Calculate the potential (emf) of a working galvanic cell that is based on these two half cells and standard potentials (both written as reduction reactions) in an aqueous solution. Cr3+(aq) → Cr2+(aq) E°(Cr3+/Cr2+) = −0.50 V IO2−(aq) → I2(aq) E°( IO2−/I2) = +1.80 V The pH of this cell is 14, and the concentrations of species are: Cr3+ is 0.5 M, Cr2+ is 0.2 M, IO2− is 0.5 M and I2 is 0.8 M.

Many radioactive atoms that have large masses undergo radioactive decay by releasing a particle that is identical to a helium-4 nucleus. what changes in the original atom are expected as a result of this natural phenomenon? the atomic number and the mass number will decrease. the atomic number and the mass number will increase. the atomic number will increase, and the mass number will decrease. the atomic number will decrease, and the mass number will increase.