Module 1 F321 definitions 0.0 / 5 ? ChemistryAcids, bases and saltsCalculationsASOCR Created by: Amy McCreated on: 20-02-15 17:08 Isotopes Atoms of the same element with different numbers of neutrons 1 of 34 Atomic number The number of protons in the nucleus of an atom 2 of 34 Mass number The number of particles in the nucleus 3 of 34 Ion A positively or negatively charged atom or group of atoms 4 of 34 Relative isotopic mass The mass of an atom of an isotope compared with 1/12 of the mass of an atom of C-12 5 of 34 Relative atomic mass The weighted mean mass of an atom of an element compared with 1/12 of the mass of an atom of C-12 6 of 34 Relative molecular mass The weighted mean mass of a molecule compared with 1/12 of the mass of an atom of C-12 7 of 34 Relative formula mass The weighted mean mass of a formula unit compared with 1/12 of the mass of an atom of C-12 8 of 34 Avogadro constant The number of atoms per mole of the C-12 isotope 9 of 34 Mole The amount of any substance containing as many particles as there are carbon atoms in exactly 12g of the C-12 isotope 10 of 34 Molar mass The mass per mole of a substance 11 of 34 Empirical formula The simplest whole number ratio of atoms of each element present in a compound 12 of 34 Molecule A small group of atoms held together by covalent bonds 13 of 34 Molecular formula The actual number of atoms of each element in a molecule 14 of 34 Molar volume The volume per mole of a gas 15 of 34 Concentration The amount of solute, in mol, dissolved per 1dm3 of solution 16 of 34 Standard solution A solution of known concentration 17 of 34 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 Acid A species that is a proton donor 20 of 34 Base A species that is a proton acceptor 21 of 34 Alkali A type of base that is soluble in water, and dissolves to form hydroxide ions 22 of 34 Salt Any chemical compound formed from an acid when a H+ ion from the acid has been replaced by a metal ion or another cation 23 of 34 Cation A positively charged ion 24 of 34 Anion A negatively charged ion 25 of 34 Hydrated Refers to a crystalline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 that contains no water molecules 27 of 34 Water of crystallisation Water molecules that form an essential pat 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 atoms of another element 29 of 34 Oxidation Loss of electrons / increase in oxidation number 30 of 34 Reduction Gain of electrons / decrease in oxidation number 31 of 34 Redox reaction A reaction in which both reduction and oxidation take place 32 of 34 Reducing agent A reagent that reduces another species 33 of 34 Oxidation agent A reagent that oxidises another species 34 of 34
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