Open Question: Chemistry cell potential?
In acid medium H+ ions and water are added to half-reactions to balance the overall reaction. For example, when manganese reacts with sodium bismuthate.
Unbalanced reaction: Mn2+(aq) + NaBiO3(s) ? Bi3+(aq) + MnO4–(aq)
Oxidation: 4 H2O(l) + Mn2+(aq) ? MnO4–(aq) + 8 H+(aq) + 5 e–
Reduction: 2 e– + 6 H+(aq) + BiO3–(s) ? Bi3+(aq) + 3 H2O(l)
Finally, the reaction is balanced by multiplying the number of electrons from the reduction half reaction to oxidation half reaction and vice versa and adding both half reactions, thus solving the equation.
8 H2O(l) + 2 Mn2+(aq) ? 2 MnO4–(aq) + 16 H+(aq) + 10 e–
10 e– + 30 H+(aq) + 5 BiO3–(s) ? 5 Bi3+(aq) + 15 H2O(l)
Reaction balanced:
14 H+(aq) + 2 Mn2+(aq) + 5 NaBiO3(s) ? 7 H2O(l) + 2 MnO4–(aq) + 5 Bi3+(aq) + 5 Na+(aq)
Open Question: 8. Which of the following is not an example of potential energy?
A. The energy stored in a pile driver.
B. The energy stored in a stretched spring.
C. The energy of a body moving across a horizontal surface.
D. The energy in the water at the top of a waterfall.
Open Question: As a gasoline engine is running, an amount of gasoline containing 15,000 J of chemical potential energy?
cindy Member since:February 20, 2011Total points:40 (Level 1)As a gasoline engine is running, an amount of gasoline containing 15,000 J of chemical potential energy is burned in 1.0 s. During that second, the engine does 3100 J of work. (a) What is the engine’s efficiency? (b) The burning gasoline has a temperature of about 2500 K. The waste heat from the engine flows into air at about 290 K. What is the Carnot efficiency of a heat engine operating between these two temperatures?Answer QuestionBe the first to answer this question.
Open Question: An action potential is caused by an influx of these ions into the cell:?
Probably the closest thing to magic we'll ever see.
