Many elements show very strong similarities to each other.<span>For example, lithium (Li), sodium (Na), and potassium (K) are all soft, very reactive metals.
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The correct answer for above statement is:
D. Small Nonmetal Atoms.
Explanation:
In the same way, when an atom gains electrons, an energy change occurs. Learn that the description of an electron affection is the strength delivered, so that means that the reaction is exothermic. If a reaction is exothermic, the change in charge is negative. This suggests that the electron affinity is positive.
Answer: a) Anode:
Cathode:
b) Anode : Cr
Cathode : Au
c)
d)
Explanation: -
a) The element Cr with negative reduction potential will lose electrons undergo oxidation and thus act as anode.The element Au with positive reduction potential will gain electrons undergo reduction and thus acts as cathode.
At cathode:
At anode:
b) At cathode which is a positive terminal, reduction occurs which is gain of electrons.
At anode which is a negative terminal, oxidation occurs which is loss of electrons.
Gold acts as cathode ad Chromium acts as anode.
c) Overall balanced equation:
At cathode: (1)
At anode: (2)
Adding (1) and (2)
d)= -0.74 V
= 1.40 V
Using Nernst equation :
where,
n = number of electrons in oxidation-reduction reaction = 3
= standard electrode potential = 2.14 V
Thus the standard potential for an electrochemical cell with the cell reaction is 2.14 V.