Unit 1 Terms

Question 1

electronegativity

Answer 1

the ability of an atom to pull electrons to itself in a chemical bond [0.7 (low) - 4.0 (high) ]

Question 2

Covalent Bonds

Answer 2

a. pure covalent bonds
- equal sharing of electrons [0 - 0.4]
b. polar covalent bonds
- unequal sharing of electrons [0.4 - 2.0]

Question 3

Ionic bonds

Answer 3

• metal & non metal
• transfer of electrons
• NaCl [e.n. 2.0]

Question 4

Dispersion Forces (London Forces)

Answer 4

weakest
- dominant force in atoms and in non polar molecules
- larger molecule atom
- more electrons

Question 5

Dipole-Dipole

Answer 5

strong
- the larger the dipole moment, the greater the dipole-dipole forces
- cannot be non polar

if dipole dipole than aslso LDF

Question 6

Hydrogen Bonds

Answer 6

super dipole-dipole moment,
- H-F, H-N, H-O

if H Bonding than it also has dipole dipole and LDF

Question 7

Ion Dipole

Answer 7

• ionic compound mixed with polar compound the smaller the cation the higher the charge

Question 8

Nonpolar (checklist)

Answer 8

1. central atom has no lone pairs
2. all atoms around are the same
   (just C & H / LDF)
   LDF

Question 9

Polar (checklist)

Answer 9

1. different atoms around
   LDF, Dipole - Dipole (if asked dominant then d-d)

Question 10

Compound with H - F, O, N (IMF)

Answer 10

LDF , D-D, Hydrogen Bonding

Question 11

Crystalline solids

Answer 11

• have a highly ordered arrangement of particles (ions, atoms, molecules) ex. diamond , graphite, salt

Question 12

Simple Cubic

Answer 12

coordination # 6
(8 corner atom) x (1/8 atom) = 1 atom / unit cell
volume unit cell: a ^3 = (2r)^3 = 8r^3
volume atom: 4/3π r^2
volume of total atoms: 4/3 (π) = 4.19 r^3
% occupied = volume of the total / volume of the unit cell x 100
% occupied = 4.19 r^3 / 8r^3 x 100 =