Using the balanced chemical equation below. 2Al2O3 --> 4Al + 3O2 How many moles of oxygen are produced if 11.0 mol of Al are produced?

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?

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?

40dm3 of gas at 760 torr are heated from 5°c to 50°c what is the new volume