First Exam

Question 1

does the solubility of gases in water increase as the temperature increases?

Answer 1

nope

Question 2

is the enthalpy change of a solution for ionic compounds always exothermic?

Answer 2

nope

Question 3

Does the freezing point of a solution increase as the concentration of solute increases?

Answer 3

nope

Question 4

what does the kinetic molecular theory assume about gases?

Answer 4

1. they have a small volume
2. they don’t interact with other gas molecules
3. move randomly and constantly
4. engage in elastic collisions
5. average kinetic energy is equal to absolute temp

Question 5

which way does gas leak when it effuses?

Answer 5

from a high pressure area to a low pressure area

Question 6

atm to Pa

Answer 6

1 atm=101.325Pa (multiply)

Question 7

atm to mmHg

Answer 7

1 atm=760mmHg

Question 8

does one torr equal one mmHg?

Answer 8

hek ya

Question 9

atm to bars

Answer 9

1 atm=1.01325 bars

Question 10

density of a gas

Answer 10

MP/RT

Question 11

how does molar mass affect density

Answer 11

low molar mass means low density

Question 12

how to find partial pressure

Answer 12

mole fraction times total pressure

Question 13

what affects gas solubilities?

Answer 13

temperature and pressure

Question 14

when pressure increases how does it affect solubility?

Answer 14

makes it increase

Question 15

when temperature increases how does it affect solubility?

Answer 15

makes it decrease

Question 16

what does Henry’s law mean?

Answer 16

the relationship between solubility of a gas and its partial pressure

Question 17

what affects vapor pressure?

Answer 17

temp, surface area, intermolecular area and solute

Question 18

colligative properties are dependent on…

Answer 18

concentration of solute not identity

Question 19

what does molality apply to

Answer 19

solute not solvent

Question 20

steps to find molar mass using a colligative property

Answer 20

1. find molality
2. find number of moles
3. molar mass=mass/n

Question 21

can gas be soluble in water if the gas is non polar?

Answer 21

yes

Question 22

the pressure of a gas is inversely proportional to its temperature in kelvin (at constant volume and moles)
T/F?

Answer 22

false

Question 23

kinetic molecular theory

Answer 23

explains the behavior of gases based off of the motion of their particles

Question 24

at STP, 1 mol of gas has a volume of….

Answer 24

22.4L

Question 25

what is the vapor pressure at a liquids normal boiling point?

Answer 25

1 atm

Question 26

when is a liquid more volatile?

Answer 26

when it has a higher vapor pressure

Question 27

why are theoretical and experimental values of van’t Hoffs factor different?

Answer 27

the cations and anions cluster together

causes fbd and bpe to be less than predicted