Chemistry Worksheet Higher Level Paper 3 - Ib Global Centre, 2004 Page 13
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N04/4/CHEMI/HP3/ENG/TZ0/XX
D4. The natural concentration of ozone in the upper atmosphere is kept unchanged by a sequence of
reactions, including the following:
λ
=
242 nm
→
→
+
reaction I:
O
2O
reaction II :
O
O
O
2
3
2
The bonding in the ozone molecule can be represented as two resonance hybrids, one of which is
shown below.
O
O
O
(a)
Draw a Lewis structure for the oxygen molecule.
[1]
(b)
By reference to the bonding in ozone and oxygen, state and explain whether the wavelength
and energy of the radiation required for reaction II would be less than or greater than that
required for reaction I.
[3]
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