A spontaneous reaction occurs

Which produce would best increase the amount of heat energy that is actually gained by calorimeter b

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 happens to isotopes that are unstable?