1. Hydrogen sulfide, , burns in the presence of oxygen, , to produce water, , and sulfur dioxide, . Through this reaction, is sulfur oxidized or reduced?   2. Unsaturated fatty acids, such as , react...

1. Hydrogen sulfide,
, burns in the presence of oxygen,
, to produce water,
, and sulfur dioxide,
. Through this reaction, is sulfur oxidized or reduced?

2. Unsaturated fatty acids, such as
, react with hydrogen gas,
, to form saturated fatty acids, such as
. Are the unsaturated fatty acids being oxidized or reduced through this process?