An electrochemical cell is powered by the half reactions shown below. ag+(aq) + e– mc017-1.jpg ag(s) eo = +0.80 v pb2+(aq) + 2e– mc017-2.jpg pb(s) eo = –0.13 v which value represents the overall electric cell potential? use emc017-3.jpgcell = emc017-4.jpgred, cathode – emc017-5.jpgred, anode. –0.13 v –0.93 v +0.67 v +0.93 v

Both 1,2−dihydronaphthalene and 1,4−dihydronaphthalene may be selectively hydrogenated to 1,2,3,4−tetrahydronaphthalene. one of these isomers has a heat of hydrogenation of 101 kj/mol (24.1 kcal/mol), and the heat of hydrogenation of the other is 113 kj/mol (27.1 kcal/mol). match the heat of hydrogenation with the appropriate dihydronaphthalene.

The formation of a solid, also known as a is an indication of a chemical change. precipitate particulate particle powder

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.