answer the question...then ask another one

[sdnstud]

---

Members do not see this ad.

aite...let's review for the mcat...answer the question...then ask your question:

Boiling of liquid X occurs when the vapor pressure of liquid X equals atmospheric pressure. Evaporation occurs when the vapor pressure of liquid X is:

A. equal to atmospheric pressure
B. lower than atmospheric pressure
C. equal to the partial pressure of gas X
D. lower than partial pressure gas X

 

[shaq786]

I want to say B....but I dont know lol.

 

[MDtoBe777]

Is it B? I don't know either. I do know that the vapor pressure of a liquid can never exceed the vapor pressure of the atmosphere though. What is the right answer?

 

[Direct Laryngoscopy]

it's not a? 😕

 

[VPDcurt]

I would guess A.

 

[shaq786]

I'm stuck between B and C now

Whats the answer?????????

 

[DieselPetrolGrl]

a guess for C

 

[FrogE7]

i thought it was A.

 

[danimastani]

I would say A because evaporation is same as boiling.

 

[Doctor Bagel]

my totally uneducated guess is B because evaporation starts before boiling, so it starts before the vapor pressure equals the atmospheric pressure.

 

[sdnstud]

aite...let's review for the mcat...answer the question...then ask your question:

Boiling of liquid X occurs when the vapor pressure of liquid X equals atmospheric pressure. Evaporation occurs when the vapor pressure of liquid X is:

A. equal to atmospheric pressure
B. lower than atmospheric pressure
C. equal to the partial pressure of gas X
D. lower than partial pressure gas X

The answer is C.
boiling is the eqilibrium beween liquid and gas. evaporation is the process of turning liquid to gas. since boiling is when vapor pressure of X equals the atm pressure, the vapor pressure must be greater than the atm pressure during evaporation. A, B and D are out. C is the correct answer. since atm pressure consist of the partial pressure of numerous gases.....the partial pressure of gas X (which is one of hte numerous gases contributing to the atm pressure) must be smaller than the atm pressure....therefore C.

 

[Doctor Bagel]

wait, doesn't vapor pressure increase with evaporation until you reach the boiling point? i know that the vapor pressure does not equal atmospheric pressure when a liquid's not boiling, but i guess i'm not getting why the vapor pressure is greater than the atmospheric pressure.

 

[DieselPetrolGrl]

omg i was right
WHERE IS MY COOKIE
WHERE IS IT!!!! GIVEE MEEE MY COOKIE
* THRUSTS PELVIS WILDLY*

 

[shaq786]

Ok can someone clarify this hypothetical example?

Lets say you have a volatile fluid at 1 atm and you let it sit and allow the molecules to escape the solution. Now lets say you move this fluid over to a 100 atm pressure environment. DO LESS MOLECULES LEAVE THE SOLUTION BECAUSE THE PRESSURE IS NOW GREATOR????

If so then, IS THERE A CERTAIN PRESSURE FOR WHICH NO MOLECULES CAN ESCAPE THE SOLUTION??????????????????

 

[sdnstud]

since i answered the last question...im gonna ask another one:

which of the following is hte strongest type of bonds in a glass of pure water
1. covalent bond
2. Hydrogen bond
3. dipole dipole
4. London force

 

[DieselPetrolGrl]

since i answered the last question...im gonna ask another one:

which of the following is hte strongest type of bonds in a glass of pure water
1. covalent bond
2. Hydrogen bond
3. dipole dipole
4. London force

um ...i got it right so i deserve to ask the q....ur mean!

BAH


u asked a trick question hygrogen is the strongers intermolecular and covalent is the strongest intra molecular so are we talking about bonds within or in between the water molecules? hrrrmmmm???????

 

[DieselPetrolGrl]

wait, doesn't vapor pressure increase with evaporation until you reach the boiling point? i know that the vapor pressure does not equal atmospheric pressure when a liquid's not boiling, but i guess i'm not getting why the vapor pressure is greater than the atmospheric pressure.

yes bc the pressure is cramming them bk into the liquid state
i thinkey so

 

[sdnstud]

strongest bond period...intramolecular or intermolecular

um ...i got it right so i deserve to ask the q....ur mean!

BAH


u asked a trick question hygrogen is the strongers intermolecular and covalent is the strongest intra molecular so are we talking about bonds within or in between the water molecules? hrrrmmmm???????

 

[javandane]

since i answered the last question...im gonna ask another one:

which of the following is hte strongest type of bonds in a glass of pure water
1. covalent bond
2. Hydrogen bond
3. dipole dipole
4. London force

answer is 1. intramolecular covalent bonds between H and O. now, my question:

the production of what enzyme will be noticably increased approximately 15 minutes after completion of saturday's mcat?

a. alcohol dehydrogenase
b. alcohol dehydrogenase
c. alcohol dehydrogenase
d. alcohol dehydrogenase

 

[DieselPetrolGrl]

ok then covalent but ur still an rather mean chap
post another Q

 

[joelmamchur]

answer is 1. intramolecular covalent bonds between H and O. now, my question:

the production of what enzyme will be noticably increased approximately 15 minutes after completion of saturday's mcat?

a. alcohol dehydrogenase
b. alcohol dehydrogenase
c. alcohol dehydrogenase
d. alcohol dehydrogenase

If only the MCAT was that easy.... 🙁