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Leah4sci MCAT
Приєднався 14 тра 2014
MCAT content, strategy, study tips and more, everything you need to prepare for your upcoming Medical College Admissions Exam
How to Draw Fischer Projections
Leah4sci.com/Fischer presents: Introduction to Fischer projections including how to quickly draw and interpret them for molecules with single and multiple chiral centers
📺Watch Next: Fischer Projection Stereochemistry RS Chirality ua-cam.com/video/S7uWtkcaCQc/v-deo.htmlsi=fJDXV-nIl2581lGM
Tired of conflicting and confusing MCAT advice? Access My FREE guide for everything MCAT prep: leah4sci.com/MCATguideYT
In this video you’ll learn all about Fischer projections including what they are, how to read them, how to quickly draw and convert 3D molecules into Fischer projection and back without ever having to build a model kit.
You’ll learn a number of different methods for converting 3D to Fischer from small molecules containing a single chiral center, to complex molecules like D-Glucose containing multiple chiral centers.
You’ll also learn what happens when you rotate a Fischer Projection 90 and 180 degrees.
↪ Additional Links & Resources ↩
▸Fischer Projections Series + Cheat Sheet Leah4sci.com/Fischer
▸Chirality and Stereochemistry Series + Cheat Sheet Leah4sci.com/Chirality
▸How to Use Your Organic Chemistry Model Kit Leah4sci.com/ModelKit
- - - - - - - - - - - - - - - - - - - - - - - -
⏱ In this video:
[0:18] Interpreting Fischer Projections - Mr. Organic Chemistry
[0:56] Drawing Fischer Projections from 3D Structures
[3:09] Rotating Fischer Projections
[4:06] More than One Chiral Center - Example #1
[7:01] More than One Chiral Center - Example #2
[7:58] Turning Fischer Projections into 3D Structures
[9:01] Multiple Chiral Centers - Glucose Example
- - - - - - - - - - - - - - - - - - - - - - - -
Looking for guidance on how to tailor your MCAT Self-Study journey to fit your unique background, experience, and personal goals without feeling alone in the process?
That’s what my new MCAT program is all about, join me here:
leah4sci.com/selfstudyYT
🔔 Subscribe to my channel so you don’t miss out on any new videos 🔔
🩺💉 My MCAT UA-cam Channel: leah4sci.com/MCATyoutube 💉🩺
🧪 My Organic Chemistry UA-cam Channel: leah4sci.com/youtube 🧪
❓Questions? Ask me here: Leah4sci.com/contact
👩🏫 For private online tutoring visit my website: Leah4sci.com/mcat-tutoring/
Let’s connect:▸Instagram: leah4sci
▸Facebook: Leah4Sci
▸X / Twitter: Leah4Sci
▸Pinterest: www.pinterest.com/leah4sci/
📺Watch Next: Fischer Projection Stereochemistry RS Chirality ua-cam.com/video/S7uWtkcaCQc/v-deo.htmlsi=fJDXV-nIl2581lGM
Tired of conflicting and confusing MCAT advice? Access My FREE guide for everything MCAT prep: leah4sci.com/MCATguideYT
In this video you’ll learn all about Fischer projections including what they are, how to read them, how to quickly draw and convert 3D molecules into Fischer projection and back without ever having to build a model kit.
You’ll learn a number of different methods for converting 3D to Fischer from small molecules containing a single chiral center, to complex molecules like D-Glucose containing multiple chiral centers.
You’ll also learn what happens when you rotate a Fischer Projection 90 and 180 degrees.
↪ Additional Links & Resources ↩
▸Fischer Projections Series + Cheat Sheet Leah4sci.com/Fischer
▸Chirality and Stereochemistry Series + Cheat Sheet Leah4sci.com/Chirality
▸How to Use Your Organic Chemistry Model Kit Leah4sci.com/ModelKit
- - - - - - - - - - - - - - - - - - - - - - - -
⏱ In this video:
[0:18] Interpreting Fischer Projections - Mr. Organic Chemistry
[0:56] Drawing Fischer Projections from 3D Structures
[3:09] Rotating Fischer Projections
[4:06] More than One Chiral Center - Example #1
[7:01] More than One Chiral Center - Example #2
[7:58] Turning Fischer Projections into 3D Structures
[9:01] Multiple Chiral Centers - Glucose Example
- - - - - - - - - - - - - - - - - - - - - - - -
Looking for guidance on how to tailor your MCAT Self-Study journey to fit your unique background, experience, and personal goals without feeling alone in the process?
That’s what my new MCAT program is all about, join me here:
leah4sci.com/selfstudyYT
🔔 Subscribe to my channel so you don’t miss out on any new videos 🔔
🩺💉 My MCAT UA-cam Channel: leah4sci.com/MCATyoutube 💉🩺
🧪 My Organic Chemistry UA-cam Channel: leah4sci.com/youtube 🧪
❓Questions? Ask me here: Leah4sci.com/contact
👩🏫 For private online tutoring visit my website: Leah4sci.com/mcat-tutoring/
Let’s connect:▸Instagram: leah4sci
▸Facebook: Leah4Sci
▸X / Twitter: Leah4Sci
▸Pinterest: www.pinterest.com/leah4sci/
Переглядів: 3 439
Відео
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Переглядів 4 тис.3 місяці тому
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Fischer to Haworth shortcut for Glucose and Fructose
Переглядів 6 тис.3 місяці тому
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Переглядів 3 тис.4 місяці тому
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Amino Acid Stereochemistry - R & S vs D & L
Переглядів 4,6 тис.5 місяців тому
Leah4sci.com/aminoacids presents: Amino Acid Stereochemistry from R and S to D and L with a review of ranking priority (Cahn-Ingold-Prelog), Fischer Projections, along with a time-saving MCAT amino acid shortcut 📺Watch Next: How to Draw Fischer Projections ua-cam.com/video/OCfTyNkIt40/v-deo.html Tired of conflicting and confusing MCAT advice? Access My FREE guide for everything MCAT prep: leah4...
Multiplication & Division (No Calculator) Decimal Trick for MCAT Math
Переглядів 8 тис.6 місяців тому
Leah4sci.com/MCATmath presents: Easy MCAT Multiplication and Division of large numbers and decimals without a calculator using the decimal trick 📺Watch Next: MCAT Math Without a Calculator Simplified with Shortcuts ua-cam.com/video/b_1LwWcBb-Q/v-deo.html Tired of conflicting and confusing MCAT advice? Access My FREE guide for everything MCAT prep: leah4sci.com/MCATguideYT This video will walk y...
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just started studying for the mcat and the mental math felt so overwhelming at first, but these videos have been SO helpful and has made it seem less intimidating :) thank you very much!
I never comment on videos, but god this is such a good FREE resource with tips that my paid prep course never taught me. thank you for this.
Wow, thanks so much! I wanted to give students the materials I wanted in college and when studying for the MCAT. Check out leah4sci.com/mcatmath for more
Hey Leah! Just to clarify, when you mentioned 'except for cysteine,' does that imply that for cysteine, the stereochemistry is reversed, meaning D corresponds to L and R corresponds to S?
Tank you mam .the way you taught was really easy to understand
You're very welcome! I'm glad you found it helpful
been struggling with understanding PI for months. This was immensely helpful. Thank you!
You are so welcome, I'm glad to hear that this helped you so much!
Wow this is superb🌟
Thanks a lot 😊so glad you liked it!
I study 8 hours today my focus the size of electrons the speed traveled I am looking for something it keeps drawing me to study. My studies are energies and forces I looking for missed things or I don't know why something is telling me thanks for video everything helps.
you're so welcome, happy to help!
As an Indian, do i have to give the MCAT exam to get into a US pre-medical school??
Pre-medical? If you mean for undergraduate college, no. You would take whatever entrance exam the university requires. The MCAT is needed for medical school.
@@Leah4sciMCAT ohh thank you soo much for replying back, i was confused soo much with that...can you please tell me just one more thing? Is it possible to get into a pre-medical in US from India?
Please how do you know if you should look at the molecule from left side or right side or whether to look from the top or down?
Since molecules rotate in space, it doesn't matter if you look at it from the right or left. Just make sure the perspective lines up with whatever form you're turning it into
Leah Im going to be hearing "A whole lotta tiny is equal to one big or 1 tiny is a tiny tiny portion of that big" and " You cant have One tiny is equal to a whole lot of huge and that just doesn't work " during my MCAT 😂
lol, I'm glad to bring a smile to your face in the middle of the MCAT!
Wow! You answered my question perfectly!! Thank you so much
You're so welcome!
not sure if anyone will see this comment this far in the future but I would love if someone could clarify why we change +2aΔx to -2gΔy. I understand the x to y part but am still confused on the sign change and the change from a to g. anything helps, thanks!
The formula itself is a starting point, however you must also consider that + and - represent direction rather than just addition and subtraction. For example: +Acceleration in the downward direction as we see with gravity, is +(-g) or simply -g If looking at delta Y, the delta tells us final minus initial and so going up vs going down would also be opposite signs
So helpful thank you!
You're so welcome, glad it helped!
Excellent study plan
So glad to hear from you and to help!
Leah4Sci. Wow. You made my organic chemistry journey smooth. Thank you. I only remembered the voice. Thank you
Aww you are so very welcome, I'm glad to hear that I helped you get through orgo! Are you preparing for the MCAT now?
what about with a ketone
What happens to the purple “H” that’s attached to the red “O” that attacks?
Good question! The red "O" becomes deprotonated in solution and loses that purple "H". It is no longer a part of the structure when glucose is drawn as a Haworth projection.
When you say 1 issue as opposed content review what are you referring to?
I am 9 years late but could you please explain how you got the lower part of the atom's configuration to be R and then S because it was going in the left direction so wouldn't it be S ? i got it
When we traced a path from 1 to 2 to 3, we initially got R. Then, we have to remember that group 4 must be towards the back of the molecule in order to assign configuration. So we flip the configuration from R to S to accommodate for Hydrogen being in the front of the molecule. You can learn more about the Swap Method by visiting my full Chirality and Stereochemistry series at Leah4sci.com/Chirality
For the square root question, should we distribute the 1/2 exponent to both the 1 and 10^-6? We do it in the second problem distributing the 2 to both 10^-4 and 9. Thanks!
Yes, you can think of it that way! 1 raised to any exponent is still 1. And then you are left with 10^-6 raised to the 1/2 power. Multiply the exponents and -6 times 1/2 gives you a new exponent of -3.
Thank you so much for these great videos! How do you divide the decimals? I am trying to do the problems on your practice sheets, but I am getting confused.
Division with decimals can be tricky! Make sure you stop and watch my newest video on the decimal trick: ua-cam.com/video/8DKz7Vnq7N8/v-deo.htmlsi=X8XFPhB5sYsjRKmo Then, if you're still having trouble, feel free to reach out to me through my website at Leah4sci.com/contact
thank you sooo mucchhhh, this is the only video i understand after hours and hours trying to understand it 😭😭
I am SO happy to help you understand it quickly and easily!
Thank you so much for all the videos you do. Quick question for you, does Khan academy still have the 300pg PS document? I can’t seem to find it
It's not readily available anymore, but I've been told you can find the link in reddit threads through a google search
I love it! single-handedly saving lives here !!
So happy to help! 🛟
I needed this so bad, thank you Leah! I have been struggling the last few months studying full time for this exam to only have plateau and not improve with my FL exams. I have taken 4 full length AAMC exams and have practiced CARS, went through Kaplan, and did a bit of Anki. I think my issue is trying to do a lot in a little bit and I don’t get the most out of my studying-surface level learning(exposure) is not enough for me, and I recognize that now. I need time and probably have to go about using my resources in a consistent and effective way. You will always be a core part of my college education and journey to becoming a doctor.
I'm so happy this came at the right time for you. It sounds like you have the drive and dedication, and now have a more strategic approach to help you. Email me and let's talk more leah4sci.com/contact
thank you. I really needed this.
You're so welcome!
Wow❤❤❤ im from chile i'm studying nursing i've always accomplished with chemistry, but you saved meee 😭😭😭😭 thank you very much!!!!!
I am so happy to help! Nurses are SO needed worldwide, keep going!
I’m prepping for McAT and the math is just kicking my behind. I’m currently going through your MCAT videos. I am so so grateful for you!
Aww you are so very welcome! Make sure to check out this recent video ua-cam.com/video/b_1LwWcBb-Q/v-deo.html I also have many math resources at leah4sci.com/MCATmath
A very useful video!
Glad you liked it!
True!! I really wish I knew this
Happy to help!
Re 6:26: Would 8.5 be close enough, Leah? I'm using these as my values (I've already memorized them, but I could memorize more specific values if you think it's necessary): Carboxyl: 2 D = 4 E = 4 H = 6 C = 8 Y = 10 K = 11 R = 12 Amino = 9 Thank you!!
8.5 works here! It would actually give you a final answer closer to the correct value. In terms of the MCAT, I usually say 'close enough is good enough'. That small decimal point difference won't distract you from your final answer on test day.
Thank you for the video. In general what types of doctors do your students seek out to confirm their accommodations with the MCAT board?
This depends on the specific issue. For example one student was breastfeeding, another student had a kidney issue and saw her specialist. Many students get accommodations for ADHD which requires a psychiatric workup...
Great video. The left/right eye method is one in which I will never understand. I'm sticking with the R/S guess/check method
Sounds like you found what works for you! Thanks for watching!
I don't think the virus pushes at all....lol To push means it has some energy but that is not it You would have to learn about clathrins and stop saying push. It is almost like a lock and key system with the virus and if the receptors on the host match with the those on the viral particles, the cell takes the virion in via endocytosis(rme).
I was really scared abt maths in the med exam thks for these it’s so cool - Do more!!!!! 🌺
So glad you like it! Have you seen this? leah4sci.com/mcat/mcat-math-without-a-calculator/
Thank you so much ❤️
You’re welcome 😊
Hi! Around 9:00 into this video, why won’t H2O do nucleophilic attack into the imine on the right (where N has positive charge with 4 bonds total)? Why does O in OH group have to form double bond with the carbon and kick out C-N pi bond to the nitrogen for H2O to then attack the carbonyl Carbon? Is it because C=O+ makes electrophilic carbon more electrophilic than C=N+?? Thank you!
Thanks. I tookn't chem in high school or college and known't much of anything about it. I'm preparing to startify initiating commencement of beginnification of learning it.
you're so welcome!
Cries *
Sending hugs, you CAN reach for your dreams!
😮😮😮
??
Just to check if I got that right haha Basically, in here, the (-) side of the cell is giving electrons to the +ions by the cathode, and the (+) side is receiving electrons from the -ions by the anode. The cathode is reducing ions, and the anode oxidizing them. In the galvanic cell, the cathode is still reducing, but it's reducing what exactly, the anode? So, the metal in the cathode goes to the ion form, getting itself oxidized while reducing the anode, which is oxidizing the cathode while reducing the +ions in the other solution? I am a bit lost in this one Is everything right?
I'm working on a comparison video that goes into detail about the differences. I hope to have it out in a few days
@@Leah4sciMCAT Already got my exam haha but thanks, I will check it
are we supposed to convert g to kg? or can we use g in this case?
If you're working through calculations, you have to make sure units are consistent. If you're dealing with two different units for weight you have to convert one to the other
Whattttt i dont understand 😭😭😭 amd my test is tomorrow 😭😭
I'm sorry you weren't understanding! How do you feel about your exam?
🔥 Thank you.
you're welcome!
I want to cries everytime I study for the MCAT. I swear I can feel physical pain looking at these 😢
I'm so sorry to hear that! Have you checked out the resources on leah4sci.com/mcat? I want to help you reach your MCAT goal
Why is the carbonyl and H in the wrong place at 10:30? Why are you swapping?
Correct form for a Fischer projection is to have the main carbon chain along the vertical backbone of the structure. That means, by convention, the carbonyl carbon should be on the vertical line and not the horizontal. One swap of the carbonyl and hydrogen changes this to follow convention, but then we have to do the second swap to maintain the R configuration of alanine.
@@Leah4sciMCAT thank you for taking the time to explain :)