OCR A LEVEL CHEMISTRY DEFINITIONS EXAM [ALREADY GRADED A+] WITH CORRECT DETAILED

OCR A LEVEL CHEMISTRY DEFINITIONS EXAM [ALREADY GRADED A+] WITH CORRECT DETAILED Amphoteric chemicals - ANSWER-Chemicals that can react with both acids and bases Anion - ANSWER-A negatively charged ion Anhydrous - ANSWER-A substance that contains no water molecules Arrhenius plot - ANSWER-A graph of lnK = lnA - Ea/R x 1/T Atomic Orbital - ANSWER-A region of space where you will likely find electrons. Each orbital can hold 2 electrons, with opposite spins Atomic number - ANSWER-The number of protons in the nucleus of an atom Average bond enthalpy - ANSWER-The mean energy needed for 1 mole of a given type of gaseous bonds to undergo homolytic fission Avogadro constant - ANSWER-The number of atoms per mole of the carbon-12 isotope (6.02x10^23) Base - ANSWER-A chemical that will react with an acid Activation Energy - ANSWER-The minimum energy required to start a reaction by breaking bonds in the reactants Addition Polymer - ANSWER-A very long molecular chain formed by repeated addition reactions of many unsaturated alkene molecules Addition Reaction - ANSWER-A reaction in which a reactant is added to an unsaturated molecule to make a saturated molecule Acid Dissociation Constant - ANSWER-Ka= [H+(aq)][A-(aq)]/[HA(aq)] Aliphatic Hydrocarbon - ANSWER-A hydrocarbon where carbon atoms are joined together in straight or branched chains Alkali - ANSWER-A base that dissolves in water forming OH- ions Alkanes - ANSWER-The homologous series with general formula CnH2n+2 Alkylammonium salt - ANSWER-A compound where the hydrogen's on an ammonium ion have been substituted by alkyl chains