- published: 26 Dec 2016
- views: 48400
Chem may refer to:
In Ancient Egyptian usage:
CHEM may refer to :
Organic chemistry is a chemistry subdiscipline involving the scientific study of the structure, properties, and reactions of organic compounds and organic materials, i.e., matter in its various forms that contain carbon atoms. Study of structure includes many physical and chemical methods to determine the chemical composition and the chemical constitution of organic compounds and materials. Study of properties includes both physical properties and chemical properties, and uses similar methods as well as methods to evaluate chemical reactivity, with the aim to understand the behavior of the organic matter in its pure form (when possible), but also in solutions, mixtures, and fabricated forms. The study of organic reactions includes probing their scope through use in preparation of target compounds (e.g., natural products, drugs, polymers, etc.) by chemical synthesis, as well as the focused study of the reactivities of individual organic molecules, both in the laboratory and via theoretical (in silico) study.
The Top may refer to
Khan Academy is a non-profit educational organization created in 2006 by educator Salman Khan with the aim of providing a free, world-class education for anyone, anywhere. The organization produces short lectures in the form of YouTube videos. In addition to micro lectures, the organization's website features practice exercises and tools for educators. All resources are available for free to anyone around the world. The main language of the website is English, but the content is also available in other languages.
The founder of the organization, Salman Khan, was born in New Orleans, Louisiana, United States to immigrant parents from Bangladesh and India. After earning three degrees from the Massachusetts Institute of Technology (a BS in mathematics, a BS in electrical engineering and computer science, and an MEng in electrical engineering and computer science), he pursued an MBA from Harvard Business School.
In late 2004, Khan began tutoring his cousin Nadia who needed help with math using Yahoo!'s Doodle notepad.When other relatives and friends sought similar help, he decided that it would be more practical to distribute the tutorials on YouTube. The videos' popularity and the testimonials of appreciative students prompted Khan to quit his job in finance as a hedge fund analyst at Connective Capital Management in 2009, and focus on the tutorials (then released under the moniker "Khan Academy") full-time.
Chemistry is a branch of physical science that studies the composition, structure, properties and change of matter. Chemistry includes topics such as the properties of individual atoms, how atoms form chemical bonds to create chemical compounds, the interactions of substances through intermolecular forces that give matter its general properties, and the interactions between substances through chemical reactions to form different substances.
Chemistry is sometimes called the central science because it bridges other natural sciences, including physics, geology and biology. For the differences between chemistry and physics see Comparison of chemistry and physics.
Scholars disagree about the etymology of the word chemistry. The history of chemistry can be traced to alchemy, which had been practiced for several millennia in various parts of the world.
The word chemistry comes from the word alchemy which was an earlier set of practices that encompassed elements of chemistry, metallurgy, philosophy, astrology, astronomy, mysticism and medicine. It is often seen as linked to the quest to turn lead or another common starting material into gold. Alchemy, which was practiced around 330, is the study of the composition of waters, movement, growth, embodying, disembodying, drawing the spirits from bodies and bonding the spirits within bodies (Zosimos). An alchemist was called a 'chemist' in popular speech, and later the suffix "-ry" was added to this to describe the art of the chemist as "chemistry".
This video tutorial study guide review is for students who are taking their first semester of college general chemistry, IB, or AP Chemistry. Even if you’re studying for the general chemistry section of the MCAT, DAT, PCAT, OAT or SAT Subject chemistry test, this video can help give you a nice overview of all the topics you need to learn in General Chemistry 1. This introduction video contains plenty of examples and practice problems to help prepare you for the final exam. It has about 160 multiple choice questions in the form of a practice test. Feel free to use it as a study guide. The solutions to each problem is provided as well as the equations and formulas that you need to solve it. General Chemistry Playlist: https://www.youtube.com/watch?v=bka20Q9TN6M&list;=PL0o_zxa4K1BV-uX6wX...
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Hank does his best to convince us that chemistry is not torture, but is instead the amazing and beautiful science of stuff. Chemistry can tell us how three tiny particles - the proton, neutron and electron - come together in trillions of combinations to form ... everything. In this inaugural episode of Crash Course Chemistry, we start out with one of the biggest ideas in chemistry ever - stuff is made from atoms. More specifically, we learn about the properties of the nucleus and why they are important to defining what an atom actually is. Like CrashCourse? http://www.facebook.com/YouTubeCrashCourse Follow CrashCourse! http://www.twitter.com/TheCrashCourse Tumbl CrashCourse. http://thecrashcourse.tumblr.com Table of Contents Einstein & Atoms 02:05 Composition of Atoms 03:18 Atomic Num...
This video tutorial provides an introduction or basic overview on what you will learn in your first college semester of organic chemistry. Organic Chemistry Playlist: https://www.youtube.com/watch?v=n5vjCqnVb6s&index;=1&t;=25s&list;=PL0o_zxa4K1BU3gxU8RwqkEET2ilZ80Znj Support: https://www.patreon.com/MathScienceTutor Here is a list of topics covered in this video: 1. How To Draw Lewis Structures of Organic Compounds -Butane, Hexane, 2-methylpentane, 2-chloro-3-bromoheptane, 2,2,3,3-tetramethylbutane, 2-butene, and 3-hexyne 2. How To Draw a Line Structure From a Condensed Structure: CH3CHCH2, (CH3)3CCH2CCH, (CH3)2CHCH2CH2 3. How to Draw The Lewis Structure of Functional Groups Alcohols, Carboxylic Acids, Esters, Aldehydes, Ketones, Alkyl Halides, Ethers, Amines, Amides, & Ionic Str...
Update! Check out http://www.studyorgo.com for the easiest and fastest way to learn Organic Chemistry in 2016-2017. Use coupon code “ELISE” to save 20%. Hope this helps you guys out if you need the extra help with OCHEM! A guide to high school organic chemistry, filled with understandable information and lots of examples! Part 2: http://www.youtube.com/watch?v=Mgu11DmuL48&feature;=youtu.be Condensed version: http://www.youtube.com/watch?v=HUrld0BXAao This is part 1 of the longer version of my video about organic chemistry. The shorter video covers absolutely all of the same material, but in a shorter time (less examples and explanations). Now please don't think "ah! an hour long video, that's way too long," because it is truly Jam Packed with information that I learned over several wee...
A big picture intro to chemistry and why it is fascinating. Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivity. This material roughly covers a first-year high school or college course, and a good understanding of algebra is helpful. About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also p...
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