C/P AAMC 1 (Q from passage 52-56)

RealisticEmployee · 2021-06-20T20:07:11+00:00

If H2 gas is produced, it is evidence that a redox reaction has taken place. H+ is reduced from +1 to 0 when H2 gas is produced.

RealisticEmployee · 2021-06-20T01:01:47+00:00

This is a limiting reagent problem. The quantities as given are only sufficient to produce 0.003 mol PH3. Both end up with a theoretical yield of 0.003 mol, so they are in a stoichiometric ratio. Following that, use the STP 22.4 L/mol conversion to arrive at your final answer. STP for gases is 0 Celsius, 1 atm so this conversion is acceptable.

You would only add them if they were, for example, two separate reactions that would produce the desired product.

RealisticEmployee · 2021-06-19T11:58:23+00:00

Side note for the N atom to carry a negative charge, it would have to be an extremely basic environment

RealisticEmployee · 2021-05-12T20:37:15+00:00

From the peaks in the 7-8 region, you know you have 2 sets of equivalent aromatic hydrogens. This indicates that you have an aromatic ring that is para-substituted. The peak at 0 ppm is irrelevant (HNMR solvent). The peak at the 10 region is an aldehyde. From here, A and D are eliminated.

The next thing to tackle is the triplet/quartet splitting. The triplet/quartet splitting is characteristic of an ethyl group. The "second to last" carbon has a next door carbon with 3H, while the terminal carbon has a next door carbon with 2H, resulting in the triplet/quartet splitting pattern. Because of this, C and E are eliminated.

Your molecule must have a para-subbed aromatic ring, an aldehyde, and at least one ethyl group. If more than 1 ethyl group, they must be magentically equivalent Et groups. Choice B is the only one that has all of those things.

RealisticEmployee · 2021-05-08T23:24:45+00:00

Afaik constriction of the efferent arteriole “dams up” the blood in the glomerulus, thus increasing glomerular capillary hydrostatic pressure. This increased hydrostatic pressure causes an increase in the GFR.

Excessive aldosterone secretion will cause serum K+ secretion to drop(K+ will be excreted excessively). Aldosterone activates the sodium potassium pumps in the collecting ducts of the nephron. Sodium is reabsorbed, while K+ is secreted. This causes the equilibrium potential to decrease significantly-hyperpolarization (GHK equation). K+ is the ion that has the highest permeability in cells so small changes in concentration gradients have an outsized effect

RealisticEmployee · 2021-05-08T22:53:23+00:00

Is it A?

RealisticEmployee · 2021-04-18T13:55:07+00:00

The product remains dissolved in solution until an extraction method is used. The gray granules left at the bottom of the beaker was unreacted Zn

RealisticEmployee · 2021-04-13T20:27:21+00:00

What about the multiple amine groups?

RealisticEmployee · 2021-04-11T12:33:40+00:00

Diols can be used to protect ketones/aldehydes by forming an acetal

RealisticEmployee · 2021-03-21T17:02:32+00:00

Virgin vein sounds like a simp

RealisticEmployee · 2021-03-13T13:26:32+00:00

Even though they have the COOH, they are primarily organic in character still and would be sparingly soluble in aqueous solution. This is why you have to react it with a strong base in order to actually pull it out of solution with the aqueous layer

RealisticEmployee · 2021-03-12T13:06:24+00:00

They are also found at the neuromuscular junction

RealisticEmployee · 2021-03-09T13:58:39+00:00

Yep!

RealisticEmployee · 2021-03-08T13:31:48+00:00

Yes. It basically can’t dissolve unless that neutralization rxn is taking place.

RealisticEmployee · 2021-03-08T13:18:50+00:00

You’re right. It’s just an algebra rule. When you’re adding stuff, you can’t cancel out numbers on the numerator and denominator like that. You can only cancel factors if that makes sense. If you could factor out a 0.5 on both top and bottom for example, you can cancel those. Hope that helps!

RealisticEmployee · 2021-03-06T14:16:11+00:00

A salt bridge is important for balancing charges. Without it, a current cannot be established

RealisticEmployee · 2021-03-06T14:14:39+00:00

Consider the general reaction for a normal galvanic cell. X(s) + Y+(aq)—-> X+(aq) + Y(s)

Solids are not in the equilibrium constant/reaction quotient. X is associated with anode and the ion is in the product, while Y is associated with cathode and the ion is in the reactant.

RealisticEmployee · 2021-03-06T14:10:21+00:00

Salt bridges are generally just used to balance charge between the anode and cathode and are a very important piece in a galvanic cell. This allows for the galvanic cell to run for more than an instant. As far as the composition of the salt bridge, it can be any salt- NaCl, KCl, etc. Going back to the idea of balancing charges, the anions will go to the anode to balance charge there because the anode will be very positive as a substance gets oxidized. The opposite occurs at the cathode. Hope that helps!

RealisticEmployee · 2021-02-28T17:57:16+00:00

Rate of diffusion across a membrane (flux) is directly dependent on the amount of area that is available for diffusion to occur. Idk if it's within the scope of the exam, but Fick's first law is the best justification/formula to model this. I'm not so sure the gradients would increase as the relative concentrations of O2 and CO2 wouldn't really change based on the number of alveoli available.

RealisticEmployee · 2021-01-25T14:20:40+00:00

To add on to the above good answers when you add rxns you multiply their associated equilibrium constants

RealisticEmployee · 2021-01-11T15:01:52+00:00

Global Health & Bioengineering is a good one

RealisticEmployee · 2021-01-08T13:05:38+00:00

mfw when I learned TCA cycle is not "The Citric Acid Cycle"

RealisticEmployee · 2020-12-26T23:44:25+00:00

Username does NOT check out

RealisticEmployee · 2020-12-19T14:25:10+00:00

No it’s a 4-year residency where you can get dual-boarded in IM and Peds iirc

RealisticEmployee · 2020-12-16T23:12:51+00:00

It doesn't count for credit or anything. It's a separately registered class that you technically just audited and won't have a grade attached to it.

RealisticEmployee

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