In an electrolytic cell, the electrode that acts as a source of electrons to the solution is called the ; the chemical change that occurs at this electrode is called .

a) anode, oxidation
b) anode, reduction
c) cathode, oxidation
d) cathode, reduction
e) cannot tell unless we know the species being oxidized and reduced.

D. cathode; reduction

Explanation:

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the ratio of the conjugate base to the acid required to attain the desired ph.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3