Uploaded April 2025 | Updated September 2026, 2 weeks ago
These are two of the most commonly confused concepts in STEM. Here, I clearly explain the difference quickly and efficiently. You’ll see why scientists and engineers care, how these ideas show up on exams, and you’ll practice with worked problems so you can apply the concepts with confidence on tests and in lab settings.
Related Units:
If you want a strong foundation for chemistry, watch the full playlist: youtube.com/playlist?list=PLvUW25kBaMMssGHFrR4Ee7_-8cFBvBkgN
If you're studying early atomic theory, this playlist is your friend: youtube.com/playlist?list=PLvUW25kBaMMszGN5XY0QXNP_t-9Z-B8C2
If you're studying for the MCAT: youtube.com/playlist?list=PLvUW25kBaMMuJZI5IVWO8X0syBANn-YqY
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Time Stamps:
0:00 Intro
0:10 Accuracy
0:43 Precision
1:19 Visualization of Accuracy & Precision
1:51 Why scientists and engineers care / Real-World Importance
2:40 TLDR
2:49 Practice Problems
What's the difference between accuracy and precision?
A clock consistently runs 5 minutes fast. Is it accurate, precise, both or neither?
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These are two of the most commonly confused concepts in STEM. Here, I clearly explain the difference quickly and efficiently. You’ll see why scientists and engineers care, how these ideas show up on exams, and you’ll practice with worked problems so you can apply the concepts with confidence on tests and in lab settings.
Related Units:
If you want a strong foundation for chemistry, watch the full playlist: youtube.com/playlist?list=PLvUW25kBaMMssGHFrR4Ee7_-8cFBvBkgN
If you're studying early atomic theory, this playlist is your friend: youtube.com/playlist?list=PLvUW25kBaMMszGN5XY0QXNP_t-9Z-B8C2
If you're studying for the MCAT: youtube.com/playlist?list=PLvUW25kBaMMuJZI5IVWO8X0syBANn-YqY
🧪 For the chemist who prefers eyebrows: Grab the complete collection of 11 hand-drawn lab safety posters: payhip.com/b/SNQL0
🍵Buy the Professor a tea to keep the videos coming: patreon.com/c/ChemistryinaNutshell
🔬As an Amazon Affiliate, I earn from qualifying purchases at no extra cost to you. Start your shopping here: amzn.to/3IXuAcS
Time Stamps:
0:00 Intro
0:10 Accuracy
0:43 Precision
1:19 Visualization of Accuracy & Precision
1:51 Why scientists and engineers care / Real-World Importance
2:40 TLDR
2:49 Practice Problems
What's the difference between accuracy and precision?
A clock consistently runs 5 minutes fast. Is it accurate, precise, both or neither?
Stock Images:
"Colorful Pills" Free Stock Videos by Videezy! videezy.com
"Aerial Drone Shot of Oregon Cherry Blossoms Park And River Bridge" Free Stock Videos by Videezy! videezy.com










![SN2 Trap: Why (R) Doesnt Always Invert to (S)
Think SN2 always inverts R/S configuration? Dont fall for the (R) to (R) trap on your midterm! If youve been taught the Golden Rule that SN2 must flip between R/S, this video is required viewing.
Were dissecting a textbook lie utilizing a 1970s breakthrough from the H.C. Brown lab. Ill show you exactly how an (R) reactant can produce an (R) product through a perfectly standard SN2 mechanism, WITHOUT breaking a single rule.
📘Master the Mechanisms! Grab the Organic Chemistry Reaction Mechanisms Survival Guide: https://payhip.com/b/rYbBp
🧠Full Mechanisms Playlist: https://www.youtube.com/playlist?list=PLvUW25kBaMMtvqt_IBtezyBX_kk447pxZ
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🧬If you need a refresher on chirality for mechanisms to make sense, start here: https://www.youtube.com/playlist?list=PLvUW25kBaMMupOdw1Wgy8YauiQ40J_5nx
⚗️For all of my ochem videos in one place: https://www.youtube.com/playlist?list=PLvUW25kBaMMuKRkW9gDV7vlAk4Y9WRU7c
🥼If you need to take the MCAT: https://www.youtube.com/playlist?list=PLvUW25kBaMMuJZI5IVWO8X0syBANn-YqY
What youll master in this gotcha question breakdown:
• The CIP Trap: Why (R) to (R) isnt a mechanism failure, but a priority change.
• Super-Hydride Logic: Dissection lithium triethylborohydride (LiEt3BH) to see why its the surgical strike of nucleophiles.
• The Spatial Literacy Test: Using 3D molecular models to see the backside attack when the 2D drawings fail you.
0:00 The 5-Point SN2 Chirality Trap
0:23 Tiebreakers: Assigning Priorities to the Reactant
1:00 The Hand Rule: Confirming the (R) Configuration
1:26 Is Super-Hydride too bulky for SN2?
1:48 [SOURCE] Krishnamurthy & Brown Paper (1982)
2:08 3D Model Walkthrough: Geometry of the Nucleophile
2:54 The Mechanism: Concerted Backside Attack
3:55 The Umbrella Inversion vs. Configuration
4:30 Re-evaluating Priorities for the Product
4:56 The Hand Rule: Why the Product is (R)
5:10 The Verdict: Why (R) stayed (R)
5:23 Pro-Tip: How to assign R/S in seconds
📖The Research (Primary Source for LiEt3BH): Selective reductions. 31. Lithium triethylborohydride as an exceptionally powerful nucleophile. A new and remarkably rapid methodology for the hydrogenolysis of alkyl halides under mild conditions
S. Krishnamurthy and Herbert C. Brown
The Journal of Organic Chemistry 1983 48 (18), 3085-3091
DOI: 10.1021/jo00166a031
https://pubs.acs.org/doi/pdf/10.1021/jo00166a031
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Citations:
Paula Yurkanis Bruice, Organic Chemistry 8th ed
https://openstax.org/details/books/organic-chemistry
https://openstax.org/details/books/chemistry-2e
Music: https://youtu.be/lL6AsbG07xY SN2 Trap: Why (R) Doesnt Always Invert to (S)](https://i.ytimg.com/vi/IHSRGx_GlZA/mqdefault.jpg)