Which of the following is an example of a physical change?
a. dissolving salt in water.
c. cooking an egg.
b. burning wood into charcoal.
d. rusting iron.

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?

If you burn 46.6 g of hydrogen and produce 416 g of water, how much oxygen reacted

How can liquids be seperated by density a the liquids are absorbed onto a paper b the liquids are turned into seperate vapors c the liquids are collected as they evaporate d the liquids are allowed to seperate into layers