<![CDATA[Student Doctor Network Forums - MCAT Study Question Q&A]]> http://forums.studentdoctor.net/ Subforum specifically for asking questions when studying for the MCAT. Please no actual MCAT questions. en Wed, 22 May 2013 21:00:10 GMT vBulletin 20 http://dkmg2azsloi0e.cloudfront.net/images/misc/rss.jpg <![CDATA[Student Doctor Network Forums - MCAT Study Question Q&A]]> http://forums.studentdoctor.net/ <![CDATA[Poiseuille's Law Blood Vessel]]> http://forums.studentdoctor.net/showthread.php?t=1006888&goto=newpost Wed, 22 May 2013 20:19:47 GMT The diameter of a uniform blood vessel is reduced by a factor of 2 , the resistance of this blood vessel increases by a factor of?

The answer is 16 using Poiseuille's Law. Easy to see this based on the equation.

Does this mean in Poiseuille's Law the Flow is constant? How does this relate to the body? Your not losing blood so does this make the flow rate constant? Having trouble grasping conceptually. ]]> Maverick56 http://forums.studentdoctor.net/showthread.php?t=1006888 Question about Chemical Equilibrium... from Berkley Review http://forums.studentdoctor.net/showthread.php?t=1006886&goto=newpost Wed, 22 May 2013 20:12:58 GMT So I am going over the Equilibrium chapter in TBR... it is probably an older edition but I heard that the TBR books haven;t changed that much with the exception of the Organic Chemistry book. Anyways, Chemical Equilibrium is a ratio right...... So I am going over the Equilibrium chapter in TBR... it is probably an older edition but I heard that the TBR books haven;t changed that much with the exception of the Organic Chemistry book.

Anyways, Chemical Equilibrium is a ratio right... [products]/[reactants]=K

so say that K=2 for A + B---> C

[C]=2, [A]=1, [B}=1... this works out

[C]=8, [A]=2, [B]=2... also works out

also [C]=8, [A]=1, [B]=4... works out too???

So as long as the concentrations satisfy the ratio determined by the equilibrium conditions at the set temperature is everything okay??? It seems weird that you can just change the concentrations to satisfy the equilibrium ratio.

Also, I was previously studying with EK and they did not go into as much detail as TBR... TBR has a lot of math too... is that good? Should I do the practice tests at the end of the chapter timed? 8 minutes per passage?

Thank you for all your help! ]]> tinylilron http://forums.studentdoctor.net/showthread.php?t=1006886 BR Gen Chem Chapter 3 Passage X Q.65 http://forums.studentdoctor.net/showthread.php?t=1006827&goto=newpost Wed, 22 May 2013 16:56:04 GMT Hello,

the question ask "in which solution is Ag2S MOST soluble?"
A. 0.10 M Ag+
B. 0.01M Ag+
C. 0.10M S2-
D. 0.01M S2-

i know that we first need to eliminate A and C because they have higher conc of the common ion, but how do you distinguish whether Ag+ or S2- has a bigger impact on Ag2S solubility? :confused:

Thank you ]]> jjunior http://forums.studentdoctor.net/showthread.php?t=1006827 question with kidney function (loop of henle) http://forums.studentdoctor.net/showthread.php?t=1006676&goto=newpost Wed, 22 May 2013 00:31:11 GMT I thought the point of the loop of henle was to concentrate the filtrate. this is because Na/Cl are pumped out and water follows. so the concentration of other solutes increases.

this picture from my A&P textbook is confusing me though. at the bottom of the loop it shows the filtrate is highly concentrated, which makes sense. however as it goes back up the ascending portion the concentration falls, eventually to even lower than when it first entered the loop (100 vs 300). the way im looking at this picture it seems like the loop isn't really concentrating? i don't understand
Attached Images
File Type: jpg kidneyloop.JPG (38.9 KB)
]]> yoyohomieg5432 http://forums.studentdoctor.net/showthread.php?t=1006676 TBR Translational Motion Practice Exam #17 http://forums.studentdoctor.net/showthread.php?t=1006671&goto=newpost Wed, 22 May 2013 00:12:50 GMT The question asks: For Experiment 3, when measuring the acceleration, the students found that: A. the larger the mass of the air cart, the larger the acceleration. B. the larger the mass of the air cart, the smaller the acceleration. C. the... The question asks:
For Experiment 3, when measuring the acceleration, the students found that:
A. the larger the mass of the air cart, the larger the acceleration.
B. the larger the mass of the air cart, the smaller the acceleration.
C. the larger the mass of the air cart, the longer the travel time.
D. the mass of the air cart and the acceleration are unrelated.

Background Info:
In order to study the relationships between speed, velocity and acceleration, a group of students perform a set of experiments using air carts of various masses, a long air, track and photogates. Neglect friction in the following experiments:
Experiment 3
The track is kept at the same angle as in Experiment 1. Air carts of different masses are given the same initial velocity. Total transit times and distances traveled are measured.

The answer is D and the book explains that speed, velocity, and acceleration are unrelated to mass, but what about F=ma? Wouldn't the acceleration have a greater magnitude? It says to neglect friction...is that why the mass & acceleration are unrelated? ]]> AngelStorm91 http://forums.studentdoctor.net/showthread.php?t=1006671 organic self assessment some out of scope? http://forums.studentdoctor.net/showthread.php?t=1006649&goto=newpost Tue, 21 May 2013 22:30:54 GMT Hey to anyone who's done the organic self-assessment,


Are there questions that are no longer covered on the MCAT? For example, I came across diels alder and hydroboration oxidation/oximercuration reactions in the self-assessment...which I could not find on the organic chemistry content outline (alkenes are no longer tested I'm sure of)...any insights? The chemistry is not that bad, but I don't want to waste time on things that definitely won't be on the MCAT. Are these questions from older AAMCS that were retired? My only concern is the self-assessments were released last year so shouldn't they have taken them out if they were no longer pertinent to the exam? ]]> dudewheresmymd http://forums.studentdoctor.net/showthread.php?t=1006649