Potential energy<span> is the </span>energy<span> that is stored in an object due to its position relative to some zero position. It is calculated by the expression as follows:
PE = mgh
PE = 25 (9.8) (3)
PE = 735 J
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Answer: nS2
Explanation: The valence electronic configuration of group 2a elements is "nS2",they have a complete filled "S" orbital with 2 valence electrons. e. g, Berrylium = 1s2 2S2, Calcium = 1s2 2s2 2p6 3s2 3p6 4s2
Answer:
b. spontaneous.
c. spontaneous.
Explanation:
Using the net standard potential, it is possible to determine if the reaction is spontaneous or not. If the standard potential of the reaction is positive, the reaction is spontaneous, whereas if the standard potential of the reaction is negative, the reaction is non-spontaneous.
a. Ni(s)+Zn2+(aq)→Ni2+(aq)+Zn(s) E° = - 0.53 v
b. Pb(s)+Mn2+(aq)→Pb2+(aq)+Mn(s) E° = + 0.10 v
c. Ni(s)+Pb2+(aq)→Ni2+(aq)+Pb(s) E° = + 2.46 v
d. Cr(s)+3Ag+(aq)→Cr3+(aq)+3Ag(s) E° = - 1.05 v