Complete the tables below to answer the hypothetical cases presented to you Case
ID: 1043148 • Letter: C
Question
Complete the tables below to answer the hypothetical cases presented to you Case 1: A student does not heat the magnesium sufficiently, leading to an incomplete formation of magnesium oxide. Indicate how each of the measurements and computations change (increase/decrease/no change Measurement or Computation Mass of crucible and lid Mass of crucible and lid with magnesium Mass of crucible and lid with magnesium oxide: Mass of magnesium Mass of oxygen Moles of magnesium Moles of oxygen Change increase/decrease/no chan increase/decrease/o chang increase/decrease/no change increase/decrease/no change increase/decrease/no change increase/decrease/no change increase/decrease/no change Case 2: A student does not realize that the scale reads "-0.050g" before massing the lid and the crucible. The scale was properly tared before subsequent measurements. Indicate how each of the measurements and computations change (increase/decrease/no change) Change increase/decrease/no change increase/decrease/no change increase/decrease/no change increase/decrease/no change increase/decrease/no change increase/decrease/no change increase/decrease/no change Measurement or Computation Mass of crucible and lid Mass of crucible and lid with magnesium Mass of crucible and lid with magnesium oxide Mass of magnesium* Mass of oxygen Moles of magnesium Moles of oxygen*Explanation / Answer
Case 1
Mass of crucible and lid : no change
Mass of crucible and lid with magnesium : no change
Mass of crucible and lid with magnesium oxide : decrease
Mass of magnesium: no change (no error in measurement)
Mass of oxygen: decrease (because of lower use of O2 due to incomplete oxidation)
Moles of magnesium: no change (moles won’t change without mass)
Moles of oxygen: decrease (moles decrease as mass decreases)
Case 2
Mass of crucible and lid : decrease (because actual weight should be more (+0.05 g in the case tare was 0.00 g)
Mass of crucible and lid with magnesium : no change (properly tared and measured)
Mass of crucible and lid with magnesium oxide : no change (properly tared and measured)
Mass of magnesium: increases (the error / decrease in crucible weight will increase the mass of measured magnesium)
Mass of oxygen: increase (increases as the magnesium oxide weight increases)
Moles of magnesium: increases (increases as the magnesium weight increases)
Moles of oxygen: increase (increases as mass of oxygen increases)
Case 3
Mass of crucible and lid : no change
Mass of crucible and lid with magnesium : no change
Mass of crucible and lid with magnesium oxide : decreases (escape of MgO lead decrease in the weight)
Mass of magnesium: no change (no error in measurement)
Mass of oxygen: decrease (because of the escape of MgO)
Moles of magnesium: no change (moles won’t change without mass)
Moles of oxygen: decrease (moles decrease as mass decreases)
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