how many grams of Fe are needed to react with 8.0g of O2 to produce 28.9 g of Fe3O4 according to the equation 3Fe+2O2—> Fe3O4

Ahigh energy (high speed) particle (alpha or beta or neutron) are shot at the target;

Van der waals forces are temporary electromagnetic forces established between uncharged atoms. some neutral molecules, when close together, can become temporarily “charged,” as electrons move around the atom. water is a polar molecule, the side of the molecule that the hydrogens bond to being more positive, and the opposite side bound to the lone pairs of electrons being more negative. this means that it participates in dipole-dipole interaction (non-polar exhibits dispersion forces), and it has the capacity for hydrogen bonding.

Sorry im just trying to get answers like you are 

Electrons are evenly distributed in the water molecule.