Ch.6 study

Question 1

VESPR theory

Answer 1

Describes the orientation of electron groups around the central atom
States electron groups are arranged as far apart as possible around the central atom
States the specific shape of a molecule is determined by the number of atoms attached to the central atom

Question 2

Linear

Answer 2

2 bonded atoms
0 lone pairs
180 degree angle
Linear molecule shape

Question 3

Trigonal planar (trigonal planar)

Answer 3

3 bonded atoms
0 lone pairs
120 degree angle

Question 4

Trigonal planar (bent)

Answer 4

2 bonded atoms
1 lone pair
120 degree angle

Question 5

Tetrahedral (tetrahedral)

Answer 5

4 bonded atoms
0 lone pairs
109 degrees

Question 6

Tetrahedral (Trigonal pyramidal)

Answer 6

3 bonded atoms
1 lone pair
109 degrees

Question 7

Tetrahedral (bent)

Answer 7

2 bonded atoms
2 lone pairs
109 degrees

Question 8

Electronegativity values

Answer 8

H= 2.1
B= 2.0
C= 2.5
N=3.0
O= 3.5
F= 4.0
Al= 1.5
Si= 1.8
P=2.1
S=2.5
Cl= 3.0
Ga= 1.6
Ge= 1.8
As= 2.0
Se= 2.4
Br= 2.8
In= 1.7
Sn= 1.8
Sb= 1.9
Te= 2.1
I= 2.5
Li= 1.0
Be= 1.5
Na= 0.9
Mg= 1.2
K= 1.8
Ca= 1.0

Question 9

Hydrogen bonds can only form with?

Answer 9

Flourine (F)
Oxygen (O)
Nitrogen (N)

Question 10

Hydrogen bonds are all dipole dipole interactions

Answer 10

True

Question 11

Dispersion forces

Answer 11

Weak attractions between nonpolar molecules
Caused by temporary dipoles that develop when molecules bump into each other
Makes it possible for nonpolar molecules to form liquids and solids

Question 12

Melting points

Answer 12

Lower due to weak forces like dispersion forces
Higher due to stronger forces like hydrogen bonding
Highest in ionic compounds