Choice A: This choice can be tossed out, because the author has changed laws midway through the explanation. The phrase "gains more CO2 molecules" refers to Avogadro's law, and not Boyle's law, so using MCAT logic, this answer should be tossed out because it is factually incorrect. Answers that make logical sense but have mis-information can be incredibly tempting. This is an excellent wrong answer choice.So, using your arsenal of GEN Chem and Physics conceptual knowledge, Why does a bubble grow and move faster as it ascends to the top?
- A) Boyle's Law. Pressure of a gas is inversely proportional
to volume. Thus, when a bubble gains more CO2 molecules
it gains in volume, and thus decreases pressure. Pressure
equilibates to the top since top of the glass has a lower
pressure than at the bottom of the glass. Therefore,
sum of the net forces move it up.
B) Density. density of CO2 gas is lighter than Beer thus it rises
to the top.
C) Archimedes Principle. The bubble at the bottom of the glass
acts as a nucleation site, thus CO2 accumulates. As the bubble
grows bigger, it displaces more surrounding fluid. Therefore,
buoyancy increases and this net force moves it up.
D) Bernoullli's equation. P + 1/2 pv2 + pgy= constant. Since,
pressure is highest at the bottom of the glass, the velocity
of the gas molecules must be lower at the bottom of the
glass, therefore it rises to the top.
Frugal? I don't even get those when I'm feeling rich. On a big-spender day, you can put me down for a MGD. Otherwise, it's a six-pack of plainwrap.Originally posted by chandler742
If you are frugal, Tequiza or Sam Adams hits the spot...
Can't wait to hear the results! Keep us postedOriginally posted by Pinki
Anyway, I'm taking a new, never before seen test tomorrow morning. I'll report back if the technique showed similar, (i.e. above 8!) results.
This thread is 9 to 11 years old. With the way the current MCAT is set up, I highly doubt it would help your score. You may see an increase in like AAMC 3-6, but not on the higher numbered ones and especially not on the real dealWow, is this real still? The thread is so old, but I thought that I would resurrect it. I too am having a lot of trouble with timing on the PS section.
Does anyone do this or has anyone tried it recently? Does it really help?
Should I try it?
yup this thread is still valid today. i've done this, and highly recommend NOT reading the passage--there's no reason to. just look at the question, usually it points you to the paragraph/experiment number in the passage anyway so just focus on that one part of the passage. for the most part you don't really need to read the whole thing to answer the questions and do well in it (look at bolded part)DO NOT READ THE PHYSICAL SCIENCE PASSAGES. The most annoying problem I ran into while studying for the MCAT was not having enough time to complete sections. This happened most frequently for Physical Sciences because the passages are so dense and there's just too much information to keep tabs on. One of the techniques championed by a prep course I took was to read the questions first to get an idea of what's important, and then go to the passage and find those points. I started doing that but found that the questions offered enough information to give me a clue as to how I should best answer. I ended up never reading the passages to answer the questions, saving about 15-20 minutes, and reading the passages for entertainment purposes only.
i am gonna have to give this a shot. i always have trouble finishing and end up guessing on the last passages.I am reporting my experience as I just spent 3 hours reviewing the answers and analyzing results.
I attempted to take Kaplan's PS Section Test #1 this morning WITHOUT READING PASSAGES BEFOREHAND. I got a 55.77% The problem now is that I cant tell if this is an improvement because I dont know what I would have gotten if I had read the passages and the score is not scaled. The section tests seem much more difficult than the Full Lengths or the AAMC exams.
Interestingly: I am notmally guessing on 1 full passage because I run out of time. This time, I had about 2:30 left at the end of finishing all questions. I finally got to give all the questions a fair shot and didnt feel incredibly rushed the entire time. Also, I just reviewed the answers and it doesnt appear that I missed many questions due to not having read the passage (maybe 1 or 2 of them). Most of them were just due to not knowing the answer... the passages were tough.
Can anyone out there in the ether give me some meaning to my score? 55.77%? What is your Full length PS section average scaled score and what did you get when you took PS Section Test #1? Any meaning would be good. My friend who I study with and who usually gets around the same or even a little better than me on the PS section took the test as well and for a 35% or something... but I am not sure if that is just a fluke. What do you guys think?
Anyways, since this test FELT significantly better than ever before, I think that I will try to take a full length without reading the PS passages beforehand.
Overall, I think that there may be some validity to this method if you are struggling with time int he PS section. I was able to answer all of the questions just as well by simply skimming through the passage for the information requested by the question stem.
Comments? Does anyone even care? lol