OCR Chemistry F332 Atmosphere


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  • Created on: 20-05-12 21:40
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Avogadro's constant= 6.02x1023
Energy of 1 bond = Bond enthalpy x 1000/ Avogadro constant
Energy of 1 bond
2 of 13
1 of 13
Molecules and Energy
Photons of electromagnetic radiation hit matter and transfer energy to it. The energy absorbed
causes changes to happen in the matter. The photons of different energy cause different changes
in the matter.
· Electronic
· Vibrational
· Rotational
· Translational
These energy levels are quantised as only certain fixed energy levels are possible. By absorbing
photons of a specific frequency or energy the molecule is able to move to a higher energy level.

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However is ozone was present at ground levelit would be an ashma trigger and also very corrosive
Ozone or O3 is the most important at doing this.
of the suns harmful radiation from reachinghte earths surface.
The Atmosphere is a good sun screen as gasses absorb the uv radiation strongly, preventing much
long lasting, waterproof, nice smell....…read more

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2. Ozone molecules can photodissociate when they absorb uv radiation with frequencies in the
1. an ozone molecule can combine with an O radical to form 2 O2 molecules
Once produced it can be destroyed in 2 ways
2. The 2 radicals can recombine to form O2 or one of the radicals can combine with O2 to form O3
1. photodissociation of O2 to produce two Oxygen radicals.…read more

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Homogeneous Catalysts:
energy to overcome this lower energy barrier and rate is faster.
enthalpy.…read more

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· Green house gasses
· highly flammable
Disadvantages....…read more

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Higher concentrations of products than reactants then the equilibria lies on the Right Hand Side
Higher concentrations of reactiants than products the equilibria lies on the Left Hand Side of the
Positions of the equilibria
of the reverse.
Chemical Equilibria are always dynamic because the rate of the forward reaction equals the rate
do not change.
A chemical equilibrium is a state of balance in which the concentration of reactants and products
Reversible reactions can reach a state of dynamic equilibrium.…read more

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Le Chatelier's Principle
Le Chatelier's Principle- "If a system is at equilibrium, and a change is made in any of the
conditions, then the system responds to counteract the change as much as possible.
Increasing pressure shifts the equilibrium to the side with the less gas molecules as this tends to
reduce the pressure
Decreasing the pressure shifts the equilibrium to the side with more gas molecule as this tends
to increase the pressure.…read more


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