Iron reacts with atmospheric oxygen to form iron oxide or ferric oxide. look at the chemical equation for this reaction: fe + o2 → fe2o3 this equation is unbalanced. which of the following is the correct balanced equation for this reaction?
4fe + 3o2 → 2fe2o3
3fe + 4o2 → 2fe2o3
2fe + 4o2 → 3fe2o3
3fe + 3o2 → 4fe2o3
4fe + 4o2 → 3fe2o3

The right answer is 4 Fe + 3O2 → 2 Fe2O3.

Triferium tetroxide is a chemical compound of formula Fe3O4. It is an iron oxide present in the natural environment in the form of magnetite, a crystallized black mineral; in the laboratory, it is generally in the form of a black powder.

b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.