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home / study / science / chemistry / questions and answers / 1. if magnesium is burned under pure nitrogen, ... Question: 1. If Magnesium is burned under pure nitrogen, a b... 1. If Magnesium is burned under pure nitrogen, a black powder, Mg3N2 is produced. Why then is the product gray when Mg(s) is burned in air? 2. In step 8, why is it important to allow the crucible to cool before water is added? (Hint: What is likely to happen if cool water is poured into a hot porcelain crucible?) 3. Halfway through his Conservation of Mass experiment, a Joe E. Cool realized that he forgot to weigh his crucible after heating it. Short of starting over, what can Joe do to ensure accurate results? Be specific and detailed in your answer. 4. Joe burned his magnesium sample and obtained a light gray product. Since his crucible looked dirty anyway Joe skipped the step of heating to constant mass, weighed the gray sample, and calculated the mass of the product. Was his resulting mass likely to be high or low?
Oxidation of Magnesium
Magnesium is a very reactive element that tends to form +2 cations. When burned in air, it produces a very bright white light. When burned under different conditions, it can form different kinds of compounds, depending on which oxidizing agents are available.
Answer and Explanation: 1
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View this answer1. If you burn Mg in air, it will form MgO instead of Mg3N2, since oxygen is a stronger oxidizing agent.
2. Letting the crucible cool ensures that...
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