F321, Module1 - Key Definitions 0.0 / 5 ? ChemistryAcids, bases and saltsReactionsRedoxASOCR Created by: Charlotte9Created on: 20-05-14 21:14 Isotopes Atoms of the same element with different numbers of Neutrons 1 of 34 Atomic(proton) number The number of protons in the nucleas of an atom 2 of 34 Mass (nucleon) Number The number of particles (protons and neutrons) in the nucleas of an atom 3 of 34 An ion A positively or negatively charged atom or (covalently bonded) group of atoms (a molecular ion) 4 of 34 Relative isotopic mass The massnof an atom of an isotope compared with one twelfth of the mass of an atom of Carbon-12 5 of 34 Relative atomic mass The weighted mean mass of an atom of an element compared with one twelfth of the mass of an atom of Carbon-12 6 of 34 Relative molecular mass The weighted mean mass of a molecule compared with one twelfth of the mass of an atom of Carbon-12 7 of 34 Relative formula mass The weighted mean mass of a formula unit compared with one twelfth of the mass of an atom of Carbon-12 8 of 34 Amount of substance The quantity whose unit is the mole. Chemists use 'amount of substance' as a means of counting atoms 9 of 34 The Avogadro Constant, Na The number of atoms per mole of the Carbon-12 isotope (6.02 * 10^-3) 10 of 34 A mole The amount of any substance containing as many particles as the are carbon atoms in exactly 12g of the Carbon-12 isotope 11 of 34 Molar mass, Mr The mass per mole of a substance 12 of 34 Empirical formula The simplest whole-number ratio of atoms of each element present in a compound 13 of 34 A molecule A small group of atoms held together by covalent bonds 14 of 34 The molecular formula The actual number of atoms of each element in a molecule 15 of 34 Molar volume The volume per mole of a gas 16 of 34 Concentration The amount of a solute, in mol, dissolved per 1dm^3 (1000cm^3) of solution 17 of 34 A species Any type of particle that takes place in a chemical reaction 18 of 34 Stoichiometry The molar relationship between the relative quantities of substances taking part in a reaction 19 of 34 An acid A proton donor 20 of 34 A base A proton accecptor 21 of 34 An alkali A type of base that dissolves in water forming hydroxide ions, OH- 22 of 34 A salt Any chemical compound formed from an acid when a H+ ion from the acid has been replaced by a metal ion or another positive ion 23 of 34 A cation A positively charged ion 24 of 34 An anion A negatively charged ion 25 of 34 Hydrated Refers to a crystalline compound containing water molecules 26 of 34 Anhydrous Refers to a substance the contains no water molecules 27 of 34 Water of crystallisation Refers to water molecules the form an essential part of the crystalline structure of a compound 28 of 34 Oxidation number A measure of the number of electrons that an atom uses to bond with an atom of another element 29 of 34 Oxidation Loss of electrons 30 of 34 Reduction Gain of electrons 31 of 34 A redox reaction A reaction in which both reduction and oxidation both take place 32 of 34 A reducing agent A reagent which reduces another species 33 of 34 An oxidising agent A reagent which oxidises another species 34 of 34
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