C5h9o+o2=co2+h2o reaction type

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.

What are the similarities of physical and chemical change ?

Joan writes four numbers on the board in standard form, and then she writes their scientific notation