070908 - Factors Affecting the Rate of a Reaction Reactant...

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Factors Affecting the Rate of a Reaction y Reactant Concentrations – y Stoichiometry of Elementary Steps – y Temperature – y Molecular Orientation –
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Collision Model y Molecules must collide to react. y Only a small fraction of collisions produces a reaction. y Activation Energy – y Activated Complex –
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Collision Model
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Molecular Orientations
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Rate Constant
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Arrhenius Equation Svante Arrhenius 1859 – 1927 Swedish Chemist Noble Prize 1903
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Arrhenius Equation y Rate constants for the reaction: { NO 2(g) + CO (g) Æ NO (g) +CO 2(g) y are 1.3 M -1 s -1 at a temperature of 700 K and 23.0 M -1 s -1 at 800K. y What is the activation energy on kJ/mol?
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Arrhenius Equation y What is the rate constant at 750 K?
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Catalysis y Catalyst – y Homogeneous Catalyst – y Heterogeneous Catalyst – y Adsorption – y Absorption –
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Catalysis y In the upper atmosphere, chlorofluorocarbons such as CFCl 3 absorb sunlight, and subsequent fragmentation produces Cl atoms. The Cl atoms participate in the following mechanism for the destruction of ozone:
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070908 - Factors Affecting the Rate of a Reaction Reactant...

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