If the pressure is initially 0.850 atm before the addition of the gas and the position of the piston does not change, what is the new pressure inside of the cylinder?

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.