カード 39

    質問

    VSEPR molecular shape of AX₅, with no lone pairs on A?

    回答

    Trigonal bipyramidal.

40. カード 40

    質問

    VSEPR molecular shape of AX₆, with no lone pairs on A?

    回答

    Octahedral.

41. カード 41

    質問

    VSEPR molecular shape of AX₄E in the usual lowest-repulsion arrangement?

    回答

    Seesaw. The lone pair occupies an equatorial position in a trigonal-bipyramidal domain arrangement.

42. カード 42

    質問

    In an ideal trigonal bipyramid, what is the angle between two equatorial bonds?

    回答

    120°.

43. カード 43

    質問

    VSEPR molecular shape of AX₃E₂ in the usual lowest-repulsion arrangement?

    回答

    T-shaped. Both lone pairs occupy equatorial positions.

44. カード 44

    質問

    VSEPR molecular shape of AX₅E?

    回答

    Square pyramidal. One lone pair occupies the sixth position of an octahedral domain arrangement.

45. カード 45

    質問

    In an ideal trigonal bipyramid, what is the angle between an axial bond and an equatorial bond?

    回答

    90°.

46. カード 46

    質問

    VSEPR molecular shape of AX₂E₃ in the usual lowest-repulsion arrangement?

    回答

    Linear. Three equatorial lone pairs leave the two bonded atoms in opposite axial positions.

47. カード 47

    質問

    VSEPR molecular shape of AX₄E₂ in the usual lowest-repulsion arrangement?

    回答

    Square planar. Two opposite lone pairs leave four bonded atoms in a square around A.

48. カード 48

    質問

    In a trigonal-bipyramidal domain arrangement, which sites do lone pairs preferentially occupy?

    回答

    Equatorial sites, in the usual VSEPR arrangements with one to three lone pairs.

49. カード 49

    質問

    Which X–A–X angles occur in an ideal octahedral AX₆ molecule?

    回答

    90° between adjacent bonds and 180° between opposite bonds.

50. カード 50

    質問

    A VSEPR center has a seesaw shape and five total domains. What is its AXE notation?

    回答

    AX₄E.

51. カード 51

    質問

    A VSEPR center has a T-shaped molecular geometry and five total domains. What is its AXE notation?

    回答

    AX₃E₂.

52. カード 52

    質問

    In an ideal trigonal bipyramid, what is the angle between its two axial bonds?

    回答

    180°. The axial positions lie on opposite sides of the central atom.

53. カード 53

    質問

    A VSEPR center is square pyramidal with six total domains. What is its AXE notation?

    回答

    AX₅E.

54. カード 54

    質問

    In the usual octahedral AX₄E₂ arrangement, how are the two lone pairs positioned relative to each other?

    回答

    Opposite each other, 180° apart in the ideal domain arrangement.

55. カード 55

    質問

    What molecular shape does VSEPR predict for an isolated SF₄ molecule?

    回答

    Seesaw. Sulfur has four bonded fluorine atoms and one lone pair.

56. カード 56

    質問

    What molecular shape does VSEPR predict for an isolated XeF₂ molecule?

    回答

    Linear. Xenon has two bonded fluorine atoms and three lone pairs.

57. カード 57

    質問

    What is the electron geometry around A in AX₃E₂?

    回答

    Trigonal bipyramidal: three bonding domains plus two lone-pair domains.

58. カード 58

    質問

    What molecular shape does VSEPR predict for an isolated BrF₅ molecule?

    回答

    Square pyramidal. Bromine has five bonded fluorine atoms and one lone pair.

59. カード 59

    質問

    What molecular shape does VSEPR predict for an isolated XeF₄ molecule?

    回答

    Square planar. Xenon has four bonded fluorine atoms and two opposite lone pairs.

60. カード 60

    質問

    What is the electron geometry around A in AX₄E?

    回答

    Trigonal bipyramidal: four bonding domains plus one lone-pair domain.

61. カード 61

    質問

    What molecular shape does VSEPR predict for an isolated ClF₃ molecule?

    回答

    T-shaped. Chlorine has three bonded fluorine atoms and two equatorial lone pairs.

62. カード 62

    質問

    What is the electron geometry around A in AX₅E?

    回答

    Octahedral: five bonding domains plus one lone-pair domain.

63. カード 63

    質問

    What is the electron geometry around A in AX₂E₃?

    回答

    Trigonal bipyramidal: two bonding domains plus three lone-pair domains.

64. カード 64

    質問

    What molecular shape does VSEPR predict for an isolated SF₆ molecule?

    回答

    Octahedral. Sulfur has six bonded fluorine atoms and no lone pairs.

65. カード 65

    質問

    Which bond angles occur in an idealized T-shaped AX₃E₂ arrangement?

    回答

    90° and 180°. These are parent-geometry benchmarks; a real molecule can be distorted.

66. カード 66

    質問

    What is the electron geometry around A in AX₄E₂?

    回答

    Octahedral: four bonding domains plus two lone-pair domains.

67. カード 67

    質問

    Why does an octahedral VSEPR arrangement have six domains despite the name’s reference to eight?

    回答

    The six domains point toward the six vertices of an octahedron. Eight refers to the solid’s faces.

68. カード 68

    質問

    Why does a lone pair in AX₄E favor an equatorial site over an axial site?

    回答

    An equatorial site has two 90° interactions with other domains; an axial site has three. The equatorial choice reduces these close repulsions.

69. カード 69

    質問

    Which common AXE cases give a linear molecular shape with two or five total domains?

    回答

    AX₂ with two domains, and AX₂E₃ with five domains. A linear shape alone does not determine the electron geometry.

70. カード 70

    質問

    Which bond angles occur in an idealized square-pyramidal AX₅E arrangement?

    回答

    90° and 180°. Actual angles can deviate from these octahedral parent benchmarks.

71. カード 71

    質問

    A VSEPR center is square planar with six total domains. What is its AXE notation?

    回答

    AX₄E₂.

72. カード 72

    質問

    A learner assigns every bent molecule the same bond angle. What information are they missing?

    回答

    The electron-domain arrangement and the particular molecule. Bent includes AX₂E and AX₂E₂, and actual angles depend on the species.

73. カード 73

    質問

    A learner calls NH₃ tetrahedral because nitrogen has four domains. What shape distinction resolves the error?

    回答

    Tetrahedral is its electron geometry. Its molecular geometry is trigonal pyramidal because only the three bonded atoms define that shape.

74. カード 74

    質問

    Why can four bonded atoms give tetrahedral AX₄ but square planar AX₄E₂?

    回答

    AX₄ has four total domains. AX₄E₂ has six total domains, with two opposite lone pairs in an octahedral arrangement.

75. カード 75

    質問

    Which ideal parent angles are the benchmarks for an AX₄E seesaw arrangement?

    回答

    90°, 120°, and 180° from trigonal-bipyramidal electron geometry. Lone-pair repulsion can distort the actual bond angles.

76. カード 76

    質問

    What molecular shape does VSEPR predict for an isolated PF₅ molecule?

    回答

    Trigonal bipyramidal. Phosphorus has five bonded fluorine atoms and no lone pairs.

77. カード 77

    質問

    What is the electron geometry around A in AX₂E₂?

    回答

    Tetrahedral: two bonding domains plus two lone-pair domains.

78. カード 78

    質問

    Which X–A–X bond angles occur in an ideal square-planar AX₄E₂ arrangement?

    回答

    90° between adjacent bonds and 180° between opposite bonds.

78枚のカード

VSEPR Flashcards: Molecular Geometry & Bond Angles

このデッキを無料で学習

Nibomo が開き、すぐに学習を始められます。