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Final Thoughts

So guys, we have had our ups and downs. I have enjoyed having you in class (besides the paper balls and laser pointers). For your final post, due today, I would like to know what part of this class you liked best or learned the most about chemistry.

I have counted up blogs and will post it today so you know where you stand.

Good luck and I hope to see you next year or the year after in AP Chemistry.

Dr. B

5/17/10

Hey guys I though I would just remind everyone that it is seriously important to do well on your exams this semester as well as the chemistry exam. The second semester of sophomore year and the first semester of junior year are what most colleges tend to look at the most. If you don't have very challenging exams one day (like religion or ethics) it is proabably a good idea to start studying for harder exams like math and chemistry on that night. Good luck to all.

5-15-10

I am guessing that I still need to get some more blog points so I am putting one up.

We have a test over chapters 14 and 15 on Monday.

That plus the exam is all the chemistry we have left.

5-14-10

Hello fellow students. We had quite a fiasco yesterday with paper balls and laser pointers. Let's try to do better today.

Ok, so blog-wise, we have a test on Monday over chapter 14 and chapter 15. And our exam is on thursday. So it looks like we are going to have to hit it hard this weekend, like Ben and those balls.

good luck, we REALLY need it.

5/12/10

Okay guys, we had a quiz today over acids and bases. Is it just me or did Dr. B say yesterday that it was going to be on stoichiometry? But anyways we have a test on Monday that is going to be over both chapters 14 and 15. She wants us to have both calculations and conceptual questions. I suggest that you start studying now for the test because it's an exam day and we have shorter class periods.

5/11/10: Exam Review

Hey guys! Guess how smart Jim is! I'll give you a hint: he forgot to bring home his Chemistry notebook two days in a row. But fear not! I've recreated an outline of the stuff we need to know for the exam with my book. This probably covers more than we talked about in class, so feel free to correct me in the comments.

• The exam will go from chapter 7 to chapter 15. Here are most of the important terms and concepts from each chapter, as found in the end of chapter summaries.
  
• Ch. 7: Formula mass, percentage composition, empirical formula
• Ch. 8: Chemical equations, precipitate, types of reactions, electrolysis, activity series
• Ch. 9: Stoichiometry, limiting reactant, excess reactant, theoretical yield, actual yield, percentage yield
• Ch. 10: Kinetic-molecular theory, ideal gas, real gas, fluid, surface tension, capillary action, crystalline solids, amorphous solids, phase, equilibrium, molar enthalpy of vaporization/fusion, triple point, critical point, critical temperature, critical pressure
• Ch. 11: Pressure, mm Hg, pascal, atm, Dalton's Law of Partial Pressure, Boyle's law, Charles' law, Gay-Lussac's law, combined gas law, Gay-Lussac's law of combining volumes of gases, Avogadro's law, ideal gas law, ideal gas constant, Graham's law of effusion
• Ch. 12: Solubility rules, solvent, solute, solition, suspension, colloid, electrolytes, saturation, miscible/immiscible, Henry's law, effervescence, enthalpy of solution, concentration, molarity, molality
• Ch. 13: Net ionic equation, spectator ions, ionization, strong/weak electrolytes, colligative properties, molal freezing-point constant, freezing-point depression, molal boiling-point constant, boiling-point elevation, osmosis, osmotic pressure
• Ch. 14: Binary acid, oxyacid, Arrhenius acid/base, Bronsted-Lowry acid/base, monoprotic acid, polyprotic acid, Lewis acid/base, conjugate acid/base, neutralization
• Ch. 15: pH, pOH, titration, equivalence point, end point, standard solution, primary standard
  

Also, I would like to remind everybody that you should eat chocolate before all of your exams.
http://www.slashfood.com/2006/05/29/chocolate-stimulates-the-brain/

5/11/10

Hey Guys, there was no blog last night so I decided to make one. The notebooks are due tomorrow and she is counting up our blogs. I hope everyone has enough!

5/7/10

Once again guys, I need blogs so I guess I will keep on posting until we have an assigned blogger. On Friday we retook the quiz and I think most people did much better. Thank you Dr. B. We took about 15 min. before the quiz to review the material on it and it really helped me. After the quiz we just chilled out for the rest of class. Our test should be coming up fairly soon so start studying.

5/6/10

Ok I don't know if there was a scheduled blogger for tonight but I need posts so I am going to go ahead and give one.

I (and many others) failed the quiz today so Dr. B. is letting us retake it tomorrow. You need to know how to calculate molarity and how to use acids (H3O) and bases (OH) in calculations. You also need to know how to apply pH and pOH in calculations. In addition, you need to be able to tell weak acids apart from strong acids and weak bases apart from strong bases. Good Luck!

5.5.10.

Hey guys, just thought I'd go ahead and get a blog up here.

Well, today in class Dr. B showed us how to do all of the needed calculations.

In conclusion, lab is due tomorrow as is the homework from the text book; remember to get it all done.

*NOTE* - on your lab, be sure to show calculations, sig figs, and label your work for clearer understanding; you can never use too much partial credit. Put the pre-lab and post-lab questions INTO your Lab Notebook as well.

Well, have a good night guys.

5/4/10

Wasn't there supposed to be a blog last night? Well, yesterday was the last day for lab. Everyone remember to do your post lab questions!

5/3/10

Tomorrow is LAST DAY for lab. Remember you are supposed to have 3 titrations with KHP and 3 titrations with Vinegar.

4/30/10

On Friday, we continued our lab. Our goal was to complete 3 titrations. Did everyone meet the goal?

THE LAB...

All right, everyone. I'm pretty sure everyone is pretty confused on what we are supposed to do for THE LAB, so I'm going to try and put out there what I think we are supposed to do. Scully, I'm counting on you especially to call me out for being wrong on anything.

Ok, I'll start off with some definitons:

1. titration-adding NaOH to KHP until it turns a "the lightest shade of pink"
2. KHP-potassium hydrogen phthalate; it's the stuff that look like big salt
3. NaOH-sodium hydroxide; it's what goes in the buret, and is located in a keg-thing by the microwaves
4. phenolphthalein-[fee-nawl-thal-een] stuff that is in X-lax (not the lacrosse possition!) it's what makes the titration, your mixture of NaOH and KHP turn pink

Next off, some general starter. I'll leave some stuff some other guys to comment though

1. --get 2, TWO, samples of KHP; keep it as close as you can to 0.50 g, but it's better to go lower
2. --dissolve KHP in a beaker of ionized water and 2, TWO, drops of pheolthinggummy; swirl it around until it is completely dissolved
3. --while one guy is doing step two, the other can use the tiny beaker Dr. B gave us, fill it with NaOH from the keg-thing, and pour it into the buret.
4. initial NaOH volume reading=0.something(measure from zero); record this before you titrate;
5. stick the beaker of dissolved KHP under the buret and open the valve. THIS IS YOU TITRATING
6. When you're titrating, let in 5 or so mL of NaOH, then swirl, let in another 5 and swirl, let in another 5 and swirl, AND THEN start adding it in drops sssslllooooowwlllllyyyyyyyy (you add it slowly because the point where it is "the faintest shade of pink" arrives really fast)
7. after you titrate, make your Final NaOH volume reading
8. Final NaOH volume reading= somewhere in the teens(measure from zero)

Now all you do is repeat the steps, except you don't have to necessarily add more NaOH. You can just go from where the last one was. You just have to take that into account in your volume readings.

Ok, I really hoped that helped some of you. If it didn't, well I went to St. Ann, you can't expect me to be that good.

AND IF YOU THINK I'M WRONG, FREAKIN' TELL ME. INFALLIBLE IS NOT ME. that guy's German, and is probably just waking up right now to celebrate some Jesus in Rome. If he isn't somewhere else in the world, but I digress.

goodnight!

4-28-10

Hey, everyone. I'm going to do a quick blog tonight because i want to go to bed early, and, well, we didn't have that much to do.

We worked on those worksheets while Scully and Dr. B were at their chemistry luncheon.

Everyone, make sure you have your pre-lab finished for tomorrow. We start the lab, and Dr. B said we will be working on it for a couple of days. I think the lab is kind of hard to understand, I mean it keeps throwing around words like titration and penolphthalein (I still have no idea how to pronounce that). Soooo, I read a couple of times, and it sunk in. I just hope that Dr. B runs through it a little tomorrow.

allllllllllllllllllllllllllll right, comment time!

4-27-10

hey wassup everybody here's what we did in class today and feel free to comment on anything I left out.

Indicators & pH meters

1. Transition interval

• the pit range over which an indicator changes color
• Indicators that change color at pH lower than 7 are stronger acids than other types of indicators
• Ionizes more than the others
• Indicators that undergo transition in higher pH range are weaker acids

2. pH meter

• determines the pH of a solution by measuring the voltage between the two electrodes that are placed in the solution
• voltage change as water ion concentration in the solution changes
• measures pH more precisely than indicators

3. Titration

• controlled addition and measurement of the amount of a solution of known concentration required to react completely with a measured amount of a solution of unknown concentration

Remember to finish up your pre-lab if you did

have a good night

4/26/10

Ch. 14 contd.

-Any species that can react as either an acid or base is described as amphoteric. A good exmple of this is water

-Water can act as a base
-Water can also act as an acid

-The covalently bonded OH group in an acid is referred to as a hydroxyl group.
-Molecular compounds containing OH groups can be acidic or amphoteric.
-The behavior of oxygen atoms bonded to the atom connected to the OH group.

-In aqueas solutions, neutralization is the reaction of hydronium ions and OH ions to form water molecules.

-A salt is an ionic compound composed of a cation from a base and an anion from an acid.

-NO, NO2, CO2, SO2, and SO3 gasses from industrial processes can dissolve in atmospheric water to produce acidic solutions.

-Very acidic rain is known as acid rain. Acid rain is not as rare as people might think. It is actually fairly common but it is normally not found in large concentrations

END OF CH 14. (Followed by DR. B's famous smile that we have grown to hate when ch's end...)

Ch. 15

-In the self-ionization of water, two water molecules produce a hydronium ion and a hydroxide ion by transfer of a proton.

-Solutions in which H3O=OH, its a neutral solution
-Solutions in which H3O>OH, its acidic
-Solutions in which H3O
-Strong acids and bases are considered completely ionized or dissociated in weak aquous solutions.

-The pH of a solution is defined as the negative of the common logorithm of the Hydrogen ion concentration.



There is a link on the HW website with the pre-lab Q's that are due tomorrow and Dr. B has asked us to bring in our Lab Books to class tomorrow. Have a good night.


-

Was there no Blog for this weekend? If there wasn't, well Friday all we did was watch a movie.
That is all.

Notes for Thursday, April 22, 2010

So, everybody has your tests in hand. Keep in mind that they will be graded out of 33, not 35, and there may be a chance for extra credit.

• An acid reacting with a base will produce a salt (not NaCl, although that is a type of salt) and water.
• The stronger an acid, the weaker its conjugate base.
• The stronger a base, the weaker its conjugate acid.
• Proton transfer reactions favor the production of the weaker acid and the weaker base.
• There are some conjugate acid-base pairs that we will need to know. There's a table, but since I don't have my book on hand, feel free to comment with the page in the book where it can be found.

Well, that was pleasantly brief. Good night everybody!