Chemistry: Unit 1 Module 1 0.0 / 5 ? ChemistryReactionsASOCR Created by: Megan FoxenCreated on: 21-02-14 14:59 Isotopes Atoms of the same element with different numbers of neutrons 1 of 29 Atomic Number The number of protons in the nucleus 2 of 29 Mass Number The number of protons and neutrons in the nucleus 3 of 29 Ion A positively or negatively charged atom or groups of atoms 4 of 29 Relative Isotopic Mass The mass of an atom of an isotope compared with one-twelfth of the mass of an atom of Carbon-12 5 of 29 Relative Atomic Mass The weighted mean mass of an atom of an element compared with one-twelfth of the mas of an atom if Carbon-12 6 of 29 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 29 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 29 Avogadro Constant The number of atoms per mole of the Carbon-12 isotope 9 of 29 Molar Mass The mass per mole of a substance (g mol-1) 10 of 29 Empirical Formula The simplest whole-number ratio of atoms of each element present in a compound 11 of 29 Molecular Formula The actual number of each element in a molecule 12 of 29 Concentration The amount of solute in mol, dissolved per 1 dm3 of solution 13 of 29 Species Any type of particle that takes place in a chemical reaction 14 of 29 Stoichiometry The molar relationship between the relative quantities of substances taking part in a reaction 15 of 29 Acid A species that is a proton donor 16 of 29 Base A species that is a proton acceptor 17 of 29 Alkali A type of base that dissolves in water forming Hydroxide ions 18 of 29 Salt Any chemical compound formed from an acid when a H+ ion from the acid has been replaced by a metal ion or another positive ion 19 of 29 Cation A positively charged ion 20 of 29 Anion A negatively charged ion 21 of 29 Oxidation The loss of electrons or an increase in oxidation number 22 of 29 Reduction The gain of electrons or a decrease in oxidation number 23 of 29 Redox Reaction A reaction in which both reduction and oxidation take place 24 of 29 Reducing Agent A reagent that reduces (adds electrons to) another species 25 of 29 Oxidising Agent A reagent that oxidises (takes electrons from) another species 26 of 29 Hydrated Refers to a crystalline compound containing water molecules 27 of 29 Anhydrous Refers to a crystalline compound that contains no water molecules 28 of 29 Water of Crystallisation Water molecules that form an essential part of the crystalline structure of a compound 29 of 29
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