25 ! fast
why is the symbol e ^ o oxid used to show the standard reduction potential of an oxidation reaction in a half cell.

in pick its the second option

What are the spectator ions in 2h+ + so42- + ca2+ + 2r → caso4 + 2h+ + 21?

Ab c or d ? i’m not sure what the answer is

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?