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Author Archives: Anonymous

Refer to the following standard reduction reactions when ans…

Refer to the following standard reduction reactions when answering this question: Cr2O72−(aq) + 14 H+(aq) + 6e− → 2 Cr3+(aq) + 7 H2O(l)   E˚ = +1.33 V I2(s) + 2e− → 2 I−(aq)             E˚ = +0.53 V For the cell:  Pt(s) | I−(aq) | I2(s) || H+(aq), Cr2O72−(aq), Cr3+(aq) | Pt(s) at 298 K, the Ecell was measured to be 0.89 V. If [Cr2O72−] = 2.0 M, [H+] = 1.0 M; [ I−] = 1.0 M, then the [Cr3+] is closest to

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This question is worth 10 extra credit points. The following…

This question is worth 10 extra credit points. The following extra credit question is worth 10 points. 1) (5 points) Provide a balanced chemical equation for the following: Solid magnesium reacts with oxygen gas to produce aqueous magnesium oxide. Full points are granted for a correctly balanced equation that includes correct chemical formulas, states of matter, equation setup, and proper balancing. 2) (5 points) Describe a procedure to make 750 mL of a 1.0 M solution of magnesium oxide. The following materials are available in lab: balance, scoopula, weigh tray, volumetric flask, 100.00 g solid magnesium oxide powder, 1.00 L of 5.0 M aqueous solution of magnesium oxide, 1.0 liter of water, graduated cylinder. Please note that there are several ways this solution can be made, and not all materials need to be used.  Full points are granted for providing correct amounts, and a correct procedure that can be replicated by another student in lab.

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