Today we started a new lab on what can impact reaction rate. To this lab there are four sections. Today we did two sections and one half of the class did section 1 and the other half did section 2. I did section one in which was about how the heat of a solvent (water) impacts how fast a solute (Alka-seltzer) dissolves. Our results showed that if the solvent is heated to 6O degrees Celsius than the solute dissolves much faster. In fact it dissolves more than thrice as fast that if it is cooled to 4 degrees Celsius. The other group used one molar hydrochloric acid and combined it with zinc. The point of this was to answer the question "Does the reaction rate change if the substance reacting with a liquid and is a clump or a powder?". When they put the powder zinc the reaction was much more vigorous than with the solid sliver of zinc. This is the case because there is more surface area with the powder and thus more metal for the HCl to react with.
Tuesday or December 16, 2014 A.D.:
Today we finished the lab in the same setup as yesterday with one half of the class doing section 3 while the other half did section 4. I did section 4 in which we experimented if a catalyst does anything to the reaction rate. We tested this by putting 5 chemicals into H2O2. One of them would change the reaction rate of the breaking down of the H2O2. We found that none of the compounds did anything except for Fe(NO3)3 meaning that was the was the catalyst. Now what did the catalyst do? The catalyst sped up the decomposition of the Hydrogen Peroxide from a process so slow that it is not seen to a bubbling that was clearly seen. By the way, the H2O2 breaks down into O2 and H2O. The other group did section three which asked the question " Will the reaction rate change if the concentration is changed? ". They answered this question using HCl that will dissolve Zinc. The variable was the different concentrations of HCl of 1 molar, 3 molar, and 6 molar. The answer to the question above was that the concentration does make a difference and that the higher the concentration the higher the reaction rate. The results proved this because the most concentrated solution (6 molar) dissolved the Zinc much quicker than the least concentrated solution (1 molar).
Wednesday or December 17, 2014 A.D.:
Review day!!! We went over Unit 7 which was great because it was one extra time to study through the unit. I liked it very much for without it I would have gone over the unit one less time. Also, going over it cooled my nerves and told me that I know more about the unit than I thought. I cannot wait until the test because I think I am capable of doing good on it.
Thursday or December 18, 2014 A.D.:
We had our test. I think I did good on it because it seemed fairly easy. I am confident that I will get an A, but I might have just jinxed myself. On the test there was a bonus question in which we had to find out about facts on Santa using other facts. In one question we had to convert the miles Santa has to travel in total over 31 hours into miles total per second. Did you know that Santa has 1000th of a second per house to load off his presents? You don't think this is possible? Actually, according to the theory of relativity, Santa gets more time than this because he is travelling so quickly in his sleigh. Don't believe in the theory of relativity? As a matter of fact, it has been proven so Santa could definitely exist!!! Admit it!
Friday or December 19, 2014 A.D.:
No Science!!! :(
Winter break though! :)
Summary: This week was a week of a test. This means you should study a lot to both to be able to do good on the test and to cool your nerves. For the test I got really lucky because I studied just under an hour and did pretty good on it. Next time I might not get that lucky and I should probably study more before the next test and not rely on luck that I will know the part of the unit that will be on the test. Also although I did study fairly efficiently it could be better. I also need to make sure that I don't study like this definition of study :
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