An electrochemical cell is composed of pure copper and pure lead electrodes immersed in solutions of their respective divalent ions. for a 0.8 m concentration of cu2+, the lead electrode is oxidized yielding a cell potential of 0.500 v. calculate the concentration of pb2+ ions if the temperature is 25˚c. the standard potentials for cu and pb are +0.340 v and -0.126 v.

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The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

How does the viscosity of magma change as magma cools?