free radicals

Question 1

Write two equations to show how this reactive intermediate is involved in catalysing
the decomposition of ozone.
1. _____________________

Answer 1

Cl* + O 3 → ClO* + O 2
Equations can be in either order
Penalise absence of * once only
1
ClO* + O 3 → 2O2 + Cl*

Question 2

Write two equations to show how bromine atoms (Br*) act as a catalyst in the
decomposition of ozone.
Explain how these two decomposition equations show that bromine atoms behave as
a catalyst.
Equation 1
______________________________________________________________
Equation 2
______________________________________________________________
Explanation __

Answer 2

Br* + O 3 BrO* + O 2
M2
BrO* + O 3 Br* + 2O 2

Question 3

Electronegativity

Answer 3

The (relative) tendency of an atom to attract a pair of electrons/ the electrons/
electron density in a covalent bond