Plz help...Use the balanced equation to calculate how many grams of H2 can be produced when 4 moles of H2O react. show work and
a correct answer.
Ca + 2H2O + Ca(OH)2 + H2

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?

Explain that newton first law,second law and third law of motion?

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms