What is a diatomic molecule

Harvey mixes two liquids. which observation of the new mixture most likely indicates a precipitate is forming?

What is the relation between concentration of reactants and the rate of chemical reaction?

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.