3 Questions 11-29-13

1. Recently I have learned that I have made All-state.  It was a lot of hard work but it paid off in the end.  If you set your mind to something.  You can achieve it.

2.  Recently I have learned about integrals in calculus.  I can now find the area under a line.  Hooray!

3. Next I plan on drafting some of my essay for my essay in Mrs. Hansen’s class.  The sooner I do it, the better.

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By aandre15

Who cares about Titration?

Simply put, titration is a method used to the determine the concentration, (molarity) of a solution.

A typical titration would start with a known quantity of an acid or base solution in a beaker, but the concentration of the solution would be unknown.  Next, a buret would be filled with an acid or base solution of a known concentration.  If the beaker’s solution was basic, the buret’s would be acidic, and vice versa.  Finally, an indicator is added to beaker solution.  The indicator will change color when the equivalence point is reached.  Then the titration begins.

Solution is released from the buret until the beaker solution changes color, typically a dull pink.  Then the amount of solution used in the buret is recorded.  Using the equation VANA = VBNB , where V is volume, N is molarity, and A and B are acids and bases respectively.  The molarity of the beaker solution can be calculated.

This is possible because acids and bases cancel each other out, and there is a point where they cancel out perfectly, the equivalence point.  To figure out the concentration of citric acid in fruit juice, you would perform this process, making sure a basic solution is used in the buret.

Sources:

http://chemistry.about.com/od/acidsbases/a/aa082304a.htm

http://chemwiki.ucdavis.edu/Analytical_Chemistry/Quantitative_Analysis/Titration

http://answers.yahoo.com/question/index?qid=20101101071906AANX3M1

http://chriscatanach.wordpress.com/

Featured Image:http://en.wikipedia.org/wiki/Titration

http://chemistry.about.com/od/chemistryglossary/g/Equivalence-Point-Definition.htm

http://www.dartmouth.edu/~chemlab/techniques/buret.html

“Cool” Chemical Reactions

I find it ironic that an article titled “chemical reactions” actually had demonstrations that were not technically chemical reactions.  I suppose “Cool things that have to do with chemistry” doesn’t have the same ring to it.

(I’ll be going in reverse order, click here to see the original article)

  1. This one was a chemical reaction, the constant changing of color was due to the varying levels of the compounds in the solution.  The equation summarizing this would be IO3 + 2H2O2 + CH2(COOH)2 + H+ → ICH(COOH)2 + 2O2 + 3H2O.  This is a complex redox reaction.
  2. The ignition of the thermite is a reaction. Fe2O3 + 2Al → 2Fe + Al2O3 + heat and light.  It is a single replacement reaction, and the Iron is reduced.  However, the reaction with the liquid nitrogen was just a display to if the temperatures canceled out, rather than a chemical reaction.
  3. This is not a reaction, a change in the state of matter is not a chemical reaction.  If the helium was heated, it would still be helium
  4. Once again, not a reaction, because the Sulfur hexaflouride’s chemical makeup remains the same, despite its zany effects on human vocal chords.
  5. Just because a compound is absorbent, doesn’t mean there is a chemical change.  It is a little like an aqueous solution.  The water remained water throughout the video.
  6. This one was tricky, because the sodium acetate dissociated into the water solution.  Therefore, no chemical reaction took place.
  7. Not a reaction, the demonstration only took advantage of diamagnetism, a physical property.
  8. This was a decomposition reaction.  Oxygen gas was released and oxidized.  2KClO3(heat) → 2KCl + 3O2
  9. This was obviously a reaction.  The magnesium reacted with the oxygen in the carbon dioxide.  In the combustion reaction, the magnesium was oxidized.  2Mg + CO→ 2MgO + C
  10. This demonstration consisted two reactions.  The first was with the sodium and water.  It was a redox reaction, and the sodium was oxidized.  2Na +  2H2O → 2NaOH  +  H2   The heat from the first reaction triggered the second reaction with the sodium and chloride.  The second one was a combination reaction.  2Na  +  Cl2 → 2NaCl

Personally, my favorite reaction was with the Potassium chlorate and the gummy bear (#8).  I felt a combination of dread and amusement as I watched the gummy bear’s demise in the merciless inferno of chemical doom.

Sources:

Want more cool chemical reactions? Check our this link!

3 Questions 11-22-13

1. Today I went on a field trip for band.  The purpose of the trip was to encourage involvement in the music programs at Mayfield.  Overall it was very fun and I’m glad I went.

2. Recently I have learned that in order to become good at something, you have to make a conscious effort to practice and become better.

3. Next I plan on attending the football game.  GO TROJANS!

By aandre15

3 Questions 11-15-13

1.  Recently I finished one of my math assignments.  The last problems were challenging, but now I understand how to maximize the profit in a business model.

2. I have just learned about redox reactions in science class.  Honestly, they weren’t as complicated as I was expecting.

3. After this, I plan on redoing some flipped questions and updating my lab notebook.

By aandre15

3 Questions 11-8-13

1.  Recently, I have finished the flipped 4.1 and 4.2 questions.  I wrote down the notes, and honestly can say that I was better able to participate in class because of them.

2. I have learned about net ionic equations.  I think their cool because they are a neat way to show exactly how compounds dissolve.

3.  Later, I plan on finishing the homework assigned today in science class.  I need the practice.

By aandre15

Baby Bottle Lab

In today’s blog I’ll discuss the baby bottle lab we did for the majority of last week.

In short, the lab was a success for me. I managed to get my baby bottle all the way to the other side of a PVC pipe with water. (a distance of 600 cm).  Honesty, getting the bottle to the other side had less to do with the combination of baking soda and vinegar and more to do with the design of the lid and bottle.  In my first run, I used about 240ml of vinegar and about 18ml of baking.  The bottle went about 450cm.  I used a different bottle, but with the same amounts of reagents, and the bottle went all the way.  When observing my classmates’ bottles, I noticed that often times two students would use the same ratios of reagents, but achieve different results.

If I could have adjusted the experiment, I would have tried to get everyone to have exactly the same baby bottle.  This would also us to directly compare our results.  Some trial and error was required, but I solved my problem by adding more vinegar and baking soda.

At the end of a run, either baking soda or vinegar is left over from the reaction.  The amount of the substance left over is determined by stoichiometric amounts because of the reactions on the atomic scale.  One molecule of baking soda will always react with one molecule of vinegar, regardless of the mass of either compound.  Depending on the amount of vinegar or baking soda, either chemical can be the limiting reagent.

Click here to see a video of the Baby Bottle Lab.

Sources: Baby Bottle Lab Sheet; http://virtualgardner2.weebly.com/h-chemistry-unit-3.html; http://chemcollective.org/stoichiometry

Featured Image: http://virtualgardnerblogs.weebly.com/chemistry.html

3 Questions 11-1-13

1. What tasks have you completed recently? 
2. What have you learned recently?
3. What are you planning on doing next?

1. Recently I have finished one of the stoichiometry worksheets.  After much practice, I have found the topic easier to understand.  The most difficult part was identifying which chemical was the limiting reactant.  Now, I feel I am ready for that portion of the test.

2. Recently, I have learned how to maximize the area of a land plot in calculus.  What made the math intriguing was it’s direct to life application.  Unlike algebra 2 and trigonometry, calculus is generally more applicable to real life.  I think that calculating the rate of change of a function is an extraordinary idea. 

3. Next I plan on catching up on school.  I plan on reading my book for English, I well as reviewing some math and science homework.  With the end of marching season, I plan on using the extra time to refocus on my studies.

By aandre15