Is 2AI + 3O2 = 2AI2O3 balanced or unbalanced

Which of the following statements is true about planck’s law

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?

Explain what happens at the saturation point when adding salt to water at room temperature.