What do acids do in solution?

What is the percentage by mass of silicon (si) in iron aluminum silicate (fe3al2(sio4)3)?

What is the mass of 8 moles of sodium atoms

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.