An increase in the temperature will speed up the reaction by increasing the frequency and efficiency of the collisions of molecules.
Oxidation is the Loss of Electrons, and Reduction is the Gain of Electrons
(Remember oil rig - Oxidation Is Loss, Reduction Is Gain)
Since water loses an electron, it gets oxidised, and since carbon dioxide gains an electron, it gets reduced.
Since both oxidation and reduction occurs, it is called a Redox reaction
Density is mass per unit volume
2.4=8.5/v
V=8.5/2.4
V=3.54
We can write the balanced equation for the galvanic cell by using the oxidation and reduction half-reactions. In the anode, Ni(s) is oxidized and produces aqueous Ni2+:
Ni(s) → Ni2+
while in the cathode, Cu2+ is reduced and deposits copper:
Cu2+ → Cu(s)
We now balance the charge of each reaction by adding electrons to the side of the equation with the greater charge:
Ni(s) → Ni2+ + 2 e-
Cu2+ + 2 e- → Cu(s)
Finally, we add the half-reactions to obtain the overall balanced equation for the galvanic cell:
Cu2+(aq) + Ni(s) → Ni2+(aq) + Cu(s)