Chemistry Terms- A21 with verified definitions(latest update)|GUARANTEED SUCCESS

Lattice enthalpy The enthalpy change when one mole of an ionic compound is converted to gaseous ions. Enthalpy of atomisation The enthalpy change when one mole of gaseous atoms is formed from the element in its standard state Previous Play Next Rewind 10 seconds Move forward 10 seconds Unmute 0:00 / 0:15 Full screen Brainpower Read More First electron affinity The enthalpy change when one mole of gaseous atoms is converted into gaseous ions with a single negative charge. enthalpy of solution The enthalpy change when one mole of a solid ionic substance is dissolved in enough water Enthalpy of hydration The enthalpy change when one mole of gaseous ions is converted to one mole of aqueous ions. feasible a reaction for which deltaG0 Entropy A measure of disorder or randomness. rate of reaction the change in concentration of a reactant or product per unit time Order of reaction with respect to a reactant The power to which the concentration of a reactant is raised in the rate equation order of reaction overall The sum of the powers to which the concentration terms are raised in the rate equation rate constant The proportionality constant which links the rate of the reaction to the concentrations in the rate equation. rate determining step the slowest step in a reaction mechanism Bronsted acid proton donor Bronsted base proton acceptor buffer solution A solution which resists changes in pH on addition of small amounts of acid or alkali. Monobasic acid Donates one proton per molecule. asymmetric center an atom bonded to four different atoms or groups optical isomers Molecules which exist as non-superimposable mirror images. optically active A sample which rotates the plane of plane polarised light. racemic mixture A 50:50 mixture of two optical isomers monoester An ester which contains only one ester group. transesterification A reaction where the alkyl group of an ester is exchanged with the alkyl group of an alcohol. Biodiesel a fuel, similar to diesel, which is made from vegetable sources Delocalisation (arenes) The π electrons are spread over several atoms.