#1: Electronegativity, Intermolecular Forces, Water

Question 1

Electronegativity (En)

Answer 1

Represents strength with which an element will attract a shared pair of electrons in covalent bond

Question 2

When En high…

Answer 2

Element has a high tendency to attract electrons in covalent bond (S-)

Question 3

When En low…

Answer 3

Element has low tendency to attract electrons in covalent bond (S+)

Question 4

Polar Molecules

Answer 4

Unequal sharing of electrons

Question 5

London Force

Answer 5

Weakest

Between Non-polar molecules

Question 6

Dipole-Dipole

Answer 6

Stronger than LD

Formed between S+ and S- sides of polar molecules

Question 7

Hydrogen bonds

Answer 7

Strong DD

Formed between H atoms and N, O, F atoms

Question 8

INTRAmolecular forces

Answer 8

Exist WITHIN molecule

Question 9

INTERmolecular forces

Answer 9

Forces of attraction BETWEEN molecules

Question 10

Water

Answer 10

Colourless, tasteless, odourless

Polar

Question 11

Cohesion (water)

Answer 11

Form H-Bonds with other water molecules

Question 12

Adhesion (water)

Answer 12

Form H-bonds with other polar molecules

Question 13

Unique Characteristics of Water (3)

Answer 13

1. High heat capacity - result of H-bonds, can absorb lots of heat energy with min. temp change
2. High specific heat of vaporization- lots of energy needed to convert water from liquid to gas
3. Ice is less dense that liquid water - due to crystal formation and fewer formations of H-bonds, ice densest at 4 degrees Celsius

Question 14

Importance

Answer 14

Temp regulation, moisture, lubrication (joints), chemical reactions, diffusion/osmosis, solvent

Question 15

Hydrophilic

Answer 15

Polar/charged molecule strongly attracted to water

Question 16

Hydrophobic

Answer 16

Non-polar molecule not strongly attracted to water