Which halogen is most likely to react?
a. br (bromine)
b. f (fluorine)
c. i (iodine)
d. cl (chlorine)

Compare and contrast physical changes with chemical changes.

Summarize possible ways in which phases of matter could combine to form a solution.

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?