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OCR A2 flashcards
8
Chemistry
12th Grade
02/24/2014

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Term
Half-life
Definition
The time taken for the concentration of a reactant to reduce by half.
Term
Order
Definition
The power to which the concentration of the reactant is raised in the rate equation.
Term
Overall order
Definition
The sum of the individual orders: m + n.
Term
Rate constant, k
Definition
The constant that links the rate of reaction with the concentrations of the reactants raised to the powers of their orders in the rate equation.
Term
Rate equation
Definition
For a reaction: A + B → C, the rate equation is given by:
Term
Rate of reaction
Definition
The change in concentration of a reactant or a product in a given time.
Term
Rate-determining step
Definition
The slowest step in the reaction mechanism of a multi-step reaction.
Term
Stoichiometry
Definition
The molar relationship between the relative quantities of substances taking part in a reaction.
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