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Tutor profile: Micah O.

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Micah O.
Organic Synthesis Graduate Student
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Questions

Subject: Organic Chemistry

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Question:

1) Assign priority for the following substituents: CH3, OH, CHO, C2H5 2) How would one add an OH to a molecule with a double bond? (OH added to either side of the double bond)

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Micah O.
Answer:

1) OH>CHO>C2H5>CH3 2) Hydration alkene reaction where the alkene becomes an alkane with a hydroxy (OH) substituent. This is done with the following reagents: H+/H2O, or 1)BH3 2)H2O2, NaOH, or X2, H2O (this also installs an X on the other C of the double bond).

Subject: Chemistry

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Question:

A2(g) + B2(g) ⇄ 2AB(g) Kc = 0.65 (at 200ºC) A2, B2, and AB were placed into a constant volume container at 200ºC such that the initial concentrations of A2, B2, and AB are respectively: 0.076 M, 0.076 M and 0.48 M. Determine the following. For the above equation and conditions answer the following questions: 1) Is the system at equilibrium? Explain. 2) If the system is not at equilibrium, describe the shift that will occur to achieve equilibrium. 3) Calculate the concentrations of A2, B2, and AB at equilibrium.

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Micah O.
Answer:

1) Calculate Qc to determine if the system is at equilibrium. If Qc equals Kc, the reaction is in equilibrium. Qc = [products]/[reactants] Qc = (0.48)(0.48)/(0.076)(0.060) = 39.8 Since Qc ≠ Kc the system is not at equilibrium, instead there are more products than reactants. 2) Since Qc > Kc there are more products than reactants, so the equilibrium would shift towards the reactants (left). 3) To determine equilibrium concentrations, set up an ICE table. A2(g) + B2(g) 2AB(g) I 0.076 M 0.076 M 0.48 M C +x +x -2x E 0.076 M +x 0.076 M +x 0.48 M -2x Kc = (AB)2/[(A2)(BI2)] = 0.65 0.65 = (0.48 M - 2x)2 / (0.076 M + x)2 Since this is a perfect square, take the square root of both sides to solve for x: 0.81 = (0.48 M - 2x) / (0.076 M + x) And x = 0.15 A2 = 0.076 + x = 0.23 M B2 = 0.23 M AB = 0.33 M

Subject: Basic Chemistry

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Question:

Name the following compounds: 1) K2CO3 2) HCl 3) Mn2(SO3)3 Write the formula for the following compounds: 4) Beryllium hydroxide 5) Carbonic acid 6) Silver Cyanide

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Micah O.
Answer:

1) Potassium Carbonate 2) Hydrochloric acid 3) Manganese (III) Sulfite 4)Be(OH)2 5) H2CO3 6) AgCN

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