What causes an electron in an atom to move to a higher energy level a. it emits a specific amount of light energy
b. it absorbs chemical energy
c. it absorbs a specific amount of light energy
d. it releases chemical energy

Urea, co(nh2)2, is manufactured on a large scale for use in producing urea-formaldehyde plastics and as a fertilizer. what is the maximum mass of urea that can be manufactured from the co2 produced by combustion of 1.00 x 104 grams of co2?

The reaction q+r2=r2q is found to be first order in r2 and

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?