21.5g of sodium chloride dissolves in 60g of water
at25C. Calculate the
concentration of the solution. PLS ANSWER for 30 point.

Is this a scientific model? use complete sentences to explain why or why not. a graphic organizer showing the water cycle

Three alkali metals in group 1 are a. calcium, strontium, barium b. boron, aluminum, gallium c. sodium, potassium, rubidium d. fluorine, iodine, chlorine

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?