Blog

CHEM 235 Exam Prep – Organic Chemistry Lab Techniques

Here are the Flashcards I made – Glossary of terms https://quizlet.com/148816707/chem-235-glossary-flash-cards/

Laboratory maintenance

  • Do not put chemical back into original containers
  • Measure out hazardous chemicals at the fumehoods and transport them in closed containers
  • Clean your glassware with soap & multiple rinses with water at the end of each lab so it’s clean for the next lab ( video on proper cleaning)

https://groups.chem.ubc.ca/safetytraining/DZEorganiclabCD1/index.html

Intro Video 1- Personal Protective Equipment

  • No sandals or open toed shoes. Wear leather closed toes shoes
  • Cover legs. no shorts
  • wear long sleeved shirt to cover your arms
  • wear knee length lab coat
  • do not wear hat
  • tie up your long hair. you might have to tuck your hair under the collar
  • wear protective safety goggles or normal prescription eyeglasses that are at 4 cm wide and tall. Wear glasses at all times while in the lab

Intro video 2 – Cleaning glassware

  • the successful outcome of experiments can be affected by how clean the glassware are.
  • sponges for cleaning the benchtops
  • begin cleaning by eliminating as much solid waste as you can. choose the appropriate size brush to clean. Add small amount of detergent and hot tap water and then scrub with brush. rinse with tap water thoroughly. If still dirty, use Comet.
  • be very careful when cleaning the inner tube of the condenser. It is not necessary to clean the outer jacket or outlets
  • do not put a brush into the tip of a separatory funnel
  • shake out water after rinsing
  • put the glassware in your locker on its bottom. the opening must be exposed to air
  •  do not use paper towel to dry
  • In some cases, use acetone at the acetone washing station
  • If you need to dry quickly to use again, use acetone. If it will be in contact with water based solution, acetone is not necessary.

Introductory video 3- waste disposal

  • there’s a solid waste container in a large fumehood. don’t put glass there.
  • glassware such as capillary tubes should go to the glass waste container.
  • flush water based solutions down the sink e.g. the hcl, h2so4, naoh, nahco3 (inorganic acids and bases). flush with running water for at least a minute
  • put organic solvents into the red cans labelled liquid organic waste e.g. diethyl ether, methylene chloride. the container is next to the solid waste.
  • acetone has its own special disposal can beside the glass waste.

What to do in case of a fire

  • turn off the heat source
  • place a watchglass over the top of the vessel
  • try to remove solvent bottles and equipment away from fire
  • fires involving small amounts of solvent will burn out harmlessly
  • dry chemical or co2 fire extinguisher for bigger fires

What to do for spills

  • flush, safety shower
  • get rid of clothes with chemical spills
  • sweep off floor, wipe up with wet sponge if inorganic. if organic, use paper towel
  • eye- flush with water for 15- 30 minutes

WHMIS

  • class a = compressed gas
  • class b = flammable and combustible material
  • class c = oxidizing material
  • CLASS D 1 =  poisonous and infectious
  • class d = materials causing other toxic effects
  • class d3 = biohazardous
  • class e= corrosive
  • class f= dangerously reactive material

evaluation

  • do prep work
  • do homework questions due at the start of lab
  • the quality of your product matters
  • there will be quizzes
  • **remember that you must always use ink

 

Extraction

  • water Based solution
  • Immiscible organic solvent e.g. ether
  • Separatory funnel
  • Dissolve compounds in the ether solution
  • Split the aqueous solution into 3. Use a graduated cylinder
  • Funnel never more than 2/3 full
  • Fix and invert and release pressure
  • No whoosh sound is good
  • A bit that is mix, do its own beaker
  • Pour out the top of funnel and cork it up
Recrystallization
  • Cork and ground glass joint
  • Boiling chip
  • Container with water
  •  Put in the flash, add boiling chip
  • Add just enough solvent to cover the compound
  • Wes condenser to the outlets, wet the ends of the tubing first
  • Put the whole apparatus.
  • Two sided clamp LOOSELY around body of wes condenser
  • Put the tubing over the metal thing to keep it out of the way.
  • Attach the lower out to the water source and let the other one spill out into the sink. Be gentle when you turn it on.
  • Boil at high heat
  • Use a paper, folded, thick strip around the top of the flash to stir the flask
  • If not dissolve when boil, dropper some solvent until dissolves
  • Remove flash from hot plate USING A CLAMP around the flash.
  • Remove from the wes condenser and clamp at an angle to the bench. Do not disturb in any way.
  • Evaporate away solvent, add incompatible solvent ( compound does not dissolve in this solvent), ice water bath
Simple distillation
  • 100 ml Rb
  • Still head adaptor
  • thermometer
  • Collection vessel

Filtering Unwanted solids

  • Gravity filtration using filter paper
  • Erlenmeyer flask large enough that solvent occurs no more than 1/2 its volume
  • Glass filter funnel
  • You want to keep the solvent but not the solids
  • Use the small ring clap with a gap
  • Hot filtration – preheat in oven
  • Pour solution down a rod to avoid splash
  • Rinse flash with ice cold solvent to get rid of bits
  • If flow slows, push the filter paper down
  • KEEP the SOLVENT
Filtering wanted solids – suction filtration
  • Suction trap = the big one
  • Use three pronged clamp for the filter flash
  • Temporarily disconnect the vacuum before you add the crystals so you don’t break your crystals
  • Press down on funnel for better seal
  • Use ice cold solvent or use the MOTHER LIQUOR, pour down the stirring rod
  • Do suction for several minutes to dry the crystals
  • Use spatula to flip onto a watch glass and let it dry
  • Cover with weighing paper to protect
  • It’s easier to take crystals off the filter paper when dry
Preparing a sample for melting points
  • Micro cover glasses
  • Capillary tubes
  • Drop tube
  • Fischer Johns or mel temp
  • Grind the solid into fine particle -> crush on watch glass using a test tube
  • Fischer john -> all crystals touching it each, none too close to edge, use copper cooled in ice bath to cool
  • 3 -4 mm in capillary tube, drop tube more than once, firmly packed no more than 2-3 mm
Taking melting points
  • Heating block/sample well
  • If known, raise temp to max until 15-20 below expected melting point. Reduce the rate so rate rises 2 degrees per minute.
  • First drop of liquid amongst the crystals. 2nd temp – whole solid mass turns to liquid. The melting point is both of these numbers
  • If unknown, max until melting is noticed. The observed temp is lower than the true melting point because lag between thermometer reading and actual temperature of heating block. Allow cooling until 20 degrees lower than observed melting point
  • Plastic beaker with ice -> wipe off moisture. Use hot hands device.
  • All used in glass waste container
  • Calibration equation – CORRECT THE TEMP READING USING CALIBRATION EQUATION. Y = true mp. x.= observed mp
  • Use hair dryer to cool. If known, heat until 10 degrees below known mp. Preliminary reading will be lower than true. Let cool until 20 degrees lower than preliminary reading. Heat at 2 deg increase per minute.
Calibrating a thermometer
  • Ice bath in 400 ml beaker glass.
  • Immersion line is covered by water. Stir ice bath gently to ensure even distribution of temperature. If not exactly 0, adjust your readings. For distillations, glycerol at tip, insert into stilled adaptor until immersion line is completely covered.
Thin layer chromatography-
  • Rapid separation and qualitative analysis of small amount of material
  • Cannot be used for volatile compounds
  • Partition of compounds between moving liquid phase and solid stationary phase
  • 100 ml beaker
  • 1/2 moon paper
  • Silica gel plate
  • Pencil and ruler
  • Spotting solvent
  • Dissolve your compound in a volatile solvent, spot onto your plate, the volatile solvent evaporates and the compound gets absorbed onto solid plate.
  • Dip plate into developing solvent, capillary action
  • Compound attracted to moving liquid phase (the developing solvent that moves by capillary action) and moves with it. Different substances attracted to moving phase differently so moves different amounts.
  • ** LEAST POLAR SUBSTANCE MOVES FURTHER since liquid phase is less polar than the solid phase. **
  • Rf = distance traveled by compound/ distance traveled by the solvent from t
What to do if there’s a fire
  • Turn off the heat
  • Put a watch glass on top to smother the flames
  • Remove solvents and equipment from area
  • Most fires will burn out by themselves but if not, use fire extinguisher

 

Email, RSS Follow
Email
Share on Tumblr

I can’t do it – and that’s okay

Are you like me: do you like to try new things? Do you believe that as long as you try you’ll get it eventually? That after asking for help and changing up the way you do things, you’ll get it right?

And that works most of the time. And you’ve proud of your refusal to give up

But then you don’t. You’ve tried a lot. You’ve put hours and hours of time. You’ve asked for help. You’ve contemplated giving up but you didn’t. You packed up everything you did, splurged on a Starbucks tea to bribe yourself, and worked on it.

You’ve worked on it again and again. Now it’s time to give up. Sometimes you have to give in. You can’t do it. It’s okay to admit defeat. I feel sad about it. I don’t like to give up in a fight. But here’s what I’m telling myself:

  • I’m admitting defeat to this small thing so that I can achieve victory in the bigger picture
  • I have to admit to myself that it was out of my scope.
  • But by trying, I’ve already expanded what I can do. I’ve pushed myself and I’ve grown. Next time, I’m going to be able to do more than I did this time.
  • I can learn a lot from giving up. Now that I’ve passed it on someone I highly respect and has decades of experience on me, I’m going to examine it after he’s done with it. I’m going to compare it and learn what was needed to done to improve it.

Even if you admit defeat, you’re still a fighter. Continue on to challenge yourself.

Love,

Shanna

Email, RSS Follow
Email
Share on Tumblr

How to succeed in Organic Chemistry CHEM 233

So, I bought my CHEM 233 textbook on Craigslist and the seller turned out to be Sarah who I went to high school. Sarah is a year ahead of me but has always been very kind and friendly. She’s also highly intelligent and will be attending UT Pharmacy school this fall. I wish her best of luck! Her tips for succeeding in CHEM 233 are:

  • You should get a textbook for this class.
  • Invest in the Carbonless Copy paper. You need it.
  •  Do practice questions. There’s no way you can do all the questions in the book but make sure you do some.
  • Do not freak out if you fail a midterm, especially midterm 2. Fail as in under 50%, not under 90%. Failure happens. Apparently the final is really easy so you’ll be okay.
  • That said, do not freak about failing CHEM 233 the course. Loads and loads of students pass CHEM 233. You’ll also pass as along as you don’t play Pokemon Go all day every day this semester.

 

Email, RSS Follow
Email
Share on Tumblr

Note-taking tips

If taking notes for you doesn’t help you, don’t take notes. There are high-achieving students that do not take notes.

The primary goal of taking notes is to condense the material so that you don’t have to refer back to the lectures or the textbook when you’re studying for the exam. You want your notes to only contain what you need to know and not other fluff so that you can study efficiently.

USE DIAGRAMS AND DRAWINGS

  • Super helpful for visual learners
  • the diagrams only need to make sense to you .
  • Diagrams are really helpful to study physiology. Draw out neurons, xylem and phloem
  • Use colour. ions flowing in can be red, ions flowing out can be green.

TAKE NOTES IN COLOUR

  •  It helps you remember because you’re engaging your visual memory better when you use different colours rather than the same boring old colour. The key is keep your mind from getting bored.
    This year I’m using: 48 Coloured Pens. I seriously bought 48 pens. If you scroll back to my posts during final exams, I wrote about using 6 or so pens within two days. I wrote a LOT.

MAKE CHARTS

  • I haven’t used this tip yet but I was told that charts are great for studying pharmacology.

TAKE NOTES ON THE POWERPOINT if possible

  • If powerpoints are provided by the professor
  • This will save you a lot of time during the lecture!
  • Unfortunately, a lot of my first year classes did not provide powerpoint but my second year level courses did. On the plus side first years, you get to use your favourite Moleskine or other cute notebook. Yay!

CATCH AS MANY EMPHASIZED DETAILS AS MUCH AS YOU CAN

  • Exam questions often test little details so listen carefully for your professor to hint at what little detail is important.

HIGHLIGHT/CIRCLE/DRAW STARS NEXT TO IMPORTANT CONCEPTS

  • That said, for your long-term learning, it’s more important to know what big picture concepts are important. Indicate what these are for yourself because it’s easy to forget when you have pages and pages of notes that you took 3 months ago.

TAKE NOTES BY HAND

  • Writing by hand helps you remember better than typing. There is research to back this up!
  • It’s easier to draw diagrams and sketch molecules and formulas.

USE A NOTEBOOK, NOT LINED PAPER

  • Lined paper will get crumpled and lost. You will cry if you lose that page of notes that your professor said that you absolutely must remember for your midterm.
  • A notebook also keeps everything in order so you don’t have to sort through a pile asking yourself if where is that sheet that comes after the sheet that says “see next sheet”.
  • Notebooks that I’ll be using this semester: Extra Large Moleskines. These are more expensive than the 25 cent notebooks that I used last year but I believe that paying for high quality is important. I also know that having a nicer notebook will motivate me to take neater notes

KEEP YOUR HANDOUTS ORGANIZED IN A FOLDER
I used a two pocket Folder.

  • One side containing the class syllabus, the class schedule, old assignments that got handed back are tucked in the back of this side
  • The other side contains the current class’s assigned readings or assignment, plus new handouts that I got.

COLOUR CODE YOUR NOTEBOOKS AND FOLDERS.

The colour system I used was:

  • Yellow notebook and folder for Physics
  • Red notebook and folder for Chemistry
  • Blue notebook and folder for Biology
  • Purple folder for English. A notebook wasn’t too necessary because I liked to write on the printed out poem.
  • Argyle print notebook and Panda folder for Math. Gotta be totally random for one of the classes.

THE REWRITING TECHNIQUE

  • I did this for Microbiology but not for other classes.
  • Rewrite the most important concepts
  • Rewrite this again and again until you have it memorized
  • Close to the exam, go back to the powerpoints and fill in details
  • Credits to Andrea for introducing me to this method of rewriting notes
Email, RSS Follow
Email
Share on Tumblr

Best MCAT books

The word MCAT strikes dread and fear into the hearts of premeds.

Best content review: 10th Edition Examkrackers MCAT Complete Study Package (EXAMKRACKERS MCAT MANUALS). Past MCAT takers and medical students have said that ExamCrackers is best if you want a concise review of content. It also comes with a 10-week study plan that details which chapters to cover.

Best CARS practice: MCAT Verbal Practice: 108 Passages for the new CARS Section. It’s a thick book. Advice from past MCAT takes is that the only way to get good at CARS is to practice. 

If you’re weak in Biology: Examkrackers 1001 Questions in MCAT Biology. A medical student I talked to did ALL the questions. A current surgical resident said that she did every 3rd question or so.

If you’re weak in OChem: Examkrackers: 1001 Questions in MCAT, Organic Chemistry  OChem. Enough said.

Best on-the-go study resource: Barron’s MCAT Flash Cards

Email, RSS Follow
Email
Share on Tumblr

How to self-study for AP exams

This post is for high school students. I got a 5 on my AP Biology without taking the course, 5 on AP Calculus with taking the course, and a 4 on AP Chemistry with taking the course. These are the resources that I personally found helpful when I studied. I spent a lot of time combing through blogs and forums to decide on which books to buy before studying. Yay you get to benefit from both my research and my personal experience using them.

I’ve linked the newest version of the resources for you but I actually used older editions of these. I love buying books on Amazon because my local bookstores didn’t have them. 

General tips

  • Buy your  books/flashcards as early as possible (September if possible!) so you can start using it as you take the course because….
  • …You should start studying as early as possible!
  • Focus on practice questions and exams more than content review. That’s the difference between a 4 and 5. Practice practice practice.
  • Use pre-made flashcards to study on your way home from softball games, jazz band practices, on your way to a party, whatever.

AP Biology

Recommended books: Cliffnotes, 5 Steps to a 5

Everyone talks about studying with Cliffnotes.  I was going through this carefully when I started studying. I ran out of time close to the exam so I switched to my AP Biology 5 steps to a 5. I took this review book with me everywhere. Very close to the exam, I locked myself into my bedroom and made my review books my best friends. 5 Steps to a 5 is thin enough that I studied while I was sitting in class. To be fair, I only dd this when we were watching a movie in class (which oddly my classes did a lot of) or the school technology wasn’t working yet again and everyone was sitting around staring at the teacher try to fix the computer and not if there was a lecture going on. I think the Cliffnotes covered information more in depth while the 5 Steps to 5 give a quick overview and had good practice questions.

PRO TIP TO GET a 5: If your extracurricular schedule is insansely busy as mine was, invest in a pre-made flashcard set! I studied my flashcards on the way home from softball games, jazz band practices, and more. If you study 10 minutes everyday 6 days a week, you gain a hour of time! The small pain is worth it when you get a hour to go for ice cream with your friends one week, to drop in on a party the second week, to study for your regular school classes. Get the flashcards.

AP Biology Cliffnotes:  http://amzn.to/2bA82gn

AP Biology 5 steps to a 5: http://amzn.to/2bJb0jq

AP Biology Barrons Flashcards: http://amzn.to/2bjuycP

 

AP Calculus

Princeton review is the only way to go. I’ve passed on my Princeton review to my younger brother because it was my saviour. I’m actually awful at math so I relied on review books and practice questions to get me a 5.

Best for Calculus AB: Princeton Review http://amzn.to/2bD59c8

Best for Calculus BC: Princeton Reviewhttp://amzn.to/2bAhY9C

The key to doing well in math courses is do as many practice questions as possible! I just bought this set of practice questions for my younger brother who is writing the AP Calc exam this May. http://amzn.to/2bm4CdF

AP Chemistry

I recommend taking the in-school course which helped me a lot for AP Chemistry. I don’t think I could have learned as well if I only self-studied. My friend Seon Yeong bought the Barrons so we shared resources.  I think the practice questions in the Princeton review are superior to the questions in Barrons but I think the content review explanations are better in Barrons.

Best book to study AP Chemistry: Princeton Review http://amzn.to/2bEaYdB

If you’re shaky on content or are completely self-teaching, Barrons http://amzn.to/2bS750L 

 

Good luck on your AP Exams. Hope you all get 5s!

Email, RSS Follow
Email
Share on Tumblr

Another UBC Leadership & Service Opportunity

Are you looking for ways to get involved and to give back to the community? UBC Circle K International is a service-oriented club dedicated to helping those in need – both within our communities and internationally. If you’re looking to gain leadership skills and volunteer experience or to meet like-minded individuals who are equally as passionate about helping others, then this is the club for you!

We are currently hiring for the following positions:

VP External (1)
Communications Director (1)
Marketing Director (1)
Events Director (2)
Volunteer Director (1)

No previous experience required, except for a good work ethic and a passion for service!

To apply, send your resume and cover letter to ubccki.pres@gmail.com before Friday, August 26. You are welcome to apply for more than one position. Feel free to message us on Facebook or to email us at ubccki.pres@gmail.com with any questions or for additional info on what each position entails!

Email, RSS Follow
Email
Share on Tumblr

UBC Healthcare-related Leadership & Service Opportunity

Are you passionate about giving back to your community as a leader? Passionate about vision and health? Interested in connecting with the community of the blind and visually impaired? If you said yes to any of the above, apply to be an executive of Vision Health Volunteers and join us organize fun awareness events and fundraisers to make a positive impact!

Apply now!

Perks:

  • You get to contribute community service in a leadership role
  • You get to lead and coordinate an event and/or fundraiser
  • You get to broaden your knowledge of vision health
  • You get to volunteer with individuals with visual disabilities

Join us in giving what we can to make a positive impact!

Email visionhealthvolunteers@gmail.com if you have any questions

Connect with Vision Health Volunteers on Facebook

Join on our AMS registry OrgSync

Email, RSS Follow
Email
Share on Tumblr

High school students leadership & community service opportunity

Musicians! Do you enjoy performing for others? Love knowing that you brought a smile to someone’s face? Want to help create opportunities for others to share their love for music? MUSIC OUTREACH SOCIETY is currently hiring School Heads and National Outreach Directors for the year of 2016-2017.

To bring MOS to your school, APPLY HERE:https://musicoutreachsociety.wordpress.com/school-head/

To bring MOS to your province, APPLY HERE:
https://docs.google.com/…/1FAIpQLSdQT4NqcXLbX0et79…/viewform

Deadline: September 3, 2016 @ 11:59pm

Connect with us on Facebook

My experiences with Music Outreach have honestly changed my life and I hope that you’ll give Music Outreach a chance to positively change your life too.

Email, RSS Follow
Email
Share on Tumblr

Spam prevention powered by Akismet