molecular geometry & bonding theories (9.0-9.3)

Question 1

what are bond angles and bond lengths?

Answer 1

the positions of the atoms that is bond angle and bond lengths determine the shape and size of molecules

Question 2

what are electron domains?

Answer 2

directions to which the electron point is at/ a bond (single/double/triple) is one electron domain
- a lone pair of electrons is also one electron domain
-

Question 3

Valence shell electron pair repulsion (VSEPR) model

Answer 3

• best arrangement of a given number of electron domains that the one that minimizes the repulsion among them
• in VSEPR you count the number of electron domains around the central atom

Question 4

VSEPR Molecular geometries

Answer 4

1. draw the best lewis structure
2. determine the electron domain
3. use the arrangement of the bonded atoms to determine the molecular geometry

Question 5

liner electron domain

Answer 5

• number of electron domains (2)
• bonding domains (2)
• nonbonding domains (0)
• molecular geometry (linear)

Question 6

trigonal planar electron domain

Answer 6

two geometries (trigonal planar, bent, trigonal planar)

Question 7

bent electron domain for trigonal planer

Answer 7

if one of the domains is a lone pair

Question 8

trigonal planar electron domain

Answer 8

is all electron domains are bonds

Question 9

tetrahedral electron domain

Answer 9

• three different molecular geometries (tetrahedral four bonds, trigonal pyramidal one lone pair, bent two lone pairs and two bonds)

Question 10

nonbonding paids and bond angle

Answer 10

nonbonding pairs are physically larger than bonding pairs. therefore their repulsions are greater and their tends to compress bond angle

Question 11

multiple bonds and bond angle

Answer 11

• double and triple bonds have larger electron domains than single bonds
• they exert a greater repulsive force than single bonds, making their bond angles greater.

Question 12

trigonal bipyramdial bond angle

Answer 12

• number of electron domains (5)
• predicted bond angles (120 and 90)
• there are two distinct positions in this geometry (axial, equatorial)

Question 13

octahedral bond angle

Answer 13

• number of electron domains (6)
• predicted bond angle (90)