sample of three gas H2(g), I2(g), and HI(g) were combined. the original value of the reaction Qc before the equilibrium established was 5.56. initial concentration H2=0.030(M), I2=0.015(M), HI ?

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?

How are the terms group and period used on the periodic table

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?