Percentage Composition by Mass of Magnesium Oxide Essay

Percentage report card by mass of milligram oxide Report Objective To measure and play the ratio of magnesium to oxygen in magnesium oxide. To compare the testing ground ratio to the percent composition calculation based on the formula. conjecture 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 woolen* Porcelain crucible and lid* Bunsen Burner* Retort hurt* Ring Stand and Clamp* Clay Triangle* crucible Tongs* Glass intake Rod * Distilled WaterCalculations + ObservationPlease see the back of the report. interventionB) The fact that magnesium oxide was formed, which is a new substance, proved that a chemical substance reaction had taken place. E) Yes, the law of definite proportions is valid, because most of the other groups that had not encountered as many errors as us and they had more accurate results wh ich were scalelike to the predicted compositions according to the law. The rilievo had similar results to us which proves that their errors were similar to ours. H) The white withdraw on the surface of the magnesium was polished because it restrains reactions of magnesium and gas elements in the air. This was necessary because we wanted magnesium to react with oxygen and therefore had to stumble the white film.ConclusionJ) 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 strike to be actually precautious while doing this experiment. Here are reasons/possible errors that could afford been encountered * The magnesium oxide could have been lost through the crucible during the heating process. This could result in the going of the p magnetic poleuct. 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 used to crush the magnesium, there is a high chance that the magnesium oxide could have been left on it before adding the water, resulting in the loss of product. To prevent this, the stirring rod should be held above the crucible and then teem the water slowly on to the end of the stirring rod so that the water would run down into the crucible while dragging the MgO from the stirring rod. * Magnesium could have not reacted with oxygen completely. * The crucible might 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 powder after reaction.* rushing through experiment because of lack of time.* Chance of Problem with weighing scale.* Crucible had extra weight due to extra contents that were unseen.