Please enable JavaScript.
Coggle requires JavaScript to display documents.
REACTION, EXAMPLE, OVERALL, NET RATE FORMATION HBr
rnet
NET RATE…
REACTION
BRANCHING CHAIN
REACTION
Some propagation steps produce more chain carries than what they consumed, accelerating the reaction and sometimes producing an explosion
EXAMPLE
MECANISM OF HYDROGEN-OXYGEN REACTION 
-In step 5, M represents any molecule that can collide with H and O2.
-This could be an H2 or an O2 molecule
-it could be an impurity molecule if one is present
for step 2 and 3, it use up one chain carrier but provide two chain carries, the reaction rate is accelerated and an explosion can occur
-
-
CHAIN REACTION MECHANISM
STEPS:
1)Inigation: chain cariies formed
2)propagating: products formed, chain carries produced and being used up
3)termination: chain carries consume
EXAMPLE
INIGATION
Light ( hν ) can often be used to initiate chain reactions since they can generate free radical intermediates via a photodissociation reaction. The initiation step can be written as:
-
NET RATE FORMATION HBr
NET RATE FORMATION OF H
NET RATE FORMATION Br
SOLVE EQUATION
-
PROPOGATING
Elementary steps in which the number of free radicals consumed is equal to the number of free radicals generated are called chain propagation steps. Once initiated, the following chain propagation steps repeat indefinitely or until the reactants are exhausted:
TERMINATION
elementary steps that consume radicals. When reactants are exhausted, free radicals combine with one another to give stable molecules (since unpaired electrons become paired). These elementary steps are responsible for the chain reactions' termination:
At equilibrium, each mechanism must separately be at equilibrium with canceling forwand and reverse rates
-