Unit 1 part 2 rates of reactions

Unit 1 part 2 rates of reactions - AcTvated complex an...

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Rate of reaction: speed at which a chemical change occurs expressed as change in concentration perunit time Inst rate of change: speed at which a reaction is proceeding at particular point Average rate of change: speed at which a reaction proceeds over a period of time Catalyst: a substance that aids in a reaction but is not used up Enzyme: protein in living cells that control rate of biochemical reactions Rate law equation: the relationship among rate, the rate constant, and the initial concentrations of reactants and the orders of reaction with respect to the reactants also called rate equation or rate law Rate constant: proportional constant in the rate law equation Order of reaction: the exponent value that describes the initial concentration dependence of a particular reactant Overall order of reaction: sum of the exponents in the rate law equation Half-life: time for half of a nuclei in a radioactive sample to decay or for half the amount of the reactant to be used up Activation energy: the minimum increase in potential of a system required for molecules to react
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Unformatted text preview: AcTvated complex: an unstable chemical species containing parTally broken and parTally formed bonds represenTng the max potenTal energy point in the change Elementary step: step in a reacTon mechanism that only involves one, two or three parTcles colliding ReacTon mechanism: a series of elementary steps that make up an overall reacTon Rate determining step: slowest step in a reacTon mechanism ReacTon intermediates: molecules formed as short lived products in reacTon mechanisms ±hreshold energy: the minimum kineTc energy required to convert kineTc energy to acTvaTon energy during the formaTon of the acTvated complex Heterogeneous catalyst: catalyst in a reacTon in which the reactants and the catalyst are in diFerent physical states Homogenous catalyst: catalyst in a reacTon in which the reactants and the catalyst are in the same physical state...
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