In the Intersession course Cosmetology 101: The Chemistry of Beauty Products, Johns Hopkins University students spent three weeks exploring the principles of chemistry that underlie the cosmetics industry.

Read more on the Hub: https://hub.jhu.edu/2019/01/29..../chemistry-cosmetics

--
Video by Patrick Ridgely and Dave Schmelick
Johns Hopkins University Office of Communications
video@jhu.edu

Learning Objective: Learn and apply the Law of Conservation of Matter, the Law of Definite Proportions, and the Law of Multiple Proportions.

This video tutorial provides a basic introduction into organic chemistry. Here is a list of topics:

1. How to draw lewis structures of organic compounds
2. Identifying functional groups - alkanes, alkenes, & alkynes
3. Formal charge calculations
4. Resonance structures
5. Basic IUPAC nomenclature of alkanes

_____________________________________
Full-Length Math & Science Videos:
https://www.patreon.com/mathsc....iencetutor/collectio

Organic Chemistry - Basic Introduction:
https://www.youtube.com/watch?v=B_ketdzJtY8

Which Bond Is More Polar?
https://www.youtube.com/watch?v=o0-a5HzSzdE

How To Draw Lewis Structures:
https://www.youtube.com/watch?v=6unef5Hz6SU

Condensed Structures to Skeletal Structures:
https://www.youtube.com/watch?v=HRkvjKHFNDA

Functional Groups Review:
https://www.youtube.com/watch?v=m9jM8lWxrAE

Primary, Secondary, & Tertiary Functional Groups:
https://www.youtube.com/watch?v=r_Zhb0nQEvE

_________________________________
How To Calculate Formal Charge:
https://www.youtube.com/watch?v=C2l-76VP8s0

Finding Lone Pairs Using Formal Charge:
https://www.youtube.com/watch?v=jlCPY6iXQ1c

Dipole Moment & Electronegativity:
https://www.youtube.com/watch?v=bFAU1GMJmnI

Predicting Bond Angles:
https://www.youtube.com/watch?v=DPS7zdg8HzY

Valence Bond Theory:
https://www.youtube.com/watch?v=Vqx9a2aU99c

Hybridization of Atomic Orbitals:
https://www.youtube.com/watch?v=pdJeQUd2g_4

_______________________________
Bond Strength and Bond Length:
https://www.youtube.com/watch?v=SSRY95IAwF8

Orbital Overlap and Bond Length:
https://www.youtube.com/watch?v=BatJrR5sblA

Organic Chemistry PDF Worksheets:
https://www.video-tutor.net/orgo-chem.html

Organic Chemistry Exam 1 Playlist:
https://bit.ly/3kJnNXU

Breaking down all you need to know to keep your hot tub water clear. Alkalinity, PH, Calcium, Testing, Enzymes and Chlorine.
A 8 minute walkthrough on key concepts and a guide on the routine Chris follows with his own hot tub.

Find more at https://hottubuniversity.com/

In this tutorial video, we determine the empirical formula of an organic compound containing carbon, hydrogen, and oxygen from combustion analysis data.

Keep your pool water balanced and close to neutral, and avoid scaling, corrosion, and cloudiness, all with just three pool chemistry components. This isn't just about pool chemicals for beginners, though. Bet you could use a refresher.

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⏰ Timestamps:
00:00​ - Introduction to Pool Chemistry
01:10 - What Is pH
02:35 - What Is Alkalinity
04:03 - How To Balance pH and Alkalinity
08:09 - What Is Calcium Hardness

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Swim University®️ has made swimming pool and hot tub care easy for more than 10 million homeowners. And each year, we continue to help more people with water chemistry, cleaning, and troubleshooting. We know taking care of a swimming pool or spa can be difficult. And it’s hard to find a trusted source of information. We get it! This is the reason we created Swim University®️.

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In this tutorial video, we compare trends in the first ionization energy, second ionization energy, and third ionization energy for Na, Mg, and Si. Electron configurations are used to determine if a core electron or valance electron is being removed.

Chemists need stoichiometry to make the scale of chemistry more understandable - Hank is here to explain why and to teach us how to use it.

Watch this video in Spanish on our Crash Course en Español channel: https://youtu.be/dZoMgEhNKKg

Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!
Download it here for Apple Devices: https://apple.co/3d4eyZo
Download it here for Android Devices: https://bit.ly/2SrDulJ

Table of Contents
Atomic Mass Units 2:24
Moles 5:12
Molar Mass 5:59
Equation Balancing 8:45
Molar Ratios 11:11

Resources:
http://www.chemistry.oregonsta....te.edu/courses/ch121
http://www.iupac.org/publicati....ons/ci/2004/2601/1_h

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Learning Objective: Evaluate the number of valence electrons and core electrons from the electron configurations.

Topics: core electrons, valence electrons

In this example problem, we show how to fill a molecular orbital diagram for a diatomic molecule and use molecular bond theory to compare bond order, bond strength, and magnetic properties (paramagnetic or diamagnetic).

Use molecular orbital theory to determine:
a.) the bond order of N2
b.) whether N2 is paramagnetic or diamagnetic
c.) order of increasing bond strength for N2, N22-, N2+

Hello Chemists hope you enjoyed this video thank you for watching!

If there is anything you wish for me to elaborate on please do not hesitate to comment down below or you can dm me on Instagram
My Instagram; https://www.instagram.com/phexdee/
My university degree is Medicinal Chemistry and Pharmacology. If you guys would like me to do a video on the career paths for alevel chemistry please let me know in the comments below

All my recommended resources
Some of these models may be in the AQA version because I did AQA however all you have to do is search for the make in your own version
Jim Clark Calculations for AS/A level Chemistry (HIGHLY HIGHLY RECOMMENDED): https://www.amazon.co.uk/Calculations-Level-Chemistry-Jim-Clark/dp/0582411270/ref=sr_1_1?dchild=1&hvadid=80401819684682&hvbmt=be&hvdev=c&hvqmt=e&keywords=jim+clark+calculations+in+chemistry&qid=1589726863&sr=8-1
GCP AS and A level Chemistry Revision guide: https://www.cgpbooks.co.uk/sec....ondary-books/as-and-
Snaprevise(HIGHLY RECOMMENDED): https://snaprevise.co.uk/
Chemguide:
Chemrevise (HIGHLY RECOMMENDED): https://chemrevise.org/
Quizlet: www.quizlet.com
Oxford A-level Chemistry textbook (HIGHLY RECOMMENDED): https://www.amazon.co.uk/AQA-Chemistry-Level-Student-Book/dp/0198351828/ref=asc_df_0198351828/?tag=googshopuk-21&linkCode=df0&hvadid=310913487793&hvpos=&hvnetw=g&hvrand=8145005145446194771&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9044962&hvtargid=pla-524196499887&psc=1&th=1&psc=1
Chemsheets: https://www.scisheets.co.uk/
HodderEducation Practical guide: https://www.amazon.co.uk/AQA-level-Chemistry-Student-Guide/dp/1471885143/ref=asc_df_1471885143/?tag=googshopuk-21&linkCode=df0&hvadid=311040585758&hvpos=&hvnetw=g&hvrand=9399351634496333957&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9044962&hvtargid=pla-565420167555&psc=1&th=1&psc=1
Pearson Chemistry Lab book: https://www.amazon.co.uk/AQA-level-Chemistry-Book-Science/dp/1292245298/ref=asc_df_1292245298/?tag=googshopuk-21&linkCode=df0&hvadid=310913487793&hvpos=&hvnetw=g&hvrand=15124858193281357426&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9044962&hvtargid=pla-562954778051&psc=1&th=1&psc=1

My Favourite place for Exam questions:
Physicsandmathstutor: https://www.physicsandmathstut....or.com/chemistry-rev
ScienceSkool (HIGHLY RECOMMENDED): http://www.scienceskool.co.uk/
MathsMadeEasy: https://mathsmadeeasy.co.uk/a-....level-chemistry-revi
Alevelchemistry (HIGHLY RECOMMENDED) : http://www.a-levelchemistry.co.uk/

My favourite a-level chemistry youtubers:
Machemguy (HIGHLY RECOMMENDED): https://www.youtube.com/user/MaChemGuy
AlleryTutors: https://www.youtube.com/channe....l/UCPtWS4fCi25YHw5SP

💕 Click here to Subscribe to my channel it would really mean a lot to me: 💕https://www.youtube.com/channe....l/UCmouO_YSmwj15bUdL

✨ You can find me on ✨
Instagram : @phexdee
Twitter : @phedra_forever
Snapchat; @Phedra_hart

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CRAETION - Memory
soundcloud: https://soundcloud.com/craetion

GUUSTAVV - Neopolitin
Spotify: https://spoti.fi/2vGuy3E

✨ FAQs: ✨
What's your name? Phedra
How old are you? 18
What country am you from? Ghana and Germany
How tall are you? 5ft 3
What year are you in? Year 13 going to university in September/October 2020
What do you study at A-Levels? Biology, Chemistry and English Literature
What Uni degree do you wish to study? Medicinal Chemistry and Pharmacology

Specs used in video:
🌸 MY CAMERA: https://www.digibroadcast.com/photo-c152/canon100d185540stm-camera-18-55-stm-is-40mm-stm-lenses-p16380/s16677?utm_source=google&utm_medium=cpc&utm_term=canon100d185540stm-camera-18-55-stm-is-40mm-stm-lenses-canon100d185540stm&utm_campaign=product%2Blisting%2Bads&gclid=CjwKCAjwwYP2BRBGEiwAkoBpAieBeGUTgAQqqOHkqfLA8eMpE8jafgoDe_Xwm4_n8RAHd97AvWs8nxoCHMwQAvD_BwE
🌸 MY TRIPOD: https://www.amazon.co.uk/Velbon-EF-61-Tripod/dp/B0191ZSA3S/ref=sr_1_5?crid=3MBPVKKNZJFXN&dchild=1&keywords=velbon+tripod&qid=1589761246&sprefix=velbon%2Caps%2C143&sr=8-5
🌸 MY IPAD: https://www.amazon.co.uk/Apple....-iPad-11-inch-Wi-Fi-
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🌸 MY IPAD CASE: https://www.amazon.co.uk/TiMOVO-Generation-Magnetic-Trifold-Charging/dp/B083QXNH6Z/ref=sr_1_62?dchild=1&keywords=ipad+pro+case&qid=1589761541&s=electronics&sr=1-62
🌸 NOTE-TAKING APP: https://support.gingerlabs.com/hc/en-us
🌸 MY LAPTOP: https://www.amazon.co.uk/Apple....-MacBook-13-inch-Ret
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Please do not hesitate to comment any video requests x 💕💕💕

This video outlines the course content for CHEMISTRY, for first year student in the university.

watch now, comments,like and subscrible for more details

#university #chemistry #futo #IMSU #unnnews #UNIZIK #unilag

Chemistry is the study of matter, its properties, how and why substances combine or separate to form other substances, and how substances interact with energy. Understanding basic chemistry concepts is important for almost every profession. Chemistry is part of everything in our lives.

In this video Chemistry 101 - Atomic Structure, we study atomic structures which refers to the structure of an atom that comprises of Nucleus, Protons, and Neutrons.

Nucleus - is the positively charged center of the atom consisting of protons and neutrons.
Protons - Positively charged subatomic particle forming part of the nucleus of an atom
Neutrons - A subatomic particle forming part of the nucleus of an atom.

Our collection of videos in Chemistry covers most of the syllabus for exams such as WAEC, NECO, JAMB, and GCE.

atomic structure and theory
atomic structure chemistry
atomic structure elements
atomic structure explained
chemistry syllabus for jamb 2020
chemistry topics
chemistry branches

Mobile classroom application is bridging the gap between students and learning by giving them the opportunity to take classes online from anywhere in Nigeria.

Website: https://www.mobileclassroom.com.ng
Mobile Application: https://bit.ly/MobileclassroomApp

In this example problem, we use an element's molar mass and Avogadro's number to convert from grams of an element to atoms of an element.

This crash course chemistry video tutorial explains the main concepts between ionic bonds found in ionic compounds and polar & nonpolar covalent bonding found in molecular compounds.

Chemistry - Basic Introduction: https://www.youtube.com/watch?v=-KfG8kH-r3Y

Unit Conversion Problems:
https://www.youtube.com/watch?v=eK8gXP3pImU

Physical Vs Chemical Properties:
https://www.youtube.com/watch?v=gH1R87ahFvA

Elements, Atoms, & Molecules:
https://www.youtube.com/watch?v=pSJeMJaCkVU

Protons, Neutrons, & Electrons:
https://www.youtube.com/watch?v=65dDZulPhtg

Average Atomic Mass:
https://www.youtube.com/watch?v=JT18bDAadQ0

___________________________________
Ionic and Covalent Bonding:
https://www.youtube.com/watch?v=uDFLHTDJ4XA

Naming Molecular Compounds:
https://www.youtube.com/watch?v=3agUL7-ezXk

Memorize The Polyatomic Ions:
https://www.youtube.com/watch?v=FXBEh7nd9KQ

Writing Formulas - Molecular Compounds:
https://www.youtube.com/watch?v=KrJnnwLDY6o

Naming Ionic Compounds:
https://www.youtube.com/watch?v=5rSgduXqhhU

_____________________________________
Naming Transition Metal Compounds:
https://www.youtube.com/watch?v=eM5mDnQX0k8

Writing Formulas - Ionic Compounds:
https://www.youtube.com/watch?v=GJ4Mds0CWLE

Writing Formulas - Polyatomic Ions:
https://www.youtube.com/watch?v=stu2omPRvbs

Naming Acids In Chemistry:
https://www.youtube.com/watch?v=r7PfTMAFYgs

Introduction to Moles:
https://www.youtube.com/watch?v=EowJsC7phzw

_____________________________________
Final Exams and Video Playlists:
https://www.video-tutor.net/

Full-Length Videos and Worksheets:
https://www.patreon.com/MathSc....ienceTutor/collectio

A unit is a frequently arbitrary designation we have given to something to convey a definite magnitude of a physical quantity and every quantity can be expressed in terms of the seven base units that are contained in the international system of units. Hank thinks this is a thrilling subject, and while you may not agree, it is a subject that is very important if you want to be a scientist and communicate with accuracy and precision with other scientists. So listen up and learn something or Hank might have to kill you! (NOT REALLY!)

Watch this video in Spanish on our new Crash Course en Español channel! https://youtu.be/aMrxhohbkVA

Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!
Download it here for Apple Devices: https://apple.co/3d4eyZo
Download it here for Android Devices: https://bit.ly/2SrDulJ

Table of Contents
Unit Conversion 02:27
Scientific Notation 03:26
Sig Figs 07:40

Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse

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View full lesson: http://ed.ted.com/lessons/the-....genius-of-mendeleev-

The elements had been listed and carefully arranged before Dmitri Mendeleev. They had even been organized by similar properties before. So why is Mendeelev's periodic table the one that has endured? Lou Serico explains via eka-aluminum, an element whose existence Mendeelev predicted years before it was discovered.

Lesson by Lou Serico, animation by TED-Ed.

This is a chemistry 101 video on atoms: What are atoms? The world is made of 92 different kinds of atoms.

Subscribe to watch more online chemistry courses & science videos:
http://www.youtube.com/channel..../UCiX8pAYWBppIbtUZTf

About Atomic School:
Atomic School supports the teaching of Atomic Theory to primary school & science students .
We provide lesson plans, hands-on classroom resources, demonstration equipment, quizzes and a Teacher's Manual to primary school teachers. Animated videos that clearly explain the scientific ideas supports learning by both teachers and students. As a teacher, you don't have to look anywhere else to implement this program.

Our work has been verified by science education researchers at the University of Southern Queensland, Dr Jenny Donovan and Dr Carole Haeusler, who confirm that primary students are capable of learning much more complex scientific concepts than previously thought, and crucially, that they love it. Students run to class!

The program has been trialed in Australian schools as well as high schools in the Philippines, Iran and India. It is conducted as holiday workshops at the Australian Nuclear Science and Technology Organisation, the Queensland Museum as well as the World Science Festival.
It has attracted wide media interest, including TV, radio and print, and the research data has been presented at prestigious American Education Research Association and Australian Science Education Research Association conferences.

Atomic Theory underlies all the other sciences- genetics, electronics, nanotechnology, engineering and astronomy- so an early understanding will set them up for a more successful learning sequence for all their science subjects, and support their mastery of mathematics as well. We also have extension programs that cover Biology, Physics and Astronomy to an equal depth.



About Ian Stuart (Email: ian.douglas.stuart@gmail.com):
The founder of Atomic School, Ian Stuart, taught Chemistry and Physics for 25 years at senior levels before he realized that his 8-year old son, Tom, could understand Atomic Theory at a much deeper level than he expected. After visiting Tom's class at school, he discovered that his peers could also grasp the abstract scientific concepts, as well as apply it usefully to the real world.

Ian then developed a program to teach the advanced concepts of high school Chemistry, Physics and Biology to students 10 years younger than they normally would. He found that this engaged their interest in modern science early, and sustained it through to high school and beyond. It also sets them up for future success in their academic and career paths.

Ian has a Bachelor's Degree in Chemistry from the University of Queensland and a Master's degree in Electrochemistry from the University of Melbourne.



Connect with Atomic School on social media:
http://facebook.com/AtomicSchool

http://twitter.com/AtomicSchools
http://instagram.com/AtomicSchools


Video transcript:
From a distance, a beach looks like one big smooth thing. But if we look at it through a telescope, we can magnify it and make it look bigger. Now we can see that the beach is not smooth at all, and it's not a single thing. It's made up of a lot of little sand grains. The beach is nothing but all the little sand grains put together. 12. A beach can be made of a thousand TRILLION sand grains.
It's an example of a big thing being made of lots of little things. We could say that the sand grains are the basic building blocks of the beach. How about a forest made of lots of trees? Here's a forest up close, and here's a forest on a distant mountain. Is this Lego parrot just one thing?
We can say that bricks are the basic building blocks of the hut, or that sand grains are the basic building blocks of the beach. But are bricks or sand grains themselves made of anything smaller?
To answer this question we can magnify a sand grain to see what it's made of. Scientists magnify really small things using a microscope, which will make the sand grain look bigger. The most powerful kind is called an electron microscope which can make things look millions of times bigger, so let's use that. Our scientist puts some sand under the microscope and now she looks through the top to see the magnified sand. Here's what she sees when she zooms in. This is what she sees, and now she is zooming in more. Magnifying the sand grain a million times would let her see the sand's building blocks.
Wow, look at those. These marble-shaped particles are the building blocks of the sand. They're called atoms. The word atom means uncuttable, and if you imagine we had a very sharp knife, we could cut the sand into smaller and smaller pieces, but we couldn't make it smaller than an atom because this is the sand's smallest piece. A tiny sand grain is made of 10 million, TRILLION atoms

This video provides a basic introduction for college students who are about to take the 1st semester of organic chemistry. It covers topics such as polar and nonpolar bonds, ionic & covalent bonding, alkanes, alkenes, alkynes, bond length, bond strength, sigma & pi bonds, hybridization, formal charge, functional groups and drawing lewis structures.

Access The Full 1 Hour 42 Minute Video:
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Direct Link to The Full Video on Patreon:
https://bit.ly/3k8oRUW

Organic Chemistry PDF Worksheets:
https://www.video-tutor.net/orgo-chem.html

_______________________________________
Full 1 Hour 42 Minute Video on YouTube:
https://www.youtube.com/watch?v=jxvU_GH3mWo

IUPAC Nomenclature:
https://www.youtube.com/watch?v=TYU_JluleME

Join The YouTube Membership Program:
https://bit.ly/46xaQTR

Hank gives us a tour of the most important table ever, including the life story of the obsessive man who championed it, Dmitri Mendeleev. The periodic table of elements is a concise, information-dense catalog of all of the different sorts of atoms in the universe, and it has a wealth of information to tell us if we can learn to read it.

Watch this video in Spanish on our Crash Course en Español channel! https://youtu.be/AmOl0v_3jsc

Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!
Download it here for Apple Devices: https://apple.co/3d4eyZo
Download it here for Android Devices: https://bit.ly/2SrDulJ

Table of Contents
Dmitri Mendeleev - 0:45
Mendeleev's Organization of the Periodic Table - 2:31
Relationships in the Periodic Table - 5:03
Why Mendeleev Stood Out from his Colleagues - 7:09
How the Periodic Table Could be Improved - 8:28

More info about the cylindrical periodic table of elements: http://www.av8n.com/physics/periodic-table.htm

Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse

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Whacky colour changes, magic disappearing water, blowing up dustbins, clouds of steam, thunder air explosions. Are you ready to fasten your seatbelts and enjoy the ‘explosive’ journey?

In his talk, Andrew aims to promote chemistry as the science of remarkable changes, which are often overlooked yet so important in our everyday life. And he does it brilliantly by performing an incredible series of 25 experiments in 15 minutes, totally amazing the audience (who rewards him with a long and deserved standing ovation)!

Andrew Z. Szydło is an internationally acclaimed chemistry teacher. But he’s definitely not the typical chemistry teacher you would expect…

He holds a PhD in the History and Philosophy of Science from UCL, and is an expert on the history of alchemy (his 1994 book ‘Water Which Does Not Wet Hands’ is considered to be the standard reference work on the Polish alchemist Michael Sendivogius.)

But his polymath spirit extends further: he’s a violin, bugle and accordion player, as well as a professional photographer. Throughout the years Andrew has wowed audiences all around the world with his pyrotechnical approach to teaching and demonstrating chemical sciences on stage and has appeared many times on TV. This talk was given at a TEDx event using the TED conference format but independently organized by a local community. Learn more at https://www.ted.com/tedx

Follow us at https://www.facebook.com/AtomicSchool, https://www.instagram.com/AtomicSchools/ and https://twitter.com/atomicschools

Check out how the the Periodic Table is connected to Atomic Structure (protons, electrons and neutrons) at https://youtu.be/3_FJIpKgdV4.

Also check out how protons, electrons and neutrons were discovered at https://youtu.be/kBgIMRV895w.

Introduction video on the periodic table being explained to chemistry school & science students . The video explains how there are 92 naturally occurring elements, one for each kind of atom, and how they are arranged into a table according to their relative weights.

The expanded table is shown, and how this is abbreviated into the common Periodic Table. The division between metals, semi-metals and non-metals is discussed, with notable examples.
It also shows how the elements are arranged in rows and groups, the latter containing elements with similar properties, like members of a family.

Subscribe to watch more online chemistry courses & science videos:
http://www.youtube.com/channel..../UCiX8pAYWBppIbtUZTf

About Atomic School:
Atomic School supports the teaching of Atomic Theory to primary school & science students.

Our work has been verified by science education researchers at the University of Southern Queensland, Dr Jenny Donovan and Dr Carole Haeusler, who confirm that primary students are capable of learning much more complex scientific concepts than previously thought, and crucially, that they love it. Students run to class!

The program has been trialed in Australian schools as well as schools in the Philippines, Iran and India. It is conducted as holiday workshops at the Australian Nuclear Science and Technology Organisation, the Queensland Museum as well as the World Science Festival.
It has attracted wide media interest, including TV, radio and print, and the research data has been presented at prestigious American Education Research Association and Australian Science Education Research Association conferences.

Atomic Theory underlies all the other sciences- genetics, electronics, nanotechnology, engineering and astronomy- so an early understanding will set them up for a more successful learning sequence for all their science subjects, and support their mastery of mathematics as well. We also have extension programs that cover Biology, Physics and Astronomy to an equal depth.

About Ian Stuart (Email: ian.douglas.stuart@gmail.com):
The founder of Atomic School, Ian Stuart, taught Chemistry and Physics for 25 years at senior levels before he realized that his 8-year old son, Tom, could understand Atomic Theory at a much deeper level than he expected.

Ian then developed a program to teach the advanced concepts of high school Chemistry, Physics and Biology to students 10 years younger than they normally would. He found that this engaged their interest in modern science early, and sustained it through to high school and beyond. It also sets them up for future success in their academic and career paths.

Ian has a Bachelor's Degree in Chemistry from the University of Queensland and a Master's degree in Electrochemistry from the University of Melbourne.

Connect with Atomic School on social media:
http://facebook.com/AtomicSchool

http://twitter.com/AtomicSchools
http://instagram.com/AtomicSchools


Video transcript:
In the first video we saw that all the things in the world are made of incredibly tiny particles called atoms. And also that there are 92 different kinds of them. Most things have more than one type of atom in them, but when we do find something containing just one kind of atom, we call it an element. A nugget of gold is an element because it's made of only gold atoms.
The atoms are too small to see with our eyes, even using a good microscope, but if we could zoom in with a magnification of a billion times we could see the individual gold atoms. Each kind of atom had a shorthand way of writing it, called its symbol, using either one or two letters. The symbol for gold is Au, taken from the ancient Latin word it, aurum. The symbol Au could refer to either a single gold atom, or the element gold consisting of many gold atoms.
Scientists have made a list of all the types of atoms, starting with the lightest, hydrogen, followed by the next lightest, helium. Just heavier than these are lithium and beryllium. We could give each element a number showing its place in this list. Hydrogen's number would be 1 as it is the first in the list, helium's would be 2, and so on. Here are the first 20 elements in the list, starting with the lightest, hydrogen, and going all the way to the heaviest, uranium. Since there are 92 elements in the list, uranium's number must be 92

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In this lesson, you will learn about the periodic table and how it is used in chemistry. We will focus on how the periodic table is organized by atomic number, and discuss how properties of elements are periodic in nature throughout the table due to the electrons in the outer shells of the atoms. We will also discuss atomic mass and valence electrons, including predicting when an atom will gain or lose an electron in a chemical reaction..

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Chemistry 101 · 9th Wonder · Buckshot

Chemistry

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Released on: 2005-07-12

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This video explains how the structure of the atom is directly responsible for the shape of the Periodic Table, and allows scientists to read the personality of each kind of atom due to its position. Protons, electrons, and neutrons explain everything about how an atom works and the making of the periodic table itself.

00:15 Scientists J J Thompson (1897), E Rutherford (1907) and J Chadwich (1932) discovery
00:25 Smaller particles: Positively charged protons and electrically neutral neutrons in the center called nucleus
00:51 The Nucleus
01:23 The atom is mainly empty space
01:46 Henry Moseley (1913) discovered that Atomic Number = Number of Protons
02:32 Number of protons = Number of electrons (in a neutral atom)
03:10 Isotopes
03:25 Atomic Mass Unit AMU
04:30 Neutorns have a big effect on the atomic weight but do not matter much in making chemical bonds
04:50 Electron Shells
05:15 Electrons are like guests in a hotel
06:20 Quantum Jump
06:38 Valence Electrons
07:00 Hydrogen
07:35 Helium
08:15 The Periodic Table
08:22 Lithium
08:52 Beryllium
09:00 Boron
09:17 Carbon
09:23 Nitrogen
09:30 Oxygen
09:35 Fluorine
09:39 Neon
09:55 Third shell
10:00 Sodium
10:30 Magnesium
10:40 Alkaline Earth Metals - the same number of valence electrons
11:53 Period 3
13:20 They can explain almost all of chemistry
13:38 Periodic Table Trends
14:00 Next video URL:

Video transcript:
“
To explain how atoms behave, we need to look inside them.
About a hundred years ago scientists discovered that atoms aren’t like tiny solid marbles as they thought, but made of three much, much smaller particles - positively charged protons and electrically neutral neutrons in their centre, called the nucleus, and negatively charged electrons orbiting on the outside in shells. See our video about how scientists discovered protons, electrons and neutrons at the link in the descrIption:
https://www.youtube.com/watch?v=kBgIMRV895w

THE NUCLEUS
The nucleus is much smaller than shown here in the diagram. If an atom were the size of a football stadium, then its nucleus would be the size of a pea. This means the atom is mostly empty space. And so are YOU.
Even though the nucleus is tiny, it makes up over 99.9% of the atom’s mass. That’s because protons and neutrons are 2 thousand times heavier than electrons. So they don’t matter much.
In 1913, Henry Moseley discovered that an element’s Atomic Number was always the same as the number of protons in its nucleus. What a coincidence! This is now the modern definition of Atomic Number.
This atom has 5 protons so its Atomic Number is 5. This is the number above the element’s symbol on the PT. Which element is it? …. Boron.
In an electrically neutral atom, the number of positive Protons must equal the number of negative electrons so that their charges cancel. So a boron also has 5 electrons. The job of neutrons is to overcome the proton-proton repulsions, and to keep the nucleus together. Most boron atoms use 6 neutrons to stabilize their nuclei, but some can get away with 5. The number of neutrons can vary between atoms of the same kind, so scientists give these a special name- isotopes. So boron has two! isotopes.
Protons and neutrons both have a mass of about 1 atomic mass unit, or amu, or just u, or even the Dalton. They all mean the same thing, which is a bit annoying. Call me old fashioned, but I prefer amu. Scientists use this tiny mass unit for atoms as grams or pounds are too big. Electrons weigh hardly anything. So the atom’s mass is just the sum of its protons and neutrons. Both boron's have 5 protons, so its 6-neutron isotope would weigh 11, and its 5-neutron isotope 10 amu. It’s Atomic Weight shown on the PT is 10.8 and is the average of its two isotopes. It’s is closer to 11 because it’s the more abundant one.
Neutrons have a big effect on Atomic Weight, but don’t matter much in making chemical bonds, which we’re interested in here. So we’ll just look at protons and electrons from now on. Bye, bye neutrons. And Atomic Weights.
ELECTRON SHELLS
The first electron shell can accommodate 2 electrons before it’s full, while the 2nd shell can accommodate up to 8. This is why boron has only 2 electrons in its 1st shell, and the remaining 3 electrons in the 2nd shell.
Electrons are like guests in a hotel. Here’s a normal hotel. And here’s the Quantum Hotel that better shows how electrons fit around an atom. The 1st floor can take 2 guests before it’s full, the 2nd floor also 8, the 3rd floor 8, and the 4th and 5th 18 each. When a floor is full a new arrival is sent to the next floor up. This guest on the 4th floor has more energy than the guests below, which she would find out if she jumped. When she lands, the energy she had turns into sound energy. Electrons in higher levels also have more energy, and when they jump down, light energy is emitted instead. This is called a quantum jump.
“

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.

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Chemistry PDF Worksheets:
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This is for those who are struggling to figure out how to self-study A Level H2 Chemistry. #singapore #alevels #chemistry

The entire field of chemistry summarised in 12mins from simple atoms to the molecules that keep you alive.

#chemistry #DomainOfScience

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Errata and notes:
1. I got the Oxidising Agent and the Reducing Agent the wrong way around! Sodium is the Reducing agent and Chlorine is the Oxidising agent. My confusion was that when a sodium atom looses an electron it becomes oxidised, so in my simple brain, I called it the oxidising agent. That is wrong because the agent that oxidises the sodium is the chlorine atom and so the labels are the wrong way around. Doh!
2. I drew the hydrogen H2 molecule with a double bond but it should be a single bond because they are bonded with a single covalent bond.
3. Where I have drawn carbon dioxide, the carbon should have a double bond to each of the oxygens.
4. Apparently Feynman diagrams are not that useful for theoretical chemistry, so perhaps that wasn't the best choice for the illustration. The feedback in the comments from a real theoretical chemist is "All we deal with is shuffling around electrons, but many many many electrons, so a Feynman diagram would need to be huge but at the same time would be very very repetitive."
5. In analytical chemistry, I should have called it distillation rather than precipitation.
6. My definition of organic chemistry being about ‘life’ is not very good. I should have said that organic chemistry looks at compounds that contain carbon. But there are some compounds in inorganic chemistry that also contain carbon, like carbon dioxide so I guess I'd also have to state that inorganic chemistry is almost everything else.
7. I said that fuels are inorganic chemistry which is misleading when I drew a car next to it. My understanding is that there are inorganic fuels that don't contain carbon, but obviously all the fuels we are familiar with are organic. I thought a picture of a car would tie a few things together elegantly, but it ended up giving the wrong impression. That’s okay, I’m still learning! :D
8. In inorganic chemistry, I should have stated that all natural minerals fall under inorganic chemistry so as not to be misleading, otherwise you might go way thinking that only man-made substances fall under inorganic chemistry which is not true. I said that 'a lot of the inorganic compounds that are studied are man-made' meaning that the cutting edge of research is mostly man-made substances.
9. Apparently water is not the most inflammable substance. I thought it was so that is interesting.
10. In the bonding section, hydrogen bonding and van der waals forces are technically inter molecular forces.

Here are some of the references I used for this video if you’d like to dig a little deeper
https://en.wikipedia.org/wiki/Chemistry
https://en.wikipedia.org/wiki/Outline_of_chemistry
https://www.uwlax.edu/chemistr....y-and-biochemistry/s
https://www.khanacademy.org/science/chemistry
https://www.cancerquest.org/ca....ncer-biology/biologi
Early smelting:
http://ispatguru.com/evolution....-of-blast-furnace-ir
Categorisation of reactions
http://www2.ucdsb.on.ca/tiss/s....tretton/chem1/stoich

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In this video we read about :----

introduction
sources of water
impurities in water
sources of impurities in water
and specification of water for different uses