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Chemistry Steps
United States
เข้าร่วมเมื่อ 11 มิ.ย. 2017
Hello and Welcome to Chemistry Steps!
Here you will find the best Organic Chemistry Summary Sheets and Tons of Practice Problems.
I am Dr. Sargsyan. I have a PhD in Organic Chemistry and I am a full-time faculty of Chemistry in the US.
Chemistry Steps will give you the resources to succeed in your college classes or in tainge standardized tests like AP, MCAT and PCAT,
Subscribe to this channel and be notified whenever a new video is uploaded.
Here you will find the best Organic Chemistry Summary Sheets and Tons of Practice Problems.
I am Dr. Sargsyan. I have a PhD in Organic Chemistry and I am a full-time faculty of Chemistry in the US.
Chemistry Steps will give you the resources to succeed in your college classes or in tainge standardized tests like AP, MCAT and PCAT,
Subscribe to this channel and be notified whenever a new video is uploaded.
Steric vs Torsional Strain
Although quite similar and often used interchangeably, steric torsional interactions have different definitions. Sterics or steric interactions are the obstructions caused by the size of neighboring groups and atoms. In other words, it is simply two or more atoms/groups getting in each other’s way because of tight space.
Torsional interactions are the result of repulsive forces between the bonding electrons of neighboring atoms.
For example, when two hydrogen atoms on neighboring carbons are aligned, there is no steric interaction because the atoms are too small. There is, however, some unfavorable energy which is due to the torsional strain. Two methyl groups, on the other hand, are large enough to exhibit steric interactions.
For more details about steric and torsional interactions, visit www.chemistrysteps.com/steric-vs-torsional-strain/
Torsional interactions are the result of repulsive forces between the bonding electrons of neighboring atoms.
For example, when two hydrogen atoms on neighboring carbons are aligned, there is no steric interaction because the atoms are too small. There is, however, some unfavorable energy which is due to the torsional strain. Two methyl groups, on the other hand, are large enough to exhibit steric interactions.
For more details about steric and torsional interactions, visit www.chemistrysteps.com/steric-vs-torsional-strain/
มุมมอง: 197
วีดีโอ
Chair Conformation of Cyclohexane
มุมมอง 192 หลายเดือนก่อน
A short video clip for better visualization of the chair cyclohexane forms with the bond angles and perspectives in 3D format. The axial positions are pointed straight up or down along the vertical direction. The equatorial positions are pointing to the sides, parallel to two C-C bonds in the chair. For more details and practice problems on the chair coformation of cylcohexane, visit www.chemis...
Newman Projections and Conformations of Butane
มุมมอง 272 หลายเดือนก่อน
This video shows the Newman projections of butane and different conformations such as eclipsed, staggered, anti, syn, gauche and their stability on an energy diagram. More details on Newman projections of butane can be found at www.chemistrysteps.com/newman-projection-and-conformational-analysis-of-butane/
Fischer Projections - Practicing the Rules
มุมมอง 2.6K2 ปีที่แล้ว
This video is a fragment of the Stereochemistry quiz and explains the rules for drawing Fischer projections in the context of determining the relationship between given compounds. Read more about the Fischer projections: www.chemistrysteps.com/fischer-projection/ Check out the 108-questions, multiple-choice Stereochemistry quiz which comes with a 3-hour video solution: www.chemistrysteps.com/co...
Alkene Electrophilic Addition Reactions Quiz
มุมมอง 7002 ปีที่แล้ว
Electrophilic additions of alkenes are on the basis of many reactions you will see in organic chemistry. The first here is to understand the regiochemistry of the reaction which is explained by the Markovnikov's rule which states that in the addition reaction of HX to an unsymmetrical alkene, the H adds to the carbon that already has the greater number of hydrogen atoms. The quiz can be found a...
How to Name a Compound with Multiple Functional Groups
มุมมอง 5K2 ปีที่แล้ว
To Name a Compound with Multiple Functional Groups, we need to identify the functional group with the highest priority. This group defines the suffix of the compound and all the other groups are treated as substituents and added to the name with prefixes. This video is a fragment of a multiple-choice quiz on IUPAC nomenclature that comes with a two-hour video solution. The quiz can be found at:...
Grignard Reagent with Esters - a Practice Example
มุมมอง 1.6K2 ปีที่แล้ว
Esters undergo two nucleophilic additions of Grignard reagents because the first addition results in a ketone which is more reactive than the ester. This example is a fragment from a comprehensive multiple choice quiz on the reactions of alcohols with a 1.5-hour video solution. You can access the quiz at: www.chemistrysteps.com/courses/alcohols-naming-preparation-and-reactions/ More about the G...
Constitutional Isomers Practice Examples
มุมมอง 1.7K2 ปีที่แล้ว
Access the full, 2-hour video and the quiz covering the topics of constitutional isomers, functional groups, Lewis structures, resonance structures and curved arrows here: All the other quizzes can be found here: www.chemistrysteps.com/organic-chemistry-practice-problem-quiz/ To learn more about the benefits of Chemistry Steps, visit: www.chemistrysteps.com/organic-chemistry-study-guides-practi...
Organic Chemistry Quizzes
มุมมอง 2692 ปีที่แล้ว
Organic Chemistry Quizzes - Hundreds of different style multiple-choice questions to practice organic chemistry. Check here for more details: www.chemistrysteps.com/organic-chemistry-practice-problem-quiz/
NMR Spectroscopy Practice Problems - Solving NMR Step by Step
มุมมอง 74K5 ปีที่แล้ว
In this video, we will go over the strategies for solving NMR problems step by step. This practice problem involves determination of Hydrogen Deficiency Index and the essential skills such understanding the integration and splitting patterns in NMR spectroscopy. The complete series of practice problems and over 100 min of NMR-solving videos that also address Carbon NMR, DEPT and IR spectroscopy...
Endo and Exo Selectivity in the Diels-Alder Reaction
มุมมอง 19K6 ปีที่แล้ว
In the Diels-Alder reaction, the Endo and Exo products are formed when a cyclic diene is reacted with a dienophile. In most cases, the endo product is considered to be the major product. However, the exo product is more stable because the groups of the dienophile are pointing away from the major ring system. The reason that endo is considered the major product in Diels-Alder reaction, is becaus...
R and S Configuration Practice Problems
มุมมอง 57K6 ปีที่แล้ว
R and S configurations are essential in understanding almost all the concepts in Stereochemistry. In this video we will practice assigning the Absolute Configuration - R and S using the Cahn-Ingold-Prelog priority rules for ranking substituents. These practice problems will cover determining the R and S configuration for simple molecules and for the ones where you need to look further into the ...
IR Infrared Spectroscopy Practice Problems - Real Spectra
มุมมอง 101K6 ปีที่แล้ว
In this video will do practice problems determining the correct compound based on the Infrared (IR) spectroscopy data. IR spectra are always crowded with peaks and analyzing them seems like a tedious task at times. But don’t worry. In this video, we will be solving IR spectra step-by-step focusing on the most important regions and the peaks that you need to pay attention. Keep in mind that IR s...
VSEPR Theory and Molecular Geometry - BF3, CH2O, HCN, BeCl2, CH2Cl2, SOCl2, SO2
มุมมอง 15K7 ปีที่แล้ว
To find more practice problems, lectures and other Chemistry materials, visit www.chemistrysteps.com/student-help/
Lewis Structures: Introduction, H2O, CH4, CO2
มุมมอง 2.8K7 ปีที่แล้ว
To find more practice problems, lectures and other Chemistry materials, visit www.chemistrysteps.com/student-help/
VSEPR Theory and Molecular Geometry - CH4, NH3, H2O
มุมมอง 15K7 ปีที่แล้ว
VSEPR Theory and Molecular Geometry - CH4, NH3, H2O
Ideal Gas Law: Total Pressure of Two Flasks
มุมมอง 31K7 ปีที่แล้ว
Ideal Gas Law: Total Pressure of Two Flasks
Stoichiometry: Mole Ratio - The Easy Way
มุมมอง 9K7 ปีที่แล้ว
Stoichiometry: Mole Ratio - The Easy Way
Molarity: Ion Concentration Practice Problem 2 - K3PO4
มุมมอง 3.5K7 ปีที่แล้ว
Molarity: Ion Concentration Practice Problem 2 - K3PO4
Limiting Reactant in Precipitation Reactions Practice Problem
มุมมอง 7K7 ปีที่แล้ว
Limiting Reactant in Precipitation Reactions Practice Problem
Converting Between Moles, Atoms, and Molecules, Practice Problem 2
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Converting Between Moles, Atoms, and Molecules, Practice Problem 2
Converting Between Moles, Atoms, and Molecules, Practice Problem 3
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Converting Between Moles, Atoms, and Molecules, Practice Problem 3
Stoichiometry: Percent Yield, Practice Problem 1
มุมมอง 1.7K7 ปีที่แล้ว
Stoichiometry: Percent Yield, Practice Problem 1
A Comprehensive Stoichiometry Problem: Mole Ratio, Limiting Reactant, Percent Yield
มุมมอง 2.1K7 ปีที่แล้ว
A Comprehensive Stoichiometry Problem: Mole Ratio, Limiting Reactant, Percent Yield
Stoichiometry: Percent Yield, Practice Problem 3
มุมมอง 1.2K7 ปีที่แล้ว
Stoichiometry: Percent Yield, Practice Problem 3
Stoichiometry: Percent Yield, Practice Problem 2
มุมมอง 1.6K7 ปีที่แล้ว
Stoichiometry: Percent Yield, Practice Problem 2
Just what i need
D is correct
Where is the answers to the rest questions ?
for d) how did you know the wedge ch3 get priority than the ch3 without wedge
The wedge is a CH2 connected to two hydrogens and a CH3 (H, H, C) whereas the other one is a CH3 (H, H, H), so it only has three hydrogens connected to it. Becasue of the carbon connected to it, the former gets a higher priority.
Can you please do some notes explaining aldol, claisen and michael reaction mechanism even spectroscopy analysis if possible 😢🙏
www.chemistrysteps.com/
Where is the rest? Seriously!!!!
how about 3-carboxy-2-methylpentanoic acid? is this correct or will it be 2-Ethyl-3-Methyl Butane-dioc acid?
Thanks broski
this was amazing practice and I got them all right!, it was helpful and replenished my confidence before my exam today hahaha
Bro where is part 2, can someone hsare the answers i want to verify mine
For those confused about G the reason why it is not S is due to Hydrogen the lowest priority facing forward, if the lowest priority faces towards the front you take whatever configuration it is and flip it. Since the configuration for G is S I see where the confusion comes from but due to H facing the front (indicated by the solid line not dashed) you flip it making it R configuration. Hope this helps =)
wow, mr smart guy here. bet you can’t solve the exercise I solve, if you want to see what exercise is that, give me your email I will send it to you
What if the volume doesn't change
how would that be possible?
Good afternoon sir. If increase doping different concentration OH band decrease..... Any specific reason.. kindly help me sir
It's a really beautiful design. But can you show some low making charge necklaces as already gold prices have touched the sky and it might go beyond that also.
what if they both had different initial temperature?
Amazing ❤
satan made hnmr
I love you so much! SO thorough but straightforward/simple at the same time! Thank God for you!
great video!! thank you :)
You should also note that SINCE total pressure = pressure (Nitrogen ) + pressure hydrogen, you can REWRITE total pressure = (P1*v1/V total + P2/V2/Votal ) = (P1*V1 +P2*V2)/V total . So TOTAL pressure = (1.8 *3 + 3.5 *2)/5 = 2.48 atm
Hello sir, how to calculate the number of moles of gas has flowed from one flask to the other?
You could use the ideal gas law equation (PV = nRT) to calculate the initial moles based on the initial pressure in any of the flasks, and then use the equation again to calculate the moles in the same flask based on the final pressure. The difference should be what's flowed from one flask to the other. Just keep in mind that the flow is continuous in both directions.
Only that. And the others??
Thanks
thanks
Best mass spectrometry identification video with methodical explanation that can actually help someone without making things more complicated. Thank you
Thank you so much, that made so much sense. Be blessed 😃
Maybe slow dowm
More easier way is to equate moles. Like final moles is equal to moles of hydrogen in 2nd + moles of nitrogen in 1st container. Temperature is constant for both. Use n=pv/RT in one go you will find total pressure
Thank you so much sir making these video. This video is very helpful for me to understand NMR spectra.
Thank you for your effort 👌 Good video
Tq uhh
In real scenario the "empty" flask should have air in it, correct?
Even if there is air then again it will be distributed equal in both container so again total pressure will remain same in both containers. Value might differ but concept is same.
This video is amazing, thank you!
Noicccc
First comment in 4 years
Great video. Been looking for this explanation for an hour now. Now I need to look up temperature and boiling points. Lol
Sir please provide the answer key of left ques
This explanation was incredible
Thank you for this video
, I do not think that the last example is correct since there is no C-C double bond peak in the spectrum, I agree with the rest but just because there is sp2 H peak, it does not mean that there is gonna be an alkene, you should check the C-C double bond peak too and unfortunately it does not exist. It is supposed to be between 1630-1680 wn or 1900-2000 wn.
There is a C=C peak at ~1650.
Your conversion from ml to L is wrong The answer should be 4.110 not 0.4110
Thank you for this video, it really helped me a lot
good good
Great explanation. Thanks🙏
THANK YOU SO MUCH!! NAKASABOT GYUD KO!! SHOCKS❤️
So helpful! Thank you!
Good video mate
my name iss afal lama
Thanks sir your method is very good