Which answer best describes what is happening in the following redox reaction? 4Fe + 3O2 Right arrow. 2Fe2O3
This is combustion.
This is neutralization.
Iron is oxidized to form rust.
Oxygen is oxidized to form rust.

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.