Ground water has some minerals dissolved in it. if you heat this water, collect the vapor in another container, and then cool it, you will get pure, or distilled, water. what makes this process a physical change

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?

Condensation happens when water vapor cools. true or false? ?

The compound formed from 2 atoms of hydrogen and one atom of oxygen is