Two models of the same compound are shown. on the left labeled model a 2 large overlapping black spheres with 3 small blue spheres overlapping the rear black sphere and 2 medium red spheres overlapping the front black sphere. one of the red spheres has a small blue sphere overlapping it. on the right labeled model b 2 c's connected by a black line. the c on the left has 3 h's attached by 1 black line each and the c on the right has 2 os attached to it. the top o is attached by 2 black lines and the bottom o by 1 black line. the bottom o also has an h attached to it by 1 black line. in what way is model a better than model b? model a shows the types of elements in the compound, but model b does not. model a shows the total number of atoms in the molecule, but model b does not. model a shows the three-dimensional shape of the molecule, but model b does not. model a shows the number of atoms of each element in the molecule, but model b does not.

Oxidation-reduction reactions (often called "redox" for short) are reactions that involve the transfer of electrons from one species to another. oxidation states, or oxidation numbers, allow chemists to keep track of these electron transfers. in general, one element will lose electrons (oxidation), with the result that it will increase in oxidation number, and another element will gain electrons (reduction), thereby decreasing in oxidation number. the species that is oxidized is called the reducing agent or reductant. the species that is reduced is called the oxidizing agent or oxidant. to sum up: oxidation = increase in oxidation state = loss of electrons = reducing agent reduction = decrease in oxidation state = gain of electrons = oxidizing agent part a which element is oxidized in this reaction? fe2o3+3co→2fe+3co2 enter the elemental symbol. view available hint(s) is oxidized part b which element is reduced in this reaction? 2hcl+2kmno4+3h2c2o4→6co2+2mno2+2kcl +4h2o enter the elemental symbol. view available hint(s) is reduced