The crucible is not fired, as the procedure suggests, but had retained some impu

Question

The crucible is not fired, as the procedure suggests, but had retained some impurities from previous use (or it could be oily smudges from fingers). The mass of "dirty" crucible is recorded. However the impurities are burned off in the experiment. Will the reported mass of the final product be too high, too low, or unchanged as a result of this technique error? Explain. In a hurry to complete the experiment, Sylvia did not allow all of the magnesium to react. Will her reported magnesium to oxygen (Mg: O) ratio be too high, too low or unaffected? Explain.

Explanation / Answer

Q1.Part A.1

Ans:

Q2.part B.3.

ans:

the equation is :

Magnesium + Oxygen ---> magnesium oxide

Mg + O2 ----> 2MgO

sometimes we get unconvincing results to this experiment.

the majority of the class results should fall on or near the line representing the formula MgO , a 1:1 ratio.

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