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how do we get alkanes to react
free radical substitution
what does free radical substitution turn alkanes into
halogenoalkanes
define a mechanism
a reaction which takes place over several steps
what is stage one of free radical substitution
initiation
what does initiation of free radical substitution require
UV light
what is the role of UV light in chlorification
excites the electron, breaking the covalent bond
define radical
excited, unpaired electron
give the equation for the initial stage of free radical substitution
Cl2 —> 2Cl.
what is stage two of free radical substitution
propagation
give the two equations for propagation in chlorification of methane
Cl. + CH4 —> HCl + .CH3, .CH3 + Cl2 —> Ch3Cl + Cl.
define a chain reaction
where the product of one reaction is the reactant of another
What is the name for stage three of free radical substitution
termination
Give 3 equations as an example of termination in chlorification of methane
Cl. + Cl. —> Cl2, .CH3 + Cl. —> CH3Cl, .CH3 + .CH3 —> C2H6
How does the reaction end
randomly, cannot be forced
What must the products of free radical substitution not be
radicals
Note 
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