Many metals react with oxygen gas to form the metal oxide. For example, calcium reacts as follows: 2Ca(s) + O2(g) → 2CaO(s)

Calculate the mass of calcium oxide that can be prepared from 7.52 g of Ca and 5.01 g of O2.

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.

particle   p is an electron and particle q is a neutron