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rhosinthorn

The Four Chemistry Classes You Might Take in College

Because apparently my descriptions of chemistry are apparently amusing to @papalogia

Gen Chem: A mix of “hey I learned this in high school, this ain’t so bad”, “they lied about this in high school but it makes a bit more sense now”, and “I have never seen this before, but let’s roll with it.”

Organic Chem: You hate carbon. You hate bonds. You hate stereochemistry. You may or may not hate reactions, depending on if that makes sense to you. If you can’t imagine molecules, you hate your life.

Inorganic Chem: This isn’t organic! It makes sense! And then you get to Molecular Orbital diagrams and you cry a bit. Or a lot, depending on if you get them right away. Or at all.

Physical Chemistry: The bastard hell child of physics and chemistry. It has no soul, and you will come out of it hating every sentence that contains the words “particle” and “box” together. If your calculus skills aren’t up there, you will cry in frustration. If your calculus skills are up there, you will cry, but it will be out of joy. You may not know what’s going on, but you just solved an equation, so that’s something.

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Anonymous asked:

I have been reading quite a bit into quantum physics lately, and I have heard the term "entropy" thrown around a few times. Could you explain this in a relatively understandable way?

This is my own take on it.

Let’s say that you’ve got a bunch of balls, in an empty room. These balls can be in different configurations: all in one corner, or aligned through the floor, or in the center of the room, etc.

Between all of those configurations, there are certain arrangements that look less “localized”. For instance, when all the balls are in one corner, that can be said of only one corner and the rest of the room does not have the same density of balls.

When all balls are spread through the floor, there is more volume of the room with the same density of balls (the floor), but you cannot say the same of the rest of the room above.

If you had them all equally spaced, all the room would be in the same “configuration”, and dividing it in pieces would only look like miniature versions of that whole configuration.

Intuitively, in these examples we’ve been increasing how “spread out” the balls were. If we consider the balls to represent some kind of energy (any kind) and our room to be a closed system, then we can measure these comparisons with entropy.

So entropy will be the energy distribution in the system, which also correlates to the chance of this distribution be given by how “random” indistinguishable states are (i.e. how “common” is to find such state among any other possibility).

That’s why some people call entropy a measure of “disorder” (SOMEWHERE BETWEEN THE SACRED SILENCE…), but it is a little bit more than that. In the context of thermodynamics, it’s more about energy.

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notes masterpost

Hi! OMG IM FINALLY DONE POSTING ALL MY NOTES HAHAH FINALLLYYYY!!!!

I understand it’s pretty hard to collate all my notes together, so I’ve made this masterpost!! :) + some abbreviation legend thing just in case you guys don’t understand the abbreviations i wrote hehe i hope you guys enjoyed these and that these notes helped!! thank you for sticking by me and my irregular posting schedules. Will continue to update this list when i post more notes in the future !!! xx

Biology Notes - based on Biology Matters for GCE ‘O’ Level (2nd Edition), by Marshall Cavendish

Chemistry Notes - based on Chemistry Matters for GCE ‘O’ Level (2nd Edition), by Marshall Cavendish

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heyyyy! You’re learning german? Cool!! German is my mother language so maybe I can help you with some media for improving your german. v cool and up to date.

MUSIC

  • german rap. hugeee scene. from ghetto to deep
  • germany also has pop music
  • do you know “schlager”? don’t listen to it.

my fav artists 

  • CRO (v good, pop & rap)
  • Marteria
  • SXTN (girl power yea)
  • Knontra K
  • Mark Forster

spotify playlists

BOOKS

  • don’t read the classics if ur german isn’t v good. even I sometimes don’t understand them so
  • Marah Woolf & Kersin Gier write ya literature & are one of my favorite authors
  • try the german trans of books you already read
  • “Die Seiten der Welt”

MOVIES / TV SHOWS

  • “Luke, die Woche und ich” is a comedy show & very funny (he’s also a youtuber)
  • watch german news
  • “Fack ju Göhte” (u won’t regret it)

YOUTUBE

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Some general resources:

Resources for specific topics:

Textbooks:

Chemistry Tutorials/Guides:

Organic Chemistry Tutorials/Guidelines:

Careers:

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Anonymous asked:

how do you study math and physics? i rarely get good scores for those subject *sigh*

hiii! these are a few masterposts I previously bookmarked! 

Sorry there isn’t much on physics, I don’t take the subject! Hope this helps! Good luck with everything c:

Sarah :)

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emmastudies
Anonymous asked:

Hello, I'm taking AP Physics in the upcoming year and I was wondering if you could recommend any books, resources or tips to make the experience slightly easier. Thank you

Hi! I haven’t studied for AP or physics so I’d struggle to give you personalise tips but these posts might help:

If anyone has any suggestions, please reply to this x

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General Tips

  • Know how to read a period table. 
  • Print out a periodic table for your own use. Place it somewhere in your binder for easy access. 
  • Know how to determine the number of valence electrons for an atom from the periodic table. Oxidation numbers? Yeah, those too.
  • Know certain elements mass number by heart so you don’t have to constantly look back to see what the mass of hydrogen (H), oxygen (O), etc. is
  • Know periodic trends like increase in electronegativity, etc.
  • Read the material before class starts. This makes it easier for you to follow through lecture and ask questions about things you are not clear about.
  • Take good lecture notes. If your teacher posts his/her lectures online, I would advice you to print these out before class, read through them and take notes on them. 
  • Read your lecture notes once again after class to keep the stuff fresh in your mind. 
  • Focus on key concepts and how to apply them. 
  • Do not memorize! If you don’t understand the concept well enough, memorizing will not be helpful at all. 
  • Learn these by heart:
  • formulas and names of common polyatomic ions
  • solubility rules (including the exceptions)
  • common acids and bases (including their strength). 
  • gas forming reactions
  • molecular geometry shapes
  • Check that your equation is balanced before anything else. Nothing screws up a stiochemetry question, and loosing easy points like unbalanced equations.
  • Scientific notation will screw you over if you don’t know them. 
  • Write the equation out! It’s easier to figure out how the reaction works when you visualize it. Especially if you’re trying to figure out which one is the oxidation agent, reduction agent, etc.
  • Practice makes perfect. Go through every question in your textbook + external questions. Know the question type, how to approach it, etc. The more familiar you are with the types of questions, the easier the class will be.
  • Be familiar with mnemonic devices. 
  • OILRIG = oxidation is losing electrons, reduction is gaining electrons
  • Know basic math such as addition/subtraction, multiplication/division, logarithms. General Chemistry is math heavy. 
  • Make a “cheat sheet”/ “index card of information” for yourself. Your cheat sheet should consist of formulas, numbers you might need to know (Avogadro’s number, standard pressure, etc.) and concepts.
  • Utilize your professor’s office hours and free tutoring services! 

Other Resources

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noteology

Welcome back! Today’s post was requested by one of my followers earlier, so if you’re struggling with a particular subject you’d like advice on, please send me a request and I’ll try my best to get a post out in a timely manner. Now without further ado, I’ll teach you how to take notes and efficiently study for the mother of all necessary evils, math class.

TAKE GOOD NOTES

It can be difficult to take notes during fast-paced math classes. However, remember that you shouldn’t (and probably can’t) copy down every single little thing that was said. After all, you’re a student, not a court stenographer. Ignore all of the filler information and focus on getting down two things: formulas/theorems and example problems.

Formulas/theorems:

Mark these with something noticeable (stars, boxes, highlighting, etc) so you can easily find and reference them later.

Simplify theorems so you can understand them. For example, this is the binomial theorem written formally:

Looks intimidating, right? Would you still understand what that means two weeks after the lesson, when you’re studying for a test? Instead of attempting to decipher and memorize that confusing chain of hieroglyphics variables, break it down for yourself into straightforward language. You might say to yourself, “Oh, so it looks like the exponent of x starts at 0 and increases by 1 every term until it reaches n. And vice versa, the exponent of y starts at n and decreases by 1 every term until it reaches 0. And the coefficient of each term is just n choose k, where k increases by 1 every term.” Better, right? Put theorems and definitions into your own words to make them much more tangible and graspable.

Similarly, aim for understanding, not memorization. Try to write a proof for every formula/theorem. If you don’t cover the proofs in class, I highly encourage you to try to prove them yourself. There are also tons of great proofs on the Internet you can search for if you get stuck. Also make sure you know when to apply each concept. Memorizing the quadratic formula is peachy and all, but if you don’t know that the formula can only be used for a quadratic in standard form that’s set equal to 0, you’re going to run into some issues. Understanding the reasoning and applications for what you learn will tremendously improve your retention of all those complicated formulas as well as challenge you to think outside of the box.

Example problems:

If you’re really, really rushed, just copy the problem and answer. You can fill in everything in between later.

Ideally though, you’ll want to show your work. It’s helpful to add short comments next to each step to explain what you did and why you did it (“u-substitution”, “multiplied by denominator to cancel terms”, “subtracted 7x on both sides to use Zero Product Property”). Don’t show each itty bitty step if you don’t need it, but write down enough so that you could follow your train of thought if you were to look back at these notes come finals season.

Lastly, make sure to include units with all of your answers, follow any conventions your teacher tells you to (rounding to a certain decimal place, rationalizing denominators, etc), and always use correct notation. Develop these habits now so you won’t be kicking yourself for forgetting to include units on a test, when it actually matters.

After class:

At the end of class or as soon as possible afterwards, quickly review your notes and fill in clarifications, corrections, or explanations you missed while everything is still fresh in your memory.

PRACTICE, PRACTICE, PRACTICE!

They say that math isn’t a spectator sport, and they’re right. In other subjects, you might be able to get away with passively sitting back and hoping something the teacher says will work its way into your brain. But in math class, flipping through your textbook will not help you. Highlighting your formulas in different color schemes will not help you. Watching Sal Khan solve problems on YouTube without picking up a pencil yourself will not help you.

The only way to become a successful math student is to be actively involved in solving as many practice problems as you can get your hands on.

So where can you find practice problems?

  • your homework problems
  • your textbook
  • any problem sets or worksheets you recieve in class
  • the Internet, especially Khan Academy, IXL, and Kuta Software
  • if you ask your teacher nicely, I’m sure he/she will direct you to some helpful resources
  • if your school has two or more teachers who teach the same level math and use different problems, see if you can get extra worksheets from the other teacher/a friend in the other class
  • you can use problems from smaller quizzes and tests to prepare for midterms and finals

While working through the practice problems, simulate test conditions as much as possible. Close your textbook and notes. Put away your calculator, unless you’re allowed to have one on test day. Show all appropriate work and use correct notation for each problem. Maybe even set a timer for yourself if you’re someone who tends to work too slowly.

If you have an answer key, check all your answers at the end. If you get a problem wrong, attempt to solve it at least one more time before asking for help (see section below).

ASK FOR HELP (THE RIGHT WAY)

You can get math help from your friends, parents, tutors, teachers, online resources, or a combination of any of the above. (Or even me, if I’ve taken your level math before.) However, even if you’re completely bewildered, don’t just slump back in your seat and whine, “I don’t get itttttttt” because that won’t help anyone help you. First, as mentioned above, always attempt a problem at least twice before asking someone else for assistance. Oftentimes an incorrect answer is due to a silly error that you could catch by doing the problem again. When asking for help, instead of vaguely gesturing at a problem and shrugging, tell whoever’s helping you which parts you were able to follow, which step tripped you up, which formulas you understood, and which ones you didn’t– the more specific, the better.

Never be afraid to ask for help! Each concept in math builds off of previous ones, so if you hold in your questions and remain confused, you’re going to have more and more trouble in the future. As long as you start early, practice consistently, and clarify confusion as soon as it arises instead of the night before a test, you should be well on your way to excelling at math!

Thanks for reading! If you have questions, feedback, or post requests, feel free to drop me an ask. To find the rest of my original posts, click here. :)

—Sophia

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intellectys

Algebra

Masterposts
  1. Advice and tools by @thegrangersapprentice​
  2. Tips and links by @stemnerd3​
  3. Resource masterpost by @etudiance​
  4. Logarithms by @allydsgn
  5. Graph shapes by @codeorg
Resources
  1. Algebra II Homework Help
  2. Khan Academy
  3. ProfRobBob
  4. Math Worksheets Land Printables
  5. MathDrills Worksheets
  6. Algebra Calculator
  7. Mathisfun
  8. Purplemath
  9. Mathway’s Algebra Calculator

Geometry &  Trigonometry

Masterposts
  1. Resource masterpost by @etudiance
  2. Some tips by @sundayscholar
  3. Advice if you suck at geometry by @ballpenned
  4. Cool trig gif post
  5. Pythagorean formula explained
Resources
  1. Hippocampus
  2. Khan Academy (and trig only)
  3. Geometry Dictionary
  4. MathForum Info on Proofs
  5. Geometry4Everyone
  6. Math Fortress
  7. Brightstorm
  8. ProfRobBob (and trig only!)

Precalculus

Masterposts 
  1. Resource masterpost by @etudiance​
  2. Final precalculus review by @studteaing
  3. Precalculus review by @productivityjunction​
  4. Rules for transforming functions
Resources
  1. Precalculus Tips
  2. Handouts and Notes
  3. UC Irvine Videos
  4. Huge cheat sheet
  5. Khan Academy 
  6. Trig identity hexagon
  7. ProfRobBob
  8. Precalc class on EdX
  9. Cheat sheet for dummies

Calculus

Masterposts 
  1. How to study calculus by @sundayscholar
  2. AB calculus resources by @intellectus (#spon oops)
  3. Studying for college math (emphasis on calculus) by @hexaneandheels
  4. AP calculus tips by @kingdomstudies
  5. Guide to calculus BC by @scolasticus
Resources
  1. How to Succeed in Calculus
  2. Krista King (the b e s t)
  3. Calc AB Study Guide
  4. CliffsNotes Calculus
  5. Paul’s Calculus Notes
  6. WOWMath Worked Free Response
  7. Mr. Calculus
  8. Cool Calc Cheat Sheet
  9. University of Houston Calc Guide
  10. ProfRobBob

Statistics

Masterposts 
  1. How to Study Statistics by @study-well
  2. Scanned stats notes by @mildstudies
  3. AP by Michelle
  4. Killer stats notes and pdfs by @communitystudy
Resources
  1. 1st Semester Study Guide
  2. Formula Sheet
  3. AP Stats Tutorial
  4. CourseNotes
  5. Another formula sheet
  6. ProfRobBob
  7. Online statistics calculator
  8. CourseNotes

General

  1. Great tips by @hexaneandheels 
  2. Process of studying math by @doitforthea
  3. More study tips by @study-hack​
  4. Amazing math masterpost by @studybuzz
  5. Tips for studying math by @studyign
  6. This incredible resource blog: @themathblrs

Best of luck with your mathematics!! Hopefully seeing this post is a good sine for the future. 

(You can see my other original content here or request a post here!)

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intellectys

I’m taking the AB Calc AP this year (yikes), so here are some of the resources I’ve found so far! I’ll add more as I find them.

Free Practice Tests & Questions

  1. 1969-1988 Multiple Choice Questions
  2. 2006 Practice Exams (AB & BC, with answers)
  3. Varsity Tutors
  4. College Board Released FRQs 
  5. Peterson’s Practice Test
  6. GetAFive Practice Questions
  7. 4Tests Practice

Booooooks

  1. The Princeton Review (3 practice exams)
  2. REA Crash Course (online practice exams)
  3. Barrons (AB & BC, 5 practice exams each)
  4. Kaplan (6 practice exams & 2 diagnostics)
  5. 5 Steps to a 5 (3 practice exams)
  6. COW Math (online calculus books)
  7. Peterson’s (online, AB & BC)
  8. Multiple Choice Workbook

Videos

  1. HippoCampus
  2. Khan Academy (so many worked answers)
  3. WOWmath (free response questions)

Other Resources

  1. PDF Reference Sheets (from EE, but here in a handy folder)
  2. Interactive Mathematics Lessons
  3. Visual Calculus (tutorials & drills)
  4. College Board FRQ Index
  5. MIT OpenCourseware Exam Prep
  6. Brightstorm
  7. Mr. Calculus
  8. GetAFive
  9. Paul’s Online Math Notes

Study Guides

  1. Elaine Cheong’s Study Guide
  2. University of Houston Study Guide
  3. Final Review Sheet
  4. Calculus Cheat Sheet

I hope this helps you out! There are more useful posts from my study series here.

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