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CHEM 431 > Lecture 4 (Bonding models, VSEPR, etc.) > Flashcards

Lecture 4 (Bonding models, VSEPR, etc.) Flashcards

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1
Q

What is valence-shell electron-pair repulsion?

A

Each valence electron pair of the central atom is stereochemically significant and these repulsions determine the molecular shape.

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2
Q

What does central atom geometry depend on?

A

the number of electron domains, that are spaced out to minimize inter-electronic repulsions

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3
Q

In trigonal bipyramidal structures, lone pairs and multiple bonded atoms occupy what positions?

A

equatorial

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4
Q

In pseudo-octahedral structures, lone pairs and multiple bonded atoms are in what position?

A

trans to each other

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5
Q

VSEPR for 2 bonds no lone pairs?

A

Linear

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6
Q

VSEPR for 3 bonds and no lone pairs?

A

Trigonal planar

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7
Q

VSEPR for 4 bonds and no lone pairs?

A

Tetrahedral

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8
Q

VSEPR for 5 bonds and no lone pairs?

A

Trigonal Bipyramidal

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9
Q

VSEPR for 6 bonds and no lone pairs?

A

Octahedral

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10
Q

VSEPR for 2 bonds and 1 lone pair?

A

Bent

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11
Q

VSEPR for 3 bonds and 1 lone pair?

A

Trigonal Pyramidal

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12
Q

VSEPR for 4 bonds and 1 lone pair?

A

Disphenoidal

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13
Q

VSEPR for 5 bonds for 1 lone pair?

A

Square Pyramidal

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14
Q

VSEPR for 2 bonds and 2 lone pairs?

A

Bent

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15
Q

VSEPR for 3 bonds for 2 lone pairs?

A

T-shape

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16
Q

VSEPR for 4 bonds and 2 lone pairs?

A

Square Planar

17
Q

VSEPR for 2 bonds and 3 lone pairs?

A

Linear

18
Q

VSEPR for 3 bonds and 3 lone pairs?

A

T-shape

19
Q

VSEPR for 2 bonds and 4 lone pairs?

A

Linear

20
Q

More electronegative atoms cause electron density to be …

A

closer towards the atom and therefore make electrons repel each other (make a bigger bond angle)

21
Q

What is the Valence Bond Theory

A

When the bonding of individual atoms interact, they will retain their original character

22
Q

How are hybrid orbitals generated?

A

by mixing the atomic orbitals

23
Q

How to make a VBT diagram (step-by-step)?

A

1) Find Lewis Structure
2) Make VSEPR
3) Draw the 2s and 2p orbitals and fill the electrons in, as well as drawing the orbitals of the full electron configuration

CHEM 431 (21 decks)

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