Drag the tiles to the correct boxes to complete the pairs. Chromium is a transition metal, and oxygen has an oxidation number of -2. Use this information to match each compound to its chemical formula.

chromium(VI) oxide
chromium(IV) oxide
chromium(III) oxide
chromium(II) oxide

Consider the point on the plot where 10.0 g of naoh have been added. what amount of naoh, in moles, has been added? 0.308 mol fecl3 initially present

Iknow the answer is a but i don't know why

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?