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Experiment 5 -Determination of the Empirical Formula of Magnesium Oxide When atomic number 12 and type O are heated together, they readily suffer a chemical change ( response): atomic number 12 + group O ( atomic number 12 oxide (Rxn.1) From the pile of milligram and group O that combine, we can calculate the empirical radiation diagram of magnesium oxide. We get out weigh the magnesium onwardhand it combines with the oxygen, and we will also weigh the product of the response, magnesium oxide. The final muffledness is necessary because we need to subtract the original weight of magnesium from this weight of product. We weigh the oxygen in this indirect make for because it is easier to do than to try to weigh the oxygen gas before it combines with the magnesium. If magnesium is heated in open air, its chemical reaction with oxygen is rapid and spectacular. The metal catches fire, burning with an intense white cave in open and with produc tion of white smoke. (The metal has been used in flares to put up light for night-time military operations.) We can slow down the reaction by limiting the supply of oxygen that reaches the magnesium; we do that by putting a put out on the crucible that contains the magnesium sample. Our procedure in this experimentation is complicated by another fact.

Magnesium is such an wide awake metal that it reacts with the relatively inactive element nitrogen: magnesium + nitrogen ( magnesium nitride (Rxn. 2) This occurs in competition with the reaction of magnesium with oxygen, so it is called a side react ion. You should realize that this side react! ion uses up more or less of the magnesium that is speculate to be combining with oxygen. Fortunately it is realistic to undo the reaction in this way: magnesium nitride + water ( magnesium hydroxide + ammonia (Rxn. 3) and magnesium hydroxide ( magnesium oxide + water vaporisation (Rxn. 4) To get reactions (3) and (4) to occur, we add water to the crucible contents at the end of the first heating period. We then...If you demand to get a full essay, order it on our website: OrderCustomPaper.com

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