Essay on Synthesis and Decomposition of Zinc Iodide

Synthesis and Decomposition of Zinc Iodide Partners: Sonya Pasia and Kristen Kobayashi CH 085-01 20 September 2011 Zinc Iodide (ZnI2) was an interesting binary compound to experiment with. In this experiment, weakly acidified water (25mL distilled water with 18 drops 5M acetic acid solution) was used as an aid to bring molecules of the zinc and iodide atoms together, by dissolving iodine molecules, so that bonding would transpire to produce a reaction. Deprived of water, the Zn and I2 molecules would not be capable of moving close enough to each other, and a reaction would not occur. Deprived of acid, the reaction of Zn + I2 would have resulted in 2HI(aq) rather than ZnI2 (s), and it wouldn’t have appeared to follow the Law of†¦show more content†¦Half of the solution was poured into an evaporating dish. Two copper wires were attached to a 9-volt battery on the electrodes. Wires were carefully bent and placed on opposite sides of the solution in the dish, where observations could be made regarding what has seen. Different physical properties were noted during addition of substances throughout the course of this experiment. From the beginning, it was noted that 2.01 grams of Zn metal was silver and had shiny flakes throughout. The 1.985 grams of I2 was dark gray in color and also appeared to be shiny. Once 5mL of acidified water was added, the solution began to change colors, becoming a dark red orange, which was discovered to be closer to Zn(I3) 2. This reaction was endothermic in nature due to heat that was felt in the duration of the reaction. The heat melted some of the I2 to create the I3 in this solution once the color disappeared. After this point it was found that only 0.541 grams of Zinc was consumed in the reaction, making Zn the excess reagent and I2 the limiting reagent. After the ZnI2 was dried, a light yellow powder was noted, and recorded to be the color of ZnI2 (s). When performing the decomposition, a dark By adding the 0.541 g Zn to the 1.985 g of I2 from the beginning of the experiment, it was predicted that there should be 2.526 g of ZnI2 inShow MoreRelatedBook to Study English for Chemistry12934 Words   |  52 Pagesand Latin with English pronunciation. Latin words: singular ending alga Exception: radius corpus curriculum plural ending algae radii corpora curricula plural ending syntheses ____________ phenomena ____________ Greek words: singular ending synthesis hypothesis phenomenon criterion Some of these words have double plural form: formula formulae formulas dogmas Some words follow the English rules: dogma 15 Why do you think this is so? Adapted from: ORESKà , A. et al. 2004. Activity Book

Music Pros and Cons Essay Example For Students

Music : Pros and Cons Essay Many issues lie conceding todays music. Parents complain about song lyrics and the message the song sends out to the youngsters of Americas society. Parents try to stop rappers like Mine, Jay-Z, and Jaw Rule from corrupting the minds of children. They say its gives them (children) ideas about drugs and crimes being that they are seeing there idols on TV rap about it. But on question I ask myself is are the parents right or are the rappers rapping the truth. I believe that it is the parents responsibility to kook after their children to guide them and to stay on top of what they are doing no matter what. Rappers like Mine have stated this. In Imines song I am he says they blame it on Marylyn and the heroin, but where were the parents. I believe he is correct in everyday. I believe that the parents are getting upset due to the fact that because they are not doing there Job which is raising kids the TV is doing it for them. Other rappers such as the former Tuba Shaker always spoke the harsh truth about life and the future. Because of this parents became alarmed that their children would grow up to deal drugs and perform illegal operations, Just because a rapper finally expressed how hard life is. If a parent does not want their children to listen to rap music then they should watch them and take responsibility for them instead of blaming it on someone else. Maybe Just maybe when the parents start to do that all the shoot outs in school will stop and the truth wont have to come out. Music : Pros and Cons By Expressway Contributor