Calculate the number of atoms of h in 22.5g of h2o

Schrodinger and heisenberg developed an alternate theory about atomic nature that contradicted some of bohr's model of the atom. how do changes resulting from new technology and evidence affect the reputation of the atomic theory?

Explain the relationship between forward and backward reactions in equilibrium, and predict how changing the amount of a reactant (creating a tension) will affect that relationship.

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?