AQA A2 chemistry unit 4 definitions It's the definitions for chem 4 AQA. 0.0 / 5 ? ChemistryAllA2/A-levelAQA Created by: the.dinosaur.councilCreated on: 06-04-16 16:25 Rate of reaction change in concentration of reactants or products in a given time (units are mol dm-3 s-1) 1 of 26 Order of reaction power of reactant’s concentration in the rate equation 2 of 26 Overall order of reaction sum of powers of concentration terms in rate equation 3 of 26 Rate constant the constant of proportionality, k, in the rate equation 4 of 26 Homogeneous system all reactants and products are in the same phase 5 of 26 Heterogeneous system reactants and products are not all in the same phase 6 of 26 Bronsted-Lowry acid proton donor 7 of 26 Bronsted-Lowry base proton acceptor 8 of 26 Strong acid or base fully dissociated in water 9 of 26 Weak acid or base partially dissociated in water 10 of 26 pH pH = -log10[H+] 11 of 26 [H+] 10^-pH 12 of 26 kw (ionic product of water) Kw = [H+][OH-] 13 of 26 ka Ka = [H+][A-] / [HA] 14 of 26 pka pKa = -log[Ka] 15 of 26 Buffer solution resists changes in pH when small amount of acid or base is added 16 of 26 Equivalence Point in a titration where moles of acid equals moles of base 17 of 26 Conjugate acid-base pairs Two species differing by H+ 18 of 26 Zwitter ion an ion, typically found in amino acids, that has both a positive and a negative charge 19 of 26 Condensation ionisation reaction between two different types of molecule to give a polymer accompanied by the loss of a small molecule such as water 20 of 26 Stereoisomerism Compounds with the same structural formula but different arrangements of atoms in space 21 of 26 Chiral centre carbon atom bonded to four different atoms or groups of atoms 22 of 26 Optical isomerism isomerism arising from molecules being chiral i.e. being non-superimposable mirror images 23 of 26 Optical activity ability of chiral molecules to rotate plane-polarised light 24 of 26 Enantiomer an optical isomer 25 of 26 Racemate equal mixture of enantiomers that is optically inactive 26 of 26
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