3: bonding + VSPER theory Flashcards

1
Q

ionic bonding vs covalent bonding?

A

= complete transfer of electron from a less EN to a more EN atom
= sharing of e= btw bonded atoms

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2
Q

crystal lattices are formed by strong (?), resulting in high (?) in ionic compound and short (?)

A

electrostatic forces / melting points / atomic radius

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3
Q

polar covalent molec vs nonpolar covalent? give an example for each

A

= unequal sharing of e- density; forms a dipole moment (H-Cl_
= more equal sharing of e- density; no net dipole moment (Cl-Cl)

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4
Q

how to find formal charge

A

N valence - N owened (lone pairs = 1/2 of bonding pairs)

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5
Q

3 rules to drawing Lewis structure

A
  1. central atom should be the least ∆EN
  2. fulfil full octet, starting from most ∆EN
  3. formal charge should be on most ∆EN
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6
Q

T OR F:

  1. reasonance structures differ only in location of nuclei and e-
  2. they are snapshots of the structures tht exist at nay given moments in time
A

ALL FALSE

correct reasonance structures differ only in the e- position
real structures are averages of reasonance structures; rep as reasonance hybrid

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7
Q

for line diagram, H atoms bonded to C while lone pair for others; in double bonds there’s 2 C

A
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8
Q

what does VSPER theory assumes?

A
  1. e- pairs occupy the valence shell of central atom
  2. regions of e- density repel e/o to maximize separation
  3. lone pairs repel more than bonding paris
  4. multiple bonds = 1 region
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9
Q

explain the dash-line-wedge symbolism?

A

line: on plane
dashed: away from you
wedge line: towards you

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10
Q

assign electronic arrangement for 2 / 3 / 4 / 5 / 6 regions

A

2- linear
3- trigonal planar
4- tetrahedral
5- trig bypiramidal
6- octahedral

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