When a voltaic cell changes to begin operating as an electrolytic cell, A. the positive electrode changes from being the cathode to being the anode.
B. the negative electrode becomes both the anode and the cathode.
C. the positive electrode changes from being the site of oxidation to being the site of reduction.
D. the negative electrode becomes the site of both oxidation and reduction.
Hurry please it is timed

Darla claims that the first periodic table developed by mendeleev was not completely accurate, so it is not useful at all. harmony argues that it establish the periodic table we use today, making it more credible. who is correct and why? darla is correct, because a model that has any mistakes should be thrown out. darla is correct, because a good model would not need to change. harmony is correct, because mendeleev’s model had all of the information correct in the first version. harmony is correct, because mendeleev’s model made predictions that came true.

Both josef loschmidt and amedeo avogadro contributed to our understanding of basic molecular numbers, sizes, and reaction ratios. neither scientist discovered “avogadro’s number” in the form we use it today (6.02 x 10 23). still, there’s a controversy over the name. research the contributions from these two scientists and read about how avogadro’s number got its name. briefly state what you think this number should be called, providing key details of each scientist’s contributions to this concept and a solid rationale for your case in naming the number.

If a solution had a ph of 7 what is the solution