Whe. does water have its highest density

In the following reaction, identify the species that are oxidized, those that are reduced. In addition, complete the half reactions associated with each reaction by indicating the stoichiometry of each species in the reaction.

CH3CH2CHO + NADH + H+ → CH3CH2CH2OH + NAD+

Which species is oxidized?

CH3CH2CH2OH is oxidized

NAD+ is oxidized

NADH is oxidized

CH3CH2CHO is oxidized

2) Which species is reduced?

CH3CH2CH2OH is reduced

NAD+ is reduced

NADH is reduced

CH3CH2CHO is reduced

3) Choose the correctly balanced half reactions.

(Select all that apply.)

2CH3CH2CHO + 2H+ + 2e- → 2CH3CH2CH2OH

2NADH + H+ + 2e- → 2NAD+

NADH → NAD+ + H+ + 2e-

CH3CH2CHO + 2H+ + 2e- → CH3CH2CH2OH