Week 2 Day 1 States of Matter

Question 1

gas —–> solid

Answer 1

deposition

Question 2

solid ——–> gas

Answer 2

sublimation

Question 3

gas ——> liquid

Answer 3

condensation

Question 4

liquid ——> gas

Answer 4

evaporation

Question 5

solid ———> liquid

Answer 5

melting

Question 6

liquid ——> solid

Answer 6

freezing

Question 7

Are CH bonds polar or nonpolar?

Answer 7

nonpolar

Question 8

In regards to intermolecular forces, the stronger the force, the _________ the boiling point and the ________ the melting point.

Answer 8

higher; higher

the stronger the force, the less volatile the matter is

Question 9

Hydrophilic molecules _____ water.

Answer 9

like

Hydrophilic molecules are also lipophobic

Question 10

Hydrophobic molecules _____ water

Answer 10

fear Hydrophobic molecules are also lipophilic

Question 11

C02 has ______ molecular geometry.

Answer 11

linear

Question 12

T or F: CO2 is polar.

Answer 12

False, CO2 is nonpolar

Question 13

T or F: N2O is a polar molecule.

Answer 13

True.

Question 14

Does N2O have bent or linear geometry?

Answer 14

linear

Question 15

Define surface tension.

Answer 15

When a liquid has a high enough attractive force with itself, and a low enough force with the surface, it will exhibit high “surface tension.”

Question 16

In regards to capillary action, describe cohesion vs adhesion.

Answer 16

Cohesion creates surface tension while adhesion attracts the liquid to the wall of the container. Adhesion > Cohesion

Question 17

Greater intermolecular forces result in a _____ volatile liquid and ______ vapor pressure.

Answer 17

less; lower

Question 18

Does vapor pressure increase or decrease with increasing temperatures?

Answer 18

Vapor pressure INCREASES with increasing temperature.

Question 19

The boiling point of a liquid happens when the vapor pressure is equal to the….

Answer 19

atmospheric pressure (or the pressure it is exposed to, can vary with location)

Question 20

Define heat of fusion.

Answer 20

Energy required to melt a mole of a material

Equation given, no temp in equation.

Question 21

Define heat of vaporization.

Answer 21

Energy required to boil a mole of a material.

Equation given, no temp in equation.

Question 22

True of False: heat of vaporization < heat of fusion.

Answer 22

False.

Heat of vaporization is ALWAYS > heat of fusion for all substances

Question 23

Amount of energy required to change the temperature of a substance.

Answer 23

Specific heat

Question 24

Specific heat of water

Answer 24

1 cal/g/°C or 4.18 J/g/°C (because 1 cal = 4.18 J)

(it takes 1 calorie to raise the temperature of 1 g, 1°C)

Question 25

Specific heat of ice

Answer 25

2.11 J/g/°C

Question 26

Specific heat of steam

Answer 26

2.08 J/g/°C

Question 27

List the three properties of a supercritical fluid

Answer 27

1. flow properties of a gas
2. density similar to liquid
3. no surface tension