Which of the following is an example that a chemical reaction has occurred? A. Cut piece of lumber into two pieces
B. Bubbling/fizzing
C. Phase change (ex. solid changes to liquid)
D. Iron being melted

In the millikan oil drop experiment they determined that every drop had a charge which was a while number multiple of -1.60x10^-19. if a drop has a total charge of -9.60x10^-19 then how many excess electrons are contained within the drop?