FINAL QUESTIONS What would be the effect (+ or 0) on the calculated Resp for eac
ID: 992170 • Letter: F
Question
FINAL QUESTIONS What would be the effect (+ or 0) on the calculated Resp for each of the following? Please explain your reasoning in cach case (a) The magnesium strip is not pure magnesium but instead has a coating of magnesium oxide on its surface (b) At the end of the experiment the pressure is not equalized and the column inside the eudiometer tube is 5 cm higher than the level of the beaker. (See right) (c) Some Mg breaks free during the reaction and bubble to the top where it sticks to the side of the eudiometer tube. 2. What is the limiting factor in the significant figures of your final calculated value for R? How many significant figures does it limit your final answer to? 3. If we had run a reaction to generate HCl gas rather than H gas, would you expect to have a larger or a smaller % error? Explain in terms of the idea!gasassumptions.Explanation / Answer
1
a) If the Magnesium is not pure magnesium but has a caoating of magnesium oxide this magnesium oxide will not react so the amount of magnesium that reacts will be less than the weight that was taken in effect in the Rexp the denominator nH2 will be lower so Rexp will be higher so it will have a + effect on Rexp.
b) If the pressure is not equalised the measured volume of hydrogen will be lower than actual in effect in the Rexp equation the volume term will be lower so Rexp will be lower so this will have a - effect on Rexp.
c) If the Magnesium braks and sticks to the top we will have lesser Magnesium that reacts and so lesser hydrogen is produced so in the Rexp term nH2 will be lower and so Rexp term be be higher so this will have + effect on Rexp.
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