Solubility, fatty acids, and uranium are all topics of the three discrete questions we cover on this next installment of Next Step full-length 10 breakdown!
This is our last set of discrete questions before we move on to our next section. As always, we’re joined by Bryan Schnedeker of Blueprint MCAT (formerly Next Step Test Prep).
The addition of which of the following compounds to water would reduce the solubility of ferrous hydroxide?
Bryan’s Insights:
There are three scientific principles to remember.
Both eukaryotes and prokaryotes possess desaturases which can increase membrane fluidity by adding a cis double bond to a fatty acid chain on a phospholipid. What’s the primary intermolecular force acting between adjacent fatty acid chains in a cell membrane?
Bryan’s Insights:
It says intermolecular force so you can eliminate covalent bonding since it’s an intramolecular force. Fatty acid chains are just big long chains of hydrocarbons. It means the only intermolecular force that predominates for them is London dispersion.
Hydrogen bonding requires hydrogen bonds to be bonded to fluorine, oxygen, or nitrogen. None of which is true in the tail part of the fatty acid chain. And dipole-dipole interactions require actual dipoles.
Naturally mined Uranium consists of two isotopes U-235 and U-238. U-238 is more stable than U-235 and cannot be used for nuclear energy. An industrial enrichment process increases the abundance of U-235 from 0.9% to 3.7% in a 500-gram sample of Uranium. How many additional moles of U-235 are yielded as a result?
Bryan’s Insights:
So there are two steps here. Take that percentage increase on the 500-gram sample and then divide the grams by molecular weight to get moles.
Doing some math, 500g times 2.8% (3.7-0.9) is 14 grams and converting this to moles (14/235) and the answer is B.
You can also do rounding off just to make the math easier. But you also want to round something where you can reduce the fraction. Then try to round so that the denominator of the fraction gets as close as you can to either 100 or 50 or 25. Something you can just scale to 100 to make it a percent. This is a very common technique for manipulating fractions without a calculator on test day.
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Just wanted to share my wonderful news! I received my first medical school acceptance! Thank you for all that you do for us Application Academy!!!
I am excited to tell you that I just got my third interview invite from XXXXX today! I can’t believe it. I didn’t even know if I was good enough to get one, let alone three – by mid-September. Thank you so much for all of your help and support up to this point; I would not be in this position without it!!
I wanted to thank you for helping me prepare for my XXXXX interview. Even in a 30-minute advising session, I learned so much from you. Thank you for believing in me, and here’s to another potential success story from one of your advisees!
I just received an acceptance with XXXXX! This is so exciting and such a huge relief and so nice to have one of our top choice schools! I also received an interview with XXXXX which brings the total up to 20 interviews! Thank so much, none of this would have been possible without you!
I just received my admission to XXXXX! This is unreal and almost feels like I am dreaming. I want to thank you for all of your help with my application. I cannot overstate how influential your guidance and insight have been with this result and I am eternally grateful for your support!
IM SO HAPPY!!!! THANK YOU SO MUCH FOR ALL YOUR HELP, IM INDEBTED TO YOU! Truly, thank you so much for all your help. Thank you doesnt do enough.
I want to take a few moments and thank you for all of your very instructive, kind and consistent feedback and support through my applications and it is your wishes, feedback, and most importantly your blessings that have landed me the acceptance!
I got into XXXXX this morning!!!! It still has not hit me that I will be a doctor now!! Thank you for all your help, your words and motivation have brought me to this point.
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