What product would be formed if the four-membered alcohol which shown below was heated with an equivalent amount of hbr rather than with a catalytic amount of h2so4?

Is this a single replacement reaction or there is no

One does not belong why? ice, gold ,wood ,diamond and table salt

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?