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Chem 106 > First Exam > Flashcards

First Exam Flashcards

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1
Q

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

A

nope

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2
Q

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

A

nope

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3
Q

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

A

nope

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4
Q

what does the kinetic molecular theory assume about gases?

A
  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
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5
Q

which way does gas leak when it effuses?

A

from a high pressure area to a low pressure area

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6
Q

atm to Pa

A

1 atm=101.325Pa (multiply)

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7
Q

atm to mmHg

A

1 atm=760mmHg

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8
Q

does one torr equal one mmHg?

A

hek ya

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9
Q

atm to bars

A

1 atm=1.01325 bars

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10
Q

density of a gas

A

MP/RT

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11
Q

how does molar mass affect density

A

low molar mass means low density

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12
Q

how to find partial pressure

A

mole fraction times total pressure

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13
Q

what affects gas solubilities?

A

temperature and pressure

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14
Q

when pressure increases how does it affect solubility?

A

makes it increase

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15
Q

when temperature increases how does it affect solubility?

A

makes it decrease

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16
Q

what does Henry’s law mean?

A

the relationship between solubility of a gas and its partial pressure

17
Q

what affects vapor pressure?

A

temp, surface area, intermolecular area and solute

18
Q

colligative properties are dependent on…

A

concentration of solute not identity

19
Q

what does molality apply to

A

solute not solvent

20
Q

steps to find molar mass using a colligative property

A
  1. find molality
  2. find number of moles
  3. molar mass=mass/n
21
Q

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

A

yes

22
Q

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

A

false

23
Q

kinetic molecular theory

A

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

24
Q

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

A

22.4L

25
Q

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

A

1 atm

26
Q

when is a liquid more volatile?

A

when it has a higher vapor pressure

27
Q

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

A

the cations and anions cluster together

causes fbd and bpe to be less than predicted

Chem 106 (13 decks)

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