The Atmosphere key words

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Collision theory
States that particles of reactants collide with a certain minimum kinetic energy
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Enthalpy profiile
A diagram to show how the enthalpy changes as a reaction proceeds
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Activation enthalpy (Ea)
The minimum kinetic energy required by a pair of colliding particles before a reaction will occur. The energy that must be supplied to enable the bonds in the reactants to stretch and break as new bonds form in the product.
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Dynamic equillibrium
When the rate of forward reaction is equal to the rate of backwards reaction; the rate of reactants being converted into products is equal to rate of products being converted into reactants
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Le Chatlier's principle
States that if a system is at equilibrium and a change is made in any of the conditions, then the system responds to counteract that change as much as possible
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Greenhouse effect
The process in which the absorption and subsequent emission of infra-red radiation by atmospheric gases warms up the lower atmosphere and the planets surface
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Homogeneous catalyst
A catalyst in a different physical state to the reactants that works by forming intermediate compounds with the reactants
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Radicals
A species with one or more unpaired electrons
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Heterolytic fission
Both the electrons in the shared pair go to just one of the atoms when the bond breaks, forming Ions
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Homolytic fisson
One of the two electrons in the shared pair goes to each of the atoms, leaving both the atoms with an unpaired electron, forming radicals
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Photodissociation
When molecules absorb ultra violet radiation at the right frequency to split the molecule apart
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Other cards in this set

Card 2

Front

A diagram to show how the enthalpy changes as a reaction proceeds

Back

Enthalpy profiile

Card 3

Front

The minimum kinetic energy required by a pair of colliding particles before a reaction will occur. The energy that must be supplied to enable the bonds in the reactants to stretch and break as new bonds form in the product.

Back

Preview of the back of card 3

Card 4

Front

When the rate of forward reaction is equal to the rate of backwards reaction; the rate of reactants being converted into products is equal to rate of products being converted into reactants

Back

Preview of the back of card 4

Card 5

Front

States that if a system is at equilibrium and a change is made in any of the conditions, then the system responds to counteract that change as much as possible

Back

Preview of the back of card 5
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