Which species is oxidized in the following reaction? CO2 + H2 → CO + H2O A. H B. CO2 C. C D. O

it should be option A. H

[ because H gained oxygen ( O ) ]

Oxidation is defined by :

- the loss of electrons

- the loss of hydrogen ( H )

- the gain of oxygen ( O )

- increase in oxidation state

Reduction is defined by :

- the gain of electrons

- the gain of hydrogen ( H )

- the loss of oxygen ( O )

- decrease in oxidation state

(Basically, oxidation n reduction is opposite of each other)

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a