Chemistry Definitions 0.0 / 5 ? ChemistryDefinitionsASOCR Created by: amyspry1Created on: 11-04-14 16:12 Relative Isotopic Mass The mass of an atom of an isotope compared with 1/12th of the mass of an atom of Carbon-12. 1 of 23 Relative Atomic Mass The weighted mean mass of an element compared with 1/12th of the mass of an atom of Carbon-12. 2 of 23 Relative Molecular Mass The weighted mean mass of a molecule compared with 1/12th of the mass of an atom of Carbon-12. 3 of 23 Relative Formula Mass The weighted mean mass of a formula compared with 1/12th of the mass of an atom of Carbon-12. 4 of 23 Empirical Formula The simplest whole number ratio of atoms of each element present in a compound. 5 of 23 Molecular Formula The actual number of atoms of each element in a molecule. 6 of 23 First Ionisation Energy The energy required to remove one electron from each atom in one mole of gaseous atoms to form one mole of gaseous 1+ ions. 7 of 23 Second Ionisation Energy The energy required to remove one electron from each ion in one mole of gaseous 1+ ions to form one mole of gaseous 2+ ions. 8 of 23 Acid A species that is a proton donor. 9 of 23 Base A species that is a proton acceptor. 10 of 23 Alkali A type of base that dissolves in water forming hydroxide ions (OH-). 11 of 23 Salt Any chemical compound formed from an acid when a H+ ion from the acid has been replaced by a metal ion or another positive ion. 12 of 23 Cation A positively charged ion. 13 of 23 Anion A negatively charged ion. 14 of 23 Anhydrous A substance that contains no water molecules. 15 of 23 Water of Crystallisation Water molecules that form an essential part of the crystalline structure of a compound. 16 of 23 Oxidation Number The number of electrons that an atom uses to bond with atoms of another element. 17 of 23 Oxidation A loss of electrons. 18 of 23 Reduction A gain in electrons. 19 of 23 Redox Reaction A reaction in which both reduction and oxidation takes place. 20 of 23 Reducing Agent A reagent that reduces another species. 21 of 23 Oxidising Agent A reagent that oxidises another species. 22 of 23 Disproportion Reaction The oxidation and reduction of the same element in a redox reaction. 23 of 23
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