Models are great, except they're also usually inaccurate. In this episode of Crash Course Chemistry, Hank discusses why we need models in the world and how we can learn from them... even when they're almost completely wrong. Plus, Lewis Structures!

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
Models 0:06
Linus Pauling & The Bonding Model 9:16
Lewis Dot Structures 4:27
Ionic Bonds 5:30
Covalent Bonds 6:10
Double Bonds 7:17
Triple Bonds 8:14

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

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Hank calls in a friend to do his push-ups for him today to explain how skeletal muscles work together to create and reverse movements. Hank and Claire also demonstrate the role size plays in motor units, the three-phase cycle of muscle twitches, and how the strength and frequency of an impulse affect the strength and duration of a contraction. This episode also explains twitch summation, tetanus, and isotonic vs. isometric movements.

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

Chapters:
Introduction: Heavy Lifting 00:00
How Muscles Push & Pull 1:13
Functional Muscle Groups: Prime Movers, Antagonists, and Synergists 2:27
Motor Units 3:49
3 Phases of Muscle Twitches: Latent, Contraction, Relaxation 4:41
Graded Muscle Responses 5:22
Temporal Summation vs Tetanus 6:19
Multiple Motor Unit Summation (Recruitment) 7:07
The Size Principle of Recruitment 7:52
Isotonic vs Isometric Movements 8:50
Review 9:28
Credits 9:59


***

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

Thanks to the following Patrons for their generous monthly contributions that help keep Crash Course free for everyone forever:

Mark Brouwer, Jan Schmid, Steve Marshall, Anna-Ester Volozh, Sandra Aft, Brad Wardell, Christian Ludvigsen, Robert Kunz, Jason, A Saslow, Jacob Ash, Jeffrey Thompson, Jessica Simmons, James Craver, Simun Niclasen, SR Foxley, Roger C. Rocha, Nevin, Spoljaric, Eric Knight, Elliot Beter, Jessica Wode

***SUBBABLE MESSAGES***

TO: Ariela
FROM: Gavi

I love you so much, stay awesome as always!

--

TO: Josiah P.
FROM: Amy P.

I love you!

***SUPPORTER THANK YOU!***

Thank you so much to all of our awesome supporters for their contributions to help make Crash Course possible and freely available for everyone forever:

Vanessa Benavent, Les Brown, John Hadfield, Damian Shaw, Burt G. Clothier & Tad A. Saine, Ashley Williamson, Carrie Williamson, Melissa A, Lopin Forsythe, Trevor Sacks

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In order to understand how we study the universe, we need to talk a little bit about light. Light is a form of energy. Its wavelength tells us its energy and color. Spectroscopy allows us to analyze those colors and determine an object’s temperature, density, spin, motion, and chemical composition.

Check out the Crash Course Astronomy solar system poster here: http://store.dftba.com/product....s/crashcourse-astron

--

Chapters:
Introduction 00:00
Light is a Wave 0:31
Electromagnetic Spectrum 1:32
How is Light Made? 3:19
Atomic Structure 4:47
Spectroscopy 7:14
Redshift vs Blueshift 8:26
Review 9:50

--

PBS Digital Studios: http://youtube.com/pbsdigitalstudios

Follow Phil on Twitter: https://twitter.com/badastronomer

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Support CrashCourse on Patreon: http://www.patreon.com/crashcourse

--

PHOTOS/VIDEOS
Wavelengths http://imagine.gsfc.nasa.gov/e....ducators/gammaraybur [credit: Imagine the Universe! / NASA]
Observatories across spectrum http://imagine.gsfc.nasa.gov/I....mages/science/observ [credit: Imagine the Universe! / NASA]
Red hot spiral hotplate http://freefoodphotos.com/imag....elibrary/cooking/sli [credit: freefoodphotos.com]
The Crab Nebula http://en.wikipedia.org/wiki/N....ebula#/media/File:Cr [credit: NASA, ESA, J. Hester and A. Loll (Arizona State University)]
Building the Space Telescope Imaging Spectograph http://imgsrc.hubblesite.org/h....u/gallery/db/spacecr [credit: NASA]
VST images the Lagoon Nebula http://en.wikipedia.org/wiki/L....agoon_Nebula#/media/ [credit: ESO/VPHAS+ team]
Jupiter http://www.nasa.gov/images/con....tent/414987main_pia0 [credit: NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute]
Venus http://en.wikipedia.org/wiki/A....tmosphere_of_Venus#/ [credit: NASA - NSSDC Photo Gallery Venus]
Ring Around SN 1987a, image 1 http://www.spacetelescope.org/images/opo9714e/ [credit: Jason Pun (NOAO) and SINS Collaboration]
Ring Around SN 1987a, image 2 http://www.spacetelescope.org/images/opo9714a/ [credit: George Sonneborn (GSFC) and NASA/ESA]

How can Daenerys Targaryen help us understand personal identity? Find out as Hank continues our exploration of personal identity, learning about Hume’s bundle theory and Parfit’s theory of survival through psychological connectedness.

--

Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios

Crash Course Philosophy is sponsored by Squarespace.
http://www.squarespace.com/crashcourse

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Want to find Crash Course elsewhere on the internet?
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In this REALLY IMPORTANT EPISODE of Crash Course Psychology, Hank talks about how we remember and forget things, why our memories are fallible, and the dangers that can pose.

Want more videos about psychology? Check out our sister channel SciShow Psych at https://www.youtube.com/scishowpsych!

--
Chapters:
Introduction: The Banana Thief 00:00
How Memories are Stored 1:12
Memory Retrieval Cues 1:58
Priming & Context-Dependent Memory 2:45
State-Dependent & Mood-Congruent Memory 3:31
Serial Position, Primacy, & Recency Effects 3:52
How Information is Forgotten 4:43
Interference & Misinformation 6:21
Issues with Eyewitness Accounts 7:02
Review & Credits 9:25
--

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

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After serial photography became a thing, it wasn't long before motion pictures started to develop. And, at the front of that development was Thomas Edison, who you may know as an inventor and business person. In this episode of Crash Course Film History, Craig talks to us about Edison, his assistant W.K.L. Dickson, and their inventions that pioneered motion pictures.

Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios

Want to know more about Craig?
https://www.youtube.com/user/wheezywaiter

The Latest from PBS Digital Studios: https://www.youtube.com/playli....st?list=PL1mtdjDVOoO

***

Images Used are in the Public Domain and from the Library of Congress.

***

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Ever feel like there's an international team of bad guys changing all of the easily remembered chemical names and turning them into test-failing, number-infused, pain-in-the-neck names? Well... you're not wrong. IUPAC exists, but try to keep in mind that they're doing it for the greater good. In this episode, Hank talks about IUPAC, prefixes, suffixes, ranking, numbers for carbon chains, and cis or trans double bonds.

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

Common Functional Groups: http://en.wikipedia.org/wiki/F....unctional_group#Tabl
--
Table of Contents

IUPAC 0:00
Every Organic Compound Has Only One Name 1:02
Prefixes 2:16
Suffixes 2:47
Ranking Functional Groups 4:18
Lowest Possible Numbers for Carbon Chains 1:54
Cis or Trans for Double Bonds 6:35
--

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https://paroleostili.it/en/
https://smileandlearn.com/

Social networking is one of the funniest things about Internet, but it's also important to be careful not to hurt other people's feelings. This video showcases a series of situations related to how we can stop cyberbullying. What would you do if someone shared an embarrassing photo of a friend? What if you used a rather unpleasant word while chatting to a friend and he got upset? Would you share personal information with a friend about someone? Virtual is real and words have consequences. Remember that our behavior is critical when it comes to standing against cyberbullying. Be a good friend, not a bystander, respect privacy, your actions can make a difference. And remember, if something bothers you and doesn't feel right, you can always tell an adult about it.

Thanks for visiting us! If you want your children to smile and learn, subscribe! :D

We only upload our own content, designed by educators so that children smile and learn while watching a video.

All of our content reinforces educational values, encouraging the use of multiple intelligences and language learning.

If you like our videos, download Smile and Learn now. You’ll discover more than 5.000 activities for children aged 3 to 12 years, all designed by educators. We have 250 games and interactive stories and over 280 videos in five languages: English, Spanish, Portuguese, Italian and French. Try a month for free and start the adventure!

Educational video which focuses on learning two consonant letter sounds: letter B and V. Children will learn to write, pronounce and differentiate between these two letter sounds. Excellent educational resource for preschool education teachers.

This video is part of a larger collection of videos with teaching material to learn the alphabet letters. Excellent resource for preschool education.

If you like our videos, download “The Smart Library” now. You’ll discover more than 200 interactive games and stories for children designed by educators. The stories are based on VALUES like friendship, respect, and generosity, and our games cover all of the MULTIPLE INTELLIGENCES. All our content is in SPANISH, ENGLISH, FRENCH, ITALIAN and PORTUGUESE.

www.smileandlearn.com

Educational video for children to learn how living things are classified into five different kingdoms: Animal, Plant, Fungi, Monera, Protista. Animals are multicellular beings, heterotrophic and almost all of them can move on their own. Whereas plants are multicellular beings, autotrophic and do not move on their own. Fungi can be both unicellular and multicellular, heterotrophic, and they do not move on their own. The Monera kingdom is characterized by the simplest and most primitive forms of life and is made up of unicellular organisms. In the Protista kingdom, also called Protoctista kingdom, the organisms can be unicellular, such as protozoa and many types of algae, or multicellular, like many other kinds of algae.

This is a very useful and interesting video resource for children to learn about the most important aspects of living things. It is an excellent video for early childhood education.

Thanks for visiting us! If you want your children to smile and learn, subscribe! :D

If you like our videos, download Smile and Learn now. You’ll discover thousands of activities for children aged 3 to 12 years, all designed by educators. We have hundreds of games, interactive stories and videos in five languages: English, Spanish, Portuguese, Italian, Turkish and French. Try a month for free and start the adventure!

www.smileandlearn.com

Kids educational video to learn geometric shapes, like the circle, triangle, square, rectangle, diamond and heart shapes, the cross, the star and the moon through countless super-fun examples. This video is part of a larger collection of videos on geometry for kids, which helps them learn all about geometric shapes and related vocabulary, while having fun. Excellent resource for preschool education.

Kids educational video to learn geometric shapes, like the circle, triangle, square, rectangle, diamond and heart shapes, the cross, the star and the moon through countless super-fun examples. This video is part of a larger collection of videos on geometry for kids, which helps them learn all about geometric shapes and related vocabulary, while having fun. Excellent resource for preschool education.

Thanks for visiting us! If you want your children to smile and learn, subscribe! :D

We only upload our own content, designed by educators so that children smile and learn while watching a video.

All of our content reinforces educational values, encouraging the use of multiple intelligences and language learning.

If you like our videos, download “The Smart Library” now. You’ll discover more than 70 interactive games and stories for children designed by educators. The stories are based on VALUES like friendship, respect, and generosity, and our games cover all of the MULTIPLE INTELLIGENCES. All our content is in SPANISH, ENGLISH, FRENCH, ITALIAN and PORTUGUESE.

The perfect tool to use in and out of school.

Download it today!

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-Google Play: https://play.google.com/store/....apps/details?id=net.

www.smileandlearn.com

Thank you for trusting us with your children's education!

This video was requested by a subscriber. If you have any math questions or topics you would like to see a video over, please leave them in the comments!

→ LINKS ←
TikTok ➭ https://www.tiktok.com/@homemademathematics/
Middle School Math TikTok Curriculum ➭ https://docs.google.com/docume....nt/d/1jeZ1koeIPoQc6I
Learn Algebra in 10 Days Series ➭ https://www.youtube.com/playli....st?list=PLKd0ju677V6
Algebra 1 TikTok Curriculum ➭ https://tinyurl.com/2p9vmxfb
Algebra 1 Shorts Playlist ➭ https://www.youtube.com/playli....st?list=PLKd0ju677V6
Algebra Lessons ➭ https://www.youtube.com/playli....st?list=PLKd0ju677V6
More Links ➭ https://linktr.ee/homemademathematics

#shorts #mathshorts #shortsvideo

Fractions -Addition, Subtraction, Multiplication, Division - भिन्नों का जोड़, घटाना, गुणा, भाग | Fractions for Competitive Exams in Hindi


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In this video you will learn the steps in subtracting mixed numbers with dissimilar fractions without regrouping.

Steps in subtracting mixed numbers with dissimilar fractions without regrouping:
1. Change the dissimilar fractions to similar fractions.
2. Subtract the numerators
3. Subtract the whole numbers
4. Copy the LCD
5. Express the answer in lowest term

#subtractionofmixednumbers #Mathtutorials
#FilKoreanTV

Please watch the other tutorial videos by clicking the link below.

How to Reduce Fractions to Lowest Terms
https://youtu.be/337DIwfv_mk

How to add mixed numbers with the same denominators
https://youtu.be/jk6nYx-I408

How to Add Dissimilar Fractions https://youtu.be/1uo3Wps9cGI

How to Add Similar Fractions https://youtu.be/sQM67aoR4u0

How to Solve Equations Involving Different Operations
https://youtu.be/jxgPerdbMaM

How to Find the Greatest Common Factor
https://youtu.be/aJD6I71vJcU


Thank you so much for watching.
Please subscribe in our channel.
God bless

How to subtract mixed fractions
How to subtract mixed numbers with dissimilar fractions
How to subtract mixed numbers with dissimilar fractions without regrouping
How to subtract mixed numbers with dissimilar fractions without regrouping
how to subtract mixed numbers without regrouping
Steps in subtracting fractions
Steps in subtracting dissimilar fractions
Process in subtracting fractions
Process in subtracting dissimilar Fractions
How to subtract fractions with unlike denominators
How to Subtract fractions with different denominators
How to reduce fractions to lowest terms
Reducing fractions to lowest terms
Math tutorials
Tutorials in Math
online tutorials in Math
online Math tutorials

👉 Learn how to solve two step linear equations. A linear equation is an equation whose highest exponent on its variable(s) is 1. To solve for a variable in a two step linear equation, we first isolate the variable by using inverse operations (addition or subtraction) to move like terms to different sides of the equality sign. After evaluating like terms we then also use inverse operations (multiplication or division) to remove any multiple (or fraction) to the variable.

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Organized Videos:
✅Solve One and Two Step Equations
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅Solve Linear Equations | Learn About
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅How to Solve One Step Equations with Addition
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅How to Sove One Step Equations with Multiplication
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅How to Solve One Step Equations with Decimals
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅Solve Two Step Equations
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅Solve Two Step Equations with Fractions
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅Solve Two Step Equations with Two Variables
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅Solve Two Step Equations with a Fraction
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅Solve Two Step Equations with Fractions
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅Solve Two Step Equations with a Rational Fraction
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM


🗂️ Organized playlists by classes here: https://www.youtube.com/user/M....rBrianMcLogan/playli

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👨‍👩‍👧‍👧 About Me: I make short, to-the-point online math tutorials. I struggled with math growing up and have been able to use those experiences to help students improve in math through practical applications and tips. Find more here: https://www.freemathvideos.com/about-me/

#LinearEquations #SolvelinearEquations #Brianmclogan

Welcome to Multiplying Whole Numbers by Fractions Using Models with Mr. J! Need help with how to multiply whole numbers and fractions using models? You're in the right place!

Whether you're just starting out, or need a quick refresher, this is the video for you if you're looking for help with how to model multiplying fractions and whole numbers. Mr. J will go through examples of modeling whole number by fraction multiplication and explain the steps of how to draw a model for multiplying fractions with whole numbers.

✅ Here is a video on multiplying fractions by fractions models:
https://youtu.be/B366S2aYgzU

About Math with Mr. J: This channel offers instructional videos and mastery checks (practice videos to gauge understanding) that are directly aligned with math standards (4th grade, 5th grade, 6th grade, etc.). Videos can be used to introduce content, reteach content, or as a study tool. Teachers, parents/guardians, and students from around the world have used this channel to help with math content in many different ways. All material is absolutely free.

Click Here to Subscribe to the Greatest Math Channel On Earth: https://goo.gl/XHTrfY

Follow Mr. J on Twitter: @MrJMath5

Email: math5.mrj@gmail.com

Music: https://www.bensound.com/royalty-free-music


Hopefully this video is what you're looking for when it comes to multiplying whole numbers and fractions using models.

Have a great rest of your day and thanks again for watching!

This algebra video tutorial shows you how to solve systems of equation by elimination with 2 and 3 variables even if the equation contains fractions.

Systems of Linear Equations - 2 Variables: https://www.youtube.com/watch?v=oKqtgz2eo-Y

Systems of Equations - Fractions & Decimals:
https://www.youtube.com/watch?v=jlddJQ1qYDU

One Solution, No Solution or Many Solutions?
https://www.youtube.com/watch?v=bq5gDsEdN3Q

Systems of Equations - Substitution Method:
https://www.youtube.com/watch?v=cblHUeq3bkE

Solving Systems of Equations By Graphing:
https://www.youtube.com/watch?v=Pd4hwS8qHms

________________________________________
Systems of Linear Equations - 3 Variables:
https://www.youtube.com/watch?v=0JQeo0yC9OQ

Systems of Equations - Word Problems:
https://www.youtube.com/watch?v=YgtidDkjJ9M

Systems of Quadratic Equations:
https://www.youtube.com/watch?v=rq5AjFs95qw

Systems of Nonlinear Equations:
https://www.youtube.com/watch?v=JPdLEaxlnZQ

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

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

#MathIsSimple #Grade7 #Fractions #Equations #Algebra
Solve Equations with Fractions| Expressions & Equations | Grade 8

Like to learn more math problems from Middle School to Algebra on Math is Simple!,
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More Lessons: http://www.MathAndScience.com
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In this lesson, you will learn how to solve percent problems using the fraction representation of a percent. A percentage literally means "per 100", so every percent can be expressed as a fraction. This fraction representation can be used to calculate percentages of numbers. Here we multiply by the fraction to obtain the percent of the number, and discuss what the percent means in real life examples.

How to Add Mixed Numbers Fast | Adding Mixed Fractions Simplified | Math Tricks | Ms. Riaz Academy

In this short video, I will show you how to add mixed numbers fast!

SUBTRACT FRACTIONS in 9 SECONDS!
https://youtu.be/REC5aAUpG7U


___________________

If you need help with homework, exams, or online learning, check out these resources:

Fractions
https://youtube.com/playlist?list=PLc...

Grade 7 Math
https://youtube.com/playlist?list=PLc...​

Pre-Algebra | Equations
https://youtube.com/playlist?list=PLc...​

Math 7 - Integers
https://youtube.com/playlist?list=PLc...​

DIY Science Experiments
https://youtu.be/7fDBTfImAGQ

Grade 9 General Chemistry (Unit B)
https://www.youtube.com/playlist?list...​

Grade 9 Electricity (Unit D)
https://www.youtube.com/watch?v=NtMoO...​

Ionic vs. Molecular
https://www.youtube.com/playlist?list...​

Grade 10 Math
https://www.youtube.com/playlist?list...​

Trigonometry Introduction
https://www.youtube.com/playlist?list...​

Grade 10 Chemistry
https://www.youtube.com/playlist?list...​

Organic Chemistry Introduction
https://www.youtube.com/playlist?list...​

Esters
https://www.youtube.com/playlist?list...​

Carboxylic Acids
https://www.youtube.com/playlist?list​...

Alcohols
https://www.youtube.com/playlist?list...​

Cyclic Compounds / Cycloalkanes
https://www.youtube.com/playlist?list...​

Alkenes
https://www.youtube.com/playlist?list...​

Alkanes
https://www.youtube.com/playlist?list...​


________________________________________________________________

Facebook:

https://www.facebook.com/pg/Ms-Riaz-A...​

👉 Learn how to add and subtract mixed numbers. Mixed numbers are numbers with two parts: the whole number part and the fraction part. Mixed numbers are ways to represent improper fractions using proper fractions.

To add or subtract mixed numbers, we first convert the mixed numbers to improper fractions by multiplying the whole number with the denominator and adding the result to the numerator, this becomes the new numerator and we retain the original denominator. After we have converted the mixed numbers to improper fraction we can now add or subtract the fractions.

Alternatively, we can split the mixed numbers and add the whole number parts separately and the fraction parts separately and then join the results.

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Organized Videos:
✅Add and Subtract Fractions
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅Learn About Fractions
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅Add and Subtract Fractions with Like Denominators
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅Add and Subtract Fractions with Unlike Denominators
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM
✅Add and Subtract Mixed Numbers
https://www.youtube.com/playli....st?list=PL0G-Nd0V5ZM

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✅ Thanks for checking out that quick review of how to subtract fractions with unlike denominators. ✌️✌️✌️

✅ Click the link for a more detailed explanation and more examples: https://youtu.be/WpvdfVNXAPU

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