Percentage Composition by Mass of Magnesium Oxide Essay

office typography by mass of milligram oxide Report Objective To measure and prognosticate the proportion of atomic number 12 to group O in magnesium oxide. To compare the lab ratio to the percent composition calculation base on the formula. Hypothesis Based on the law of definite proportions, the percentage composition of magnesium oxide should be around 60% magnesium and 40% oxygen.Materials* Goggles* Centigram or analytical balance* 2-4 cm magnesium ribbon* Steel Wool* Porcelain melting pot and lid* Bunsen Burner* Retort contribute* Ring Stand and Clamp* body Triangle* Crucible Tongs* wish-wash Stirring Rod * Distilled WaterCalculations + annotationPlease see the back of the report. word of honorB) The fact that magnesium oxide was formed, which is a naked substance, proved that a chemical reaction had taken place. E) Yes, the law of definite proportions is valid, because some of the early(a) groups that had not encountered as numerous delusions as us and they had more entire results which were closer to the predicted compositions according to the law. The consist had alike results to us which proves that their errors were similar to ours. H) The white consume on the surface of the magnesium was slight because it prevents reactions of magnesium and gas elements in the circularise. This was demand because we wanted magnesium to react with oxygen and therefore had to remove the white film. closingJ) Yes, the law of definite proportions is valid, because most of the other groups that had not encountered as many errors as us had more accurate results. The rest had similar results which proves that their errors were similar as well. Sources of errorYou demand to be very precautious patch doing this essay. Here are reasons/possible errors that could feed been encountered * The magnesium oxide could have been lost by dint of the crucible during the heating process. This could result in the sledding of the product. To prevent this, the lid should be set slightly off-center on the crucible so that only the air goes in.* When the glass stirring rod was employ to crush the magnesium, there is a advanced chance that the magnesium oxide could have been left hand on it before adding the body of peeing, resulting in the loss of product. To prevent this, the stirring rod should be held above the crucible and then well out the water slowly on to the suppress of the stirring rod so that the water would run down into the crucible art object dragging the MgO from the stirring rod. * magnesium could have not reacted with oxygen completely. * The crucible readiness be left dirty with other particles in it that could have made variations in the MgO reaction.* The water could be contaminated.* All water might not have evaporated.* Magnesium having not been crushed completely into mill after reaction.* Rushing through experiment because of lack of time.* Chance of Problem with deliberation scale.* Crucible had extra w eight payable to extra contents that were unseen.