II Exam 1

Question 1

phase change: solid to liquid

Answer 1

melting

Question 2

phase change: liquid to solid

Answer 2

freezing

Question 3

phase change: liquid to gas

Answer 3

vaporization

Question 4

phase change: gas to liquid

Answer 4

condensation

Question 5

phase change: solid to gas

Answer 5

sublimation

Question 6

phase change: gas to solid

Answer 6

deposition

Question 7

vaporization
– if you increase temp, what happens to kinetic energy?

Answer 7

KE increases

Question 8

vaporization
– if you increase intermolecular forces, what happens to kinetic energy?

Answer 8

greater KE needed for molecule to escape surface

Question 9

if you have stronger cohesion forces, what happens to vapor pressure?

Answer 9

lower vapor pressure

Question 10

if you have weaker cohesion forces, what happens to vapor pressure?

Answer 10

higher vapor pressure

Question 11

relationship between temperature and vapor pressure

Answer 11

proportional

Question 12

relationship between boiling point and vapor pressure

Answer 12

inversely proportional

Question 13

relationship between boiling point, cohesion forces, and vapor pressure

Answer 13

the higher the boiling point, the stronger cohesion forces will be, and the lower the vapor pressure will be

Question 14

during a phase change, is there an increase in temperature?

Answer 14

no

Question 15

phase change diagrams
– at high temp and lower pressure, what is the phase?

Answer 15

gas

Question 16

phase change diagrams
– at low temp and higher pressure, what is the phase

Answer 16

solid

Question 17

intermolecular forces
– does a larger charge increase or decrease attraction?

Answer 17

increase
*relative to the bonding forces among atoms

Question 18

intermolecular forces
– does a longer distance increase or decrease attraction?

Answer 18

decrease
*relative to the bonding forces among atoms

Question 19

dispersion forces

Answer 19

• weakest intermolecular force
• present in all atoms and all molecules

Question 20

dipole-dipole

Answer 20

intermolecular force present in polar molecules
- only exist in a picture (not a pure substance)

Question 21

hydrogen bonding

Answer 21

intermolecular force in molecules containing H bonded to F, O, or N

Question 22

ion dipole

Answer 22

a full change, either positive or negative
- charge is a greater factor than size when determining the strength

Question 23

if we increase mass, does intermolecular forces increase or decrease?

Answer 23

increases

Question 24

body-centered atom in 1 unit cell

Answer 24

1 atom

Question 25

corner atom in 1 unit cell

Answer 25

1/8th of an atom

Question 26

face-centered atom in 1 unit cell

Answer 26

1/2th of an atom

Question 27

how many atoms does a simple cubic cell have?

Answer 27

8 atoms on corners = 1 atom

Question 28

how many atoms does a body-centered cubic (bcc) cell have?

Answer 28

8 atoms on corners and 1 in center = 2 atoms

Question 29

how many atoms does a face-centered cubic cell have (bcc)

Answer 29

8 on corners, 6 on faces = 4 atoms

Question 30

solvent

Answer 30

the component of a solution found in a higher volume

Question 31

solute

Answer 31

the component of a solution found in a lower volume