Chemistry A2- keywords Unit 2 0.0 / 5 ? ChemistryEnthalpyRatesEnergeticsEntropyEquilibriaA2/A-levelOCR Created by: Fi WilCreated on: 21-01-14 22:22 Rate of reaction The change in concentration in product or reactant over time 1 of 11 Order With respect to a reactant is the power to which the concentration of the reactant is raised in the rate equation 2 of 11 Rate constant, K The constant that links the rate of react with the con of the reactants raised to the powers of their orders in the rate equation 3 of 11 Half-life The time taken for the concentration of the reactant to reduce by half 4 of 11 multi-step reaction The slowest step in a multi-step reaction mechanism of a multi-step reaction 5 of 11 dynamic equilibrium Exists in a closed system when the rate of the forward reaction is equal to the rate of the reverse reaction 6 of 11 Acid-base pair A pair of 2 species that transform into eachother by gaining or losing H+ 7 of 11 buffer solution A mixture that minimises pH changes on addition of small amounts of acid or base 8 of 11 standard enthalpy change of neutralisation The energy change that accompanies acid neutralisation of an aqeous acid by an aqeous base to form one mole of H20 under standard con 9 of 11 Equivalence point The point at which the volume of one solution has reacted exactly with the volume of the second solution 10 of 11 End point Is the point at which there are equal conc of the weak acid and conjugate base forms of the indicator 11 of 11
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