Chapter 1 definitions 0.0 / 5 ? ChemistryA2/A-levelEdexcel Created by: CatCreated on: 26-02-13 20:10 Measures the rate of formation of a product or rate of removal of a reactant. It is the change in measured property divided by time. Rate of reaction 1 of 14 Writing in these is the shorthand for concentration moldm-3. Square brackets 2 of 14 An expression to show the relationship between concentrations of reactions, the rate constant and the rate. Rate equation 3 of 14 k, which is dependent on activation energy and temperature, and is a proportionality constant for a given equation Rate constant 4 of 14 A number that relates the rate of a chemical reaction with the concentration of the reacting substances Order of reaction 5 of 14 The time for the concentration of one of the reactants to fall by half Half-life 6 of 14 The state of reacting atoms, molecules or ions when they are at the top of the activation energy barrier for a reaction step Transition state 7 of 14 The plot that shows how the total energy of the atoms, molecules or ions changes during the progress of a change from reactants to products Reaction profile 8 of 14 The state if matter, gas solid or liquid, of a compound Phase 9 of 14 A catalyst in the same phase as the reactants homogenous catalyst 10 of 14 A catalyst which is in a different phase to the reactants heterogenous catalyst 11 of 14 The slowest step in a multi-step reaction, and the step with the highest activation energy Rate-determining step 12 of 14 A nucleophilic reaction with a mechanism that involves only one molecule or ion in the rate-determining step Sn1 reaction 13 of 14 A nucleophilic substitution reaction with a mechanism that involves two or more molecules or ions in the rate-determining step Sn2 reaction 14 of 14
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