Hich statement correctly describes a chemical equilibrium? it must take place in an open system. the mass of the reactants and the mass of the products are equal. it is affected by the addition of a catalyst. it does not involve a reversible reaction. the concentrations of reactants and products are equal.

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

answerspecific gravity;