Dobierz współczynniki stechiometryczne w równaniach reakcji chemicznych PRZYKŁAD: Na + O2 →Na2O 4Na + O2 →2Na2O a) Na + S → Na2S b) Al + S →Al2S3 c) I2O5 → I2 + O2 d) AuCl → Au + Cl2 e) Fe3O4 + H2 → Fe + H2O f) CrO3 + C →Cr + CO2

Does the energy in a solid increase or decrease when changing to a liquid?

Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.

Which of the following has wavelength longer than the wavelength of viable light? a) x rays b) gamma rays c) radios waves d) ultraviolet waves