The following half-reactions are joined to form a galvanic cell that generates a current under standard conditions. Identify what is oxidized and what is reduced. Write a shorthand cell diagram, and calculate the standard cell potential (E°).
2 H+(aq) + 2 e- → H2(g) and Ni2+(aq) + 2 e- → Ni(s)

Imagine that twenty i. u.’s of enzyme z were catalyzing the above reaction for one minute, under vmaxconditions, in a 3.00 ml assay volume. the assay is buffered with 20 mm phosphate buffer, ph 7.60. what will the ph be at the end of that one minute?

16. why must the number of electrons lost equal the number of electrons gained in every redox reaction? use 3 – 4 sentences in your own words to address this question. 18. what type of radiation is emitted when chromium-51 decays into manganese-51? show the nuclear equation that leads you to this answer. 19. a radioactive nucleus alpha decays to yield a sodium-24 nucleus in 14.8 hours. what was the identity of the original nucleus? show the nuclear equation that leads you to this answer.

Air can be considered a mixture. which statement does not explain why?