What is the atomic mass of an oxygen isotope that has 8 protons and 10 neutrons in its nucleus?

List four observations that indicate that a chemical reaction may be taking place

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?

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?