kinetics vs thermodynamics
I came across a couple of questions in a full length BS section that ask which compunds in a given set of experiments are "the product of kinetic control" and which is "the product of thermodynamic...
View ArticleGlycosidic bond in sucrose; why B-fructose?
I'm having trouble understanding how the bond in sucrose is beta on carbon 2. Is it flipped over or something? It looks like the fructose is turned over from its traditional "textbook image"
View ArticlePressure Q
View attachment 200076 I drew this out like such - are they saying that at any point along either of the tubes, the pressure will be 0.05? View attachment 200077 If the height of the two tanks were...
View ArticleWhy is Iron stronger than Gold?
My little brother asked me and I can't seem to come up with an explanation. Any thoughts?
View ArticlenAChR (Nicotinic AcH receptors)
I'm kind of boggled right now with my EK Bio2 lecture 2 exam. There's a passage with a study that says that "nicotinic acetylcholine receptors (nAChr) causes the hyperpolarization" then theres a...
View ArticleRate and temperature calculation problem
I having trouble with this question and the answer provided is not helping me either. If the rate of a certain reaction is increased by a factor of 10, the temperature increase is 3 degrees Celcius....
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Blaughable's MCAT study Questions
Instead of making a new thread here everytime I come up with a question, I thought that I'd just make a thread to put all my questions in. (Hope it's okay ) 1.) Chapter 1 of TBR - Organic Chemistry....
View ArticlePhosphate Groups
I know this question has been asked before, but why are most phosphate groups dissociated on all oxygens in biological molecules, such as for AMP? I looked up the pkas for phosphoric acid, pka3 is...
View ArticleNADH as GNG and Glycolysis regulator
Hello, Can anyone explain how NADH regulates gluconeogenesis? TPR online exam solution states that NADH inhibits GNG because of reduction in concentration of pyruvate and OAA needed to produce glucose...
View ArticleExamkrackers Chemistry - Imine/Enamine formation
I'm currently reading the Examkrackers 2015 Chemistry book(page. 100) and the mechanism for imine/enamine formation begins with the amine attacking the carbonyl carbon of the aldehyde/ketone as the...
View ArticleSection Bank, Physical Sci #25
Can someone help me understand why option B is not the correct answer for #25 in the Physical Science section of the official Section Bank? Thanks in advance!
View Articlepsych question: extinction burst
This is a question from a Khan resource. An aggressive cat is given treats when it "plays nicely" to reinforce less aggressive behavior. When treats are not given anymore, the cat acts even more...
View ArticleTriple Point
Is there any phase change actually happening at the triple point? I know that the three phases solid, liquid and gas exist in equilibrium at this point - does that mean that all possible types of phase...
View Article"pKw = pKa + pKb" formula explanation
Hi guys, This may be a silly question, but I'm confused about the formula pKw=pKa+pKb (and I guess by extension Kw=Ka*Kb). My confusion came from an Examkrackers question asking "What is the pKb for...
View ArticleDielectrics and dipoles
Hello all, I'm a bit confused on why dielectrics do what they do. I know that when the electric field of a capacitor exists, the dipoles of a dielectric orient themselves in the direction of the...
View ArticleAlpha Decay
1. Under what conditions would alpha decay happen since it is not as efficient at replacing the protons:neutrons ratio? 2. By how much does the number of neutrons decrease? I was thinking 2 neutrons...
View ArticleEnzymes/Terminology
I just want to clarify a few points. Since the enzyme structure is slightly altered as it makes partial bonds with the substrate (of course the enzyme is changed back to its normal state at the end of...
View ArticlePore and Charge Question
I was doing a TBR where the question stated that the pore distinguished by size and charge. I was wondering why is it that a larger charge would get through a pore slower? I know that's what happens...
View ArticleReaction rate graphs
I am trying to practice more with graphs since that is my weakness. So for the reaction rate versus time graph (below). I know that Rate = -[Substrate]/time [substrate] = rate x time Is it correct to...
View ArticlePhysics force question
Is there another way of solving this problem instead of using Impulse/momentum? View attachment 200317
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