F321 Definitions 0.0 / 5 ? ChemistryASEdexcel Created by: Luke CCreated on: 15-05-13 12:05 Isotopes Atoms of the same element with different numbers of neutrons 1 of 35 Atomic number The number of protons in the nucleus of an atom 2 of 35 Mass number The number of protons and neutrons in an atom 3 of 35 Ion A positivley or negativley charged atom or molecule 4 of 35 Relative isotopic mass The mass of an atom of an isotope compared with 1/12th of the mass of an atom of carbon-12 5 of 35 Relative Atomic Mass The weighted mean mass of an atom of an element compared with 1/12th of the mass of an atom of carbon-12 6 of 35 Relative molecular mass The weighted mean mass of a molecule compared with 1/12th of an atom of carbon-12 7 of 35 Relative formula mass The weighted mean mass of a formula unit compared to 1/12th of the mass of an atom of carbon-12 8 of 35 Amount of substance The quantity whose units is the mole 9 of 35 Avogadro Constant The number of atoms per mole of carbon-12 (6.02x10^23) 10 of 35 A mole The amount of substance containing as many particles as there are carbon-12 atoms in 12g of carbon-12 11 of 35 Molar mass The mass per mole of substance. The units of molar mass are g mol^-1 12 of 35 Empirical formula The simplest whole number ratio of atoms of each element present in a compound 13 of 35 Molecule A small group of atoms held together by covalent bonds 14 of 35 Molecular formula Actual number of atoms of each element in a molecule 15 of 35 Molar volume The volume per mole of gas. At RTP this is 24.0 dm^3 16 of 35 Concentration The amount of solute in moles dissolved per dm^3 of solution 17 of 35 Standard solution A solution of known concentration 18 of 35 Species Any particle that takes part in a chemical reaction 19 of 35 Stoichiometry The molar relationship between the relative quantities of substances taking part in a reaction 20 of 35 Acid A species that is a proton donor 21 of 35 Base A species that is a proton acceptor 22 of 35 Alkali A base that dissolves in water forming hydroxide ions (OH-) 23 of 35 Salt A compound formed from an acid when the H+ of an acid is replaced by a metal ion or other positivley charged ions 24 of 35 Cation A positively charged ion 25 of 35 Anion A negatively charged ion 26 of 35 Hydrated A crystalline compound containing water molecules 27 of 35 Anhydrous A compound containing no water molecules 28 of 35 Water of crystallisation Water that forms the essential part of the crystalline structure of a compound 29 of 35 Oxidation number A measure of the number of electrons that an atom uses to bond with atoms of another element 30 of 35 Oxidation A loss of electrons and an increase in oxidation number 31 of 35 Reduction Gain of electrons and a decrease in oxidation number 32 of 35 Reducing agent A reagent that reduces another species 33 of 35 Oxidising agent A reagent that oxidises another species 34 of 35 Redox reaction A reaction in which both oxidation and reduction take place 35 of 35
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