The balanced equation below represents a reaction.

o2(g) + energy ==> o(g) + o(g)

54 identify the type of chemical bond in a molecule of the reactant. [1]
55 in the space in your answer booklet, draw a lewis electron-dot diagram of one oxygen atom. [1]
56 explain, in terms of bonds, why energy is absorbed during this reaction. [1]

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.

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.

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally