The amount of C2H2 in a smoggy atmosphere was measured to be 241 ppm. The barometric pressure was 723.4 Torr. Compute the partial pressure of C2H2 in Torr

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?

One way that radioactive waste is treated is by burying it in repositories. the repositories are found only in states with very low populations. true or false? a. trueb. false(also i meant to put high school but it put down middle school instead)

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.