In chemistry, a ring is an ambiguous term referring either to a simple cycle of atoms and bonds in a molecule or to a connected set of atoms and bonds in which every atom and bond is a member of a cycle (also called a ring system). A ring system that is a simple cycle is called a monocycle or simple ring, and one that is not a simple cycle is called a polycycle or polycyclic ring system. A simple ring contains the same number of sigma bonds as atoms, and a polycyclic ring system contains more sigma bonds than atoms. A molecule containing one or more rings is called a cyclic compound, and a molecule containing two or more rings (either in the same or different ring systems) is termed a polycyclic compound. A molecule containing no rings is called an acyclic or open-chain compound. (Wikipedia).
Ring Theory: We define rings and give many examples. Items under consideration include commutativity and multiplicative inverses. Example include modular integers, square matrices, polynomial rings, quaternions, and adjoins of algebraic and transcendental numbers.
From playlist Abstract Algebra
Abstract Algebra: The definition of a Ring
Learn the definition of a ring, one of the central objects in abstract algebra. We give several examples to illustrate this concept including matrices and polynomials. Be sure to subscribe so you don't miss new lessons from Socratica: http://bit.ly/1ixuu9W ♦♦♦♦♦♦♦♦♦♦ We recommend th
From playlist Abstract Algebra
Definition of a Ring and Examples of Rings
Please Subscribe here, thank you!!! https://goo.gl/JQ8Nys Definition of a Ring and Examples of Rings - Definition of a Ring. - Definition of a commutative ring and a ring with identity. - Examples of Rings include: Z, Q, R, C under regular addition and multiplication The Ring of all n x
From playlist Abstract Algebra
Units in a Ring (Abstract Algebra)
The units in a ring are those elements which have an inverse under multiplication. They form a group, and this “group of units” is very important in algebraic number theory. Using units you can also define the idea of an “associate” which lets you generalize the fundamental theorem of ar
From playlist Abstract Algebra
Abstract Algebra | What is a ring?
We give the definition of a ring and present some examples. http://www.michael-penn.net http://www.randolphcollege.edu/mathematics/
From playlist Abstract Algebra
Ring Theory: We define ring homomorphisms, ring isomorphisms, and kernels. These will be used to draw an analogue to the connections in group theory between group homomorphisms, normal subgroups, and quotient groups.
From playlist Abstract Algebra
Introduction to Dendrochronology
Now that we've gone over all the basics in our study of botany, it's time to start digging into some more advanced topics. First we will examine the field of dendrochronology over five tutorials. This is the study of trees over time, and as such, it is the study of tree rings. These are ri
From playlist Botany
Visual Group Theory, Lecture 7.1: Basic ring theory
Visual Group Theory, Lecture 7.1: Basic ring theory A ring is an abelian group (R,+) with a second binary operation, multiplication and the distributive law. Multiplication need not commute, nor need there be multiplicative inverses, so a ring is like a field but without these properties.
From playlist Visual Group Theory
Rings and modules 1 Introduction
This lecture is part of an online course on ring theory, at about the level of a first year graduate course or honors undergraduate course. This is the introductory lecture, where we recall some basic definitions and examples, and describe the analogy between groups and rings. For the
From playlist Rings and modules
More EAS & Benzylic Reactions: Crash Course Organic Chemistry #39
We’ve already learned a lot about electrophilic aromatic substitution (EAS) and benzene, but guess what? There’s even more to learn! In this episode of Crash Course Organic Chemistry we’ll revisit our old friends the Friedel-Crafts reactions and learn some of their limitations and look at
From playlist Organic Chemistry
Biochemical Building Blocks & Fischer and Haworth Projections: Crash Course Organic Chemistry #48
Although we've spent a lot of time in this series looking at human-made organic chemicals, the term "organic chemistry" was originally used to describe molecules isolated from living things. In this episode of Crash Course Organic Chemistry, we're going back to our roots to learn more abou
From playlist Organic Chemistry
Aromaticity, Hückel's Rule, and Chemical Equivalence in NMR: Crash Course Organic Chemistry #36
If you’ve been paying attention so far in this series, you’ve probably heard of benzene. This molecule is flat, cyclic, and belongs to a special class of compounds known as aromatics. In this episode of Crash Course Organic Chemistry, we’ll learn all about aromatic compounds, their propert
From playlist Organic Chemistry
CCHF VS 12.2 - Dr Shane Krska | Applications of C–H Functionalization in Drug Discovery
In this video Dr Shane Krska from Merk & Co., Inc., presents on applications of C–H functionalization in drug discovery
From playlist CCHF Virtual Symposia
Cyclohexanes: Crash Course Organic Chemistry #7
Hexagons appear all over the natural world from honeycomb to bubbles, and they even appear in organic chemistry! In this episode of Crash Course Organic Chemistry, we're learning all about cyclohexanes, including how rings pucker to relieve strain, the boat and chair conformations, and how
From playlist Organic Chemistry
More EAS - Electron Donating and Withdrawing Groups: Crash Course Organic Chemistry #38
In the previous episode we discussed what happens when we use electrophilic aromatic substitution to add a group to a benzene ring, but what happens when you try to add even more groups? Well, things get a little more complicated. In this episode of Crash Course Organic Chemistry, we’ll co
From playlist Organic Chemistry
Structure and Functional Groups (IOC 1)
I hope you enjoyed the video! I'm planning on making a full series of videos if these videos are helpful for people! I mistakenly labeled diethyl sulfide as propanethiol. Recommended Texts: J. Clayden, N. Greeves, S. Warren, Organic Chemistry Second Edition, Oxford University Press, 201
From playlist Organic Chemistry Lectures
Diazonium Salts & Nucleophilic Aromatic Substitution: Crash Course Organic Chemistry #47
Have you ever wondered where cured meats like salami or pepperoni get their bright red color? Of course its from organic chemistry! A chemical called nitric acid gives them that bright color, while also increasing their shelf. It's also involved in some other interesting reactions. In this
From playlist Organic Chemistry
Intro to Electrophilic Aromatic Substitution: Crash Course Organic Chemistry #37
We’ve talked about benzene a bit already in this series, but did you know that benzene rings are present in all kinds of familiar substances? The styrofoam packaging that comes with new appliances, some pharmaceuticals, pesticides, and even some explosives contain benzene. In this episode
From playlist Organic Chemistry
Chem 125. Advanced Organic Chemistry. 2. Spirocyclic, Polycyclic, & Heterocyclic Compounds.
UCI Chem 125 Advanced Organic Chemistry (Spring 2016) Lec 2. Spirocyclic, Polycyclic, & Heterocyclic Compounds View the complete course: http://ocw.uci.edu/courses/chem_125_advanced_organic_chemistry.html Instructor: James S. Nowick, Ph.D. License: Creative Commons BY-NC-SA Terms of Use:
From playlist Chem125: Advanced Organic Chemistry
Rings and midules 3: Burnside ring and rings of differential operators
This lecture is part of an online course on rings and modules. We discuss a few assorted examples of rings. The Burnside ring of a group is a ring constructed form the permutation representations. The ring of differentail operators is a ring whose modules are related to differential equat
From playlist Rings and modules