Worksheet
No.____
Higher Atmosphere (Stratosphere)
class
Ozone: formation & destruction
name
date
The Chapman-cycle
In the stratosphere ozone is always formed and destroyed. The English mathematician and geophysicist
Sidney Chapman investigated and described this cycle. Because of that this cycle is named "Chapman-cycle".
T1 Add the missing words in the text.
The missing words are:
ozone molecule
oxygen atom
oxygen molecule
; ozone molecules; cracking of ozone;
; oxygen atom; oxygen atoms; oxygen atoms;
; oxygen molecule; oxygen molecule;
oxygen molecules; UV-light
; UV-light; warmth; warmth;
wavelength
1) High-energy (short wave) UV-light can crack
oxygen molecules______ into __oxygen atoms___.
2) By a "triple collision", if a ___oxygen atom_______, a
___oxygen molecule_______ and a heavy weight particle
impact, a ____ozone molecule______ is formed.
The heavy weight particle
can be a dust particle, or
another big gas molecule.
3) The heavy weight particle has the task, to take over the
______warmth________ ,which becomes free during the
ozone formation.
It delivers the ______warmth________slowly to the
environment afterwards.
4) ____ozone molecules______
can be cracked likewise by
____UV-light_________.
The ____UV-light_________needed by this does not need to
have as much energy than to crack oxygen molecules.
The ____wavelength___may be larger.
The products of this _cracking of ozone__are an
___oxygen molecule_______ and an___oxygen
atom_______.
5) Do two ___oxygen atoms_______impact, an
___oxygen molecule_______ is formed.
T2 Explain briefly which form of energy is in the stratosphere
converted into warmth by the Chapman-cycle.
In the stratosphere energy of light (UV-light of
solar radiation) is converted into chemical
energy
© 2004 ESPERE-ENC / Seesing, Tausch, Universität-Duisburg-Essen; Duisburg
by the splitting of oxygen molecules or ozone molecules. The chemical energy is
converted into warmth by the triple collision, the formation of ozone, and by the
formation of oxygen molecules.
Altogether the energy of light is converted into
warmth in the stratosphere.
© 2004 ESPERE-ENC / Seesing, Tausch, Universität-Duisburg-Essen; Duisburg