Airbag Lab

Today's lab was inflating a Ziploc bag with carbon dioxide from the chemical reaction of vinegar and baking soda. It was a bit stressful as I had to rely on my own accuracy of my procedure and measurments. However, in the end, my very-small bag was inflated perfectly.

http://liveinspirednow.com/a-little-more-yay-in-your-life/

Quiz Reflection

On Thursday, we took a quiz on gas laws. The quiz was not that bad at all, and I think I scored pretty well. The lectures we've learned so far were not too hard and only consisted of formulas. I am looking forward to our next lessons.

http://www.gettyimages.com/detail/photo/whew-what-a-relief-royalty-free-image/471428407

PV=nRT

Today, we had another lecture for the gas laws unit. This was yet another formula lecture, one that was not difficult at all and mostly involved basic plug-n-chug. I am really nervous for the lab on Monday as it is pass-fail, and I don't 100% trust myself with being accurate in my calculations. Hopefully, it goes well.

http://www.calctool.org/CALC/chem/c_thermo/ideal_gas

Some review links:

https://www.khanacademy.org/science/chemistry/gases-and-kinetic-molecular-theory/ideal-gas-laws/v/ideal-gas-equation-pv-nrt
http://www.learnchem.net/practice/gases.shtml
http://www.mikeblaber.org/oldwine/chm1045/notes/Gases/IdealGas/Gases04.htm

First Lectures

The gas laws unit has proven to be pretty straightforward and simple. The first lectures we've had are centered on one major formula: the combined gas law formula. We've gone through various different problems concerning the gas law, only with different constants. Additionally, we've learned different units of pressure, which I believe is the only difficult part of this unit: memorizing all the different conversions and units. 

https://prezi.com/8ywewmiga8tq/combined-gas-law/

Some links I've been using to study with for the quiz tomorrow:

https://www.youtube.com/watch?v=ir64EcRkf5Q

http://www.chemteam.info/GasLaw/Gas-Combined.html

http://hyperphysics.phy-astr.gsu.edu/hbase/kinetic/idegas.html

Energy Test Reflection

On Friday, we took our unit test for Energy. This whole unit flew by as there were only two lectures and one lab, and everything was pretty straightforward. Thus, I felt like the test was pretty simple and nothing to stress over this weekend. 

https://commons.wikimedia.org/wiki/File:Phase_changes.svg

http://sonoranweeklyreview.com/with-linn-energy-llc-nasdaqline-sandridge-energy-sdoc-and-midstates-petroleum-mpoy-depleting-their-revolving-credit-lines-banks-scramble/

Some links I used for studying:

http://www.aboutthemcat.org/chemistry/thermochemistry.php
https://www.chem.wisc.edu/deptfiles/genchem/netorial/rottosen/tutorial/modules/intermolecular_forces/02imf/imf2.htm
https://www.sophia.org/tutorials/thermochemistry-calculating-energy-of-phase-change
https://www.khanacademy.org/test-prep/mcat/chemical-processes/covalent-bonds/a/intramolecular-and-intermolecular-forces

Specific Heat of a Metal Lab

Yesterday, we did a lab to measure the specific heats of copper and lead by heating the metals in a hot water bath and figuring out the variables for MCAT. I'm pretty satisfied because our copper trial yielded only a 4% error for the specific heat! 

Some review links for the first lesson:

https://www.phy.duke.edu/~rgb/Class/phy51/phy51/node59.html

https://www.youtube.com/watch?v=a1AjBqElz7A

Boat Racing!

Last week, we conducted our boat races. I'm proud to say that my partner and I won third place. It was a really fun experience, and it definitely was a relief from the usual lecture/test stress.

A real boat that runs on biodiesel: https://www.youtube.com/watch?v=4EggCi3qM2A

Biodiesel Making Pt. 2

On Friday, we found our biodiesel separated into three layers! The top and bottom layers were impurities, and our actual biodiesel was the middle layer. To test if our biodiesel worked, we filled an empty tea light wick with the biodiesel and lit it. Sure enough, the flame was sustained for quite a bit, indicating that our biodiesel worked great!

Biodiesel Making Pt.1

On Thursday, we began the process of making our own biodiesel! First, we took recycled peanut oil and combined it with a mixture of KOH and methanol. Then, we put a flask of this mixture into a hot water bath and boiled it for about 20 minutes. Lastly, we let it cool and settle, upon which it began to seperate into two layers.

Hot water bath

Viscosity test

Separated mixture

Make your own biodiesel at home!: http://www.make-biodiesel.org/

How it's made: https://www.youtube.com/watch?v=xLa83KIaEyw

Biodiesel Video

This past week, we've been working on a video project to submit to the National Lung Association biodiesel contest. Our video explained the benefits and debunked myths about biodiesel. We made a stop-motion video which took quite a while as we had to take multiple pictures to create a full-length animated video. However, it was definitely worth it as our final product was really cool! I'm really looking forward to checking out other students' videos. 

http://www.alternative-energy-news.info/technology/biofuels/biodiesel-fuel/

Here's a link!

https://www.youtube.com/watch?v=g5Ycr7ug7NI

Resources we used:

http://www.afdc.energy.gov/fuels/biodiesel.html
http://www.biodiesel.com/biodiesel/benefits/

Unit Test Reflection

We took the unit test yesterday, and I thought it went pretty well! Much of the test came from the practice quizzes on Schoology which I used to review. I am also very happy with my score, and I accomplished it by using those resources on Schoology.

http://community.spartangames.co.uk/index.php?/gallery/image/7174-79bc5e8d-homer-woohoo/

At first, I was a bit apprehensive about this unit as there were so many things to remember. and I felt really nervous about this test. However, with a LOT of practice, I felt really comfortable with the concepts.

Modeling Activity

Last week, we went to the library for a lab. It was interesting as it was in the library where we drew on the tables and played around with building pieces to create Lewis structures (felt just like kindergarden again). I enjoyed this lab as it allowed me to practice Lewis strucutres, something I am still quite uneasy about. It was also great to have Mrs. Frankenberg hovering around, available to answer any questions (which I had a lot of). I will definitely be finishing the rest of the lab on my own for additional practice.

Some more practice: http://web.gccaz.edu/~ksmith8/chm151_files/Lewispractice.pdf

http://www.sciencegeek.net/Chemistry/taters/Unit3LewisStructures.htm

https://www.khanacademy.org/science/chemistry/chemical-bonds/copy-of-dot-structures/v/drawing-dot-structures

Lecture Reflections

We've started the chemical bonding unit, and it's been a bit of a rollercoaster. At first, the concepts were fairly easy to understand, but as the lectures progress, the confusion keeps piling on. I do not believe this unit will be too difficult; it's just the fact that there are SO many things to remember to do problems correctly. I think with a lot of practice and reviewing this unit will not be too bad.

http://www.slideshare.net/Drahmadfahmi/04-chemical-bonds

http://www.roymech.co.uk/Related/Chemistry/Lewis_dot_structure.html

Some practice: 

http://www.pps.k12.or.us/schools/lincoln/files/lscheffl/IBChem1PractTestBonding.pdf

http://regentsprep.org/regents/core/questions/question.cfm?Course=chem&TopicCode=03&QNum=1&Wrong=0

https://www.youtube.com/watch?v=XovrQN6cBaY

Unit Test

Friday's test went pretty well, I do say. It might've been a smidgen more difficult than the quiz as I was a bit uneasy on a couple questions. Some questions asked about acidity and alkalinity, which I didn't really know how to answer, so I guessed on those. Other than that, the majority of the test was a no-brainer. I feel great on how I did.

Cheers to this unit and to Leo's Oscar!!

http://nolanandrew.blogspot.com/2013/05/an-english-teacher-reviews-great-gatsby.html?m=1

Overall, this unit has probably been one of my favorites as the concepts have not been difficult and they are quite interesting to study. I actually enjoyed doing electron configuration problems.

Periodic Trends Lecture

The final installment of the electronic structure unit is periodic trends. The periodic table follows a couple of trends that can provide details about various atoms (only S and P block atoms though). The different trends were a bit hard to differentiate and remember what each one specifies, but I think with some more studying, they will be easily remembered. I'm feeling pretty good about the test on Friday, but I still definitely need to look over this lecture, which I believe may be the hardest lesson of the unit (but still not that difficult).

https://en.wikipedia.org/wiki/Periodic_trends

https://www.youtube.com/watch?v=XK-WTYncldA

Weekly Quiz

Yesterday was this unit's weekly quiz. I've felt pretty good about this unit, and that feeling also applied during the quiz. It went by in a breeze, and I had time to double check all of my answers (I basically was able to work out all the questions a second time just to make sure!). It's always a great feeling when a quiz/test doesn't give you a tough time. Also, much of the quiz came directly from the online practice which I always use to study, so that really helped! All in all, I'm feeling great about how I did on the quiz.

Here are some links for future studying: 

http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch6/relativeenergypractice.html

http://www.rsc.org/learn-chemistry/wiki/Quiz:GeneralI001:_Electron_configuration
https://www.youtube.com/watch?v=I58ByiqnXcY

Spectroscopic Analysis Lab

On Tuesday, we performed yet another lab. Sadly, this lab was not nearly as exciting as the flame test lab. For this lab, we adjusted various knobs on a spectrophotometer and found the amount of light in blue and pink solutions. It was really difficult to adjust the knob so that the number read exactly what it was supposed to. This was extremely time-consuming as we had to re-adjust the knobs for every single different wavelength. Additionally, it was dull as all the lab consisted of was a) adjust the knobs and b) record the number. Not very exciting.

Hopefully, we will be doing another lab this unit that is more hands-on!

First Lectures on Electronic Structure

We've started a new unit, and it has been going pretty well. At first, the unit seemed a bit confusing, but it all began to make sense gradually. The first lesson of the unit was on wavelengths of light. We learned the formula for the speed of light (C= frequency x wavelength) and for energy (E= Planck's constant x frequency). These two formulas were easy to understand as problems associated with the lesson are pretty basic plug-and-chug. Yesterday, we learned about the electron configuration of elements. This lesson was chockful of vocab and steps to memorize. It was definitely a bit confusing and time-consuming at first to figure out each element's different electron structure and diagram and to memorize all the little rules for different types of elements. However, I soon began to understand it, and I even think it's a bit fun (Something I have NEVER said about chemistry, so that's saying a lot!). 

http://chemwiki.ucdavis.edu/Core/Inorganic_Chemistry/Electronic_Structure_of_Atoms_and_Molecules/Electronic_Configurations

Some links for review on these lessons:

http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch6/electronconfigpractice.html
http://www.sciencegeek.net/Chemistry/taters/Unit2ElectronNotations.htm
https://www.youtube.com/watch?v=2AFPfg0Como

On the other hand, our acid-base test scores have arrived, and I am incredibly happy about my score. I did a lot better than I expected, and being that that unit was supposedly the hardest unit of the year, I feel really great. Thank the chemistry gods.

Flame Test Lab

Today in class we had another lab, one which may be my favorite lab we've done all year: the Flame Test Lab. Basically, we placed several different chemical compounds and solutions in the flame of a Bunsen burner to see the various colors each one produced. It was really awesome to see the vivid colors that varied among each metal. The smell was really reminiscent of summer (fireworks, bonfire, you get the picture) when we first walked in due to the Bunsen burners. I enjoyed observing the color changes, and I look forward to hopefully doing more labs like this one!

Unit Test

I have heard countless stories of how the acid base unit test is THE most difficult test of the year, and I arrived to school last Thursday fearing for my life. However... honestly, it wasn't that bad. I'd even go to say that the last unit test on aqueous solutions was a bit more difficult than this one. A good chunk of this unit test was basic vocab, essentially textbook comprehension questions. The other portion consisted of math, which were really not terrible at all. There were maybe one or two which I simply could not figure out how to do, but other than that, the rest of the test went by in a breeze. I'm really thankful that I survived that unit test, and I hope my grade will reflect my thoughts on it.

http://www.illini-nation.com/this-illini-season-really-isnt-that-bad/

Some links I used to study and will be using for the final:
http://www.chemtutor.com/acid.htm#math
https://www.khanacademy.org/science/chemistry/acid-base-equilibrium/titrations/v/titration-calculation-example

Unknown Acid Lab

This week, we've been working on another titration lab that is pretty much identical to last week's Acetic Acid lab. The only thing that's changed is that we're not using acetic acid, rather an unknown acid. We still titrated the unknown acid with NaOH, just like the acetic acid lab. Another thing that's been added to this lab is that we have to heat the solution as the unknown acid does not dissolve as easily as acetic acid. It's pretty neat seeing the solution turn into a mini tornado when the magnetic thingamajig is added to the flask and spins due to the magnet in the heater.

One frustrating thing about this lab is that we can't seem to get a good percent error like last lab where we got less than 1% error! The first trial of this lab gave us a 16% error, which is definitely not preferred, and the second trial gave us a 7% error, which is still not the best. Hopefully, tomorrow my lab partner and I can get at least less than 5% error.

Solution being stirred

Titration Lab

This week, we've been working on a new lab. The purpose of the lab is to standardize a solution of NaOH with KHP, and then, use that solution's molarity to determine the percentage of acetic acid is in vinegar. To start, we filled the buret with NaOH, and measured out some KHP on a weigh boat. We transfered the KHP to a flask, and filled it with water to make a solution of 75 mL. Next, we added three drops of phenolphthalein to act as a color indicator for the endpoint. Lastly, we slowly drained the NaOH solution into the flask until the solution reached a permanent pink color. This was the hard part as we never knew exactly when to stop, but then again, we couldn't go too slowly as we needed to finish within a class period. Although, I thought I sometimes went too overboard with the NaOH, we ended up getting a 0.85% error! All in all, I enjoyed this lab and watching the clear liquid turn into a bright pink in a matter of drops.

The buret filled with NaOH

KPH

KHP solution ready to be titrated

The solution turns pink where the base hits it, but then soon disappears

The endpoint has been reached!

Acids & Bases Weekly Quiz

Today's quiz proved to be quite a relief. All throughout the day, I had been stressing over this quiz as I had not done so well on the last unit test. Thankfully, when it came down to actually taking it, it was pretty much half as hard as I thought it would be. I had no trouble answering any of the questions, and I had time to double (and for some, triple) check my answers. These are the kinds of quizzes I thank the chemistry gods for blessing upon me. I have a good feeling about this one.

https://memecrunch.com/meme/DEZ5/phew

Hopefully, the rest of the unit won't get much harder than what we've learned so far, but I'm probably jinxing myself. 

Here are some of the links I used to study with which may come in handy for the unit test:

https://www.youtube.com/watch?v=Xeuyc55LqiY

https://www.youtube.com/watch?v=l5fk7HPmo5g

http://www.chemteam.info/AcidBase/AcidBase-Problems&Video.html

First Lessons on Acid-Base

We started our new unit on acids & bases on Wednesday. So far, the majority of the lessons are not very complex nor difficult to understand. I may just need to study some of the vocab again. Wednesday's lecture consisted of identifying the differences between acids and bases, strong vs. weak, and Arrhenius vs Bronsted-Lowry acids. This was probably the most difficult out of the two lectures we've had so far as it was very vocab-packed, and there are some rules that need to be memorized in order to identify what type of acid or base a substance is. Today's lecture was more math based in that we had. It was basic math and involved a simple formula to find the M of either H or OH ions in a reaction. Overall, these two lessons have not been difficult, and I am hoping that the rest of the unit will not be super bad (but it probably will).

A good summary of what we learned:
http://www.chem.wisc.edu/deptfiles/genchem/sstutorial/Text12/Tx121/tx121.html

Vitamin C Lab

On Monday and Tuesday, we performed the Vitamin C lab. My pre lab question was a math one, and it really wasn't hard at all. You just needed to know the formula of calculating concentration by dividing the drops of iodine needed to reach the endpoint of the sample over the drops of iodine needed to reach the endpoint of the standard. The actual lab consisted of measuring the number of drops of iodine were needed to reach the endpoint (when the solution turned permanently blue) of various fruit juices: pear, apple, grapefruit, v8. We then compared these numbers to the number of drops needed to reach the endpoint of a standard Vitamin C solution, made by a dissolved 500mg Vitamin C tablet in 500mL of water. We performed 3 trials while everyone else mostly performed 2 trials. This was to make sure we were being extra accurate, but when we actually looked back at our data for the trials, it seemed as if that extra trial just threw the average off. For example, the standard solution had endpoints of 39, then 27, and finally in the 3rd trial, it had an endpoint of 55. So, it totally threw off the average of the endpoint of the solution. This was probably due to the fact that we did the third trial on the second day of lab, when we had a new standard made. The standard was most likely much different than the standard from day one, throwing our number off.

Making the standard: mini tornado!

Clear solution of  juice

Some iodine has been added and the solution turns blue for a second
before disappearing back to clear

Endpoint has been reached!

Finally, we compared the numbers to figure out which juice had the highest concentration. The more drops of endpoint, the higher the concentration that solution would have. The lineup from most concentrated to least was Vitamin C standard, apple juice, v8 Golden Goodness, and finally, pear nectar.

Overall, this lab was pretty interesting to watch the color of solutions change. It did grow tedious for the solutions (Vitamin C standard) that took a large number of drops for it to turn blue. I enjoyed this lab and look forward to the future labs of this unit.

Quiz Reflection

Today I finally took the weekly quiz from last week. It was not that difficult nor that time consuming as there were not too many calculation problems. The quiz consisted mostly of concept and graph reading questions. This was one of the few quizzes/tests in which I actually had time to spare upon completing it.

http://www.gmlcpa.com/its-a-wrap-tax-season-2014/

Although the calculation portion of the quiz was pretty straightforward and not complicated, I suspect that the calculation problems on the test tomorrow will be a bit more detailed and complex. This means more practice for me :)

Some helpful links for studying:

http://www.nclark.net/MolarityPractice.pdf

https://www.youtube.com/watch?v=SXf9rDnVFao

https://chemistry11mrstandring.wikispaces.com/Stoichiometry+Calculations+Involving+Molar+Concentration

https://www.youtube.com/watch?v=KVZ_KS45rVg

http://chemcollective.org/activities/tutorials/stoich/solution_stoi

http://www.brainstretch.net/introChem/molesToMolarity/molarity/molarity.htm

Murder Lab Investigation, Day Two

Day Two consisted of weighing the dry filter paper that contained the solid from the reaction. The solid was a pea green powder.

After weighing the filter paper, we subtracted this mass from the mass of just the filter paper to figure out the mass of the solid. Then, we calculated the molarity of this substance and found out that it was roughly 0.07 M. To figure out the identity of the unknown substance, we knew that it must have been silver nitrate because when silver nitrate combines with sodium carbonate, it should make a solid, which is exactly what happened in lab. The 0.07 molarity matched Mr. Green's description, as he was found with traces of silver nitrate with a molarity between 0.05 and 0.15 M.

Murder Lab Investigation, Day One

The murder investigation lab seemed to be a very interesting lab. I love the idea of solving a a mystery while incorporating chemistry into it. It gives a taste of what forensic investigators do in reality. Today's task was combining an unknown solution with sodium carbonate in a beaker. Both reactants were clear, but when combined, the product was a milky white substance.

Then, we poured this substance into a funnel with filter paper inside an empty Erlenmeyer flask to collect any solid. While letting the liquid drip down into the flask, I noticed there was a sand-like substance forming inside the liquid, showing that the reaction definitely produced a solid. Thus, it can be inferred that the unknown substance is silver nitrate, due to the fact that it should produce a solid when reacted with sodium carbonate based on solubility rules.

Molarity

Unfortunately, these past few days in chemistry have been a bit of a whirlwind as I was absent from class Thursday and Friday for a field trip, which by the way I had a great time on! However, it was frustrating to be in utter confusion regarding what we learned in class. Today, I received some notes from my peers and learned molarity on my own and within a small group. It is not that complicated, and many molarity problems can be solved using commen sense, rather than using stoich. I still need to learn about dilutions and look over the aqueous solutions packet from last week.