A science teacher performed a demonstration in which a CaCl2 solution reacts with a Na2S04 solution to form solid Cas04 and a NaCl solution.
Does the reaction above obey the law of conservation

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?

Drug abuse will not lead to physical and psychological dependence. true or false ?

Acontrol during an experiment. might change remains constant does not exist does change