OCR Chemistry F321 Module 1 Definitions 0.0 / 5 ? ChemistryASOCR Created by: Kate WestallCreated on: 21-05-13 19:46 Empirical formula The simplest whole-number ratio of atoms of each element in a compound 1 of 32 Molar volume The volume per mole of a gas. At RTP the molar volume is approximately 24.0 dm^3 mol^-1 2 of 32 Relative isotopic mass The mass of an atom of an isotope compared to one-twelfth the mass on atom of Carbon-12. 3 of 32 Mole The amount of any substance containing as many particles as there are Carbon atoms in exactly 12g of the Carbon-12 isotope 4 of 32 Molecule A small group of atoms held together by covalent bonds 5 of 32 Amount of substance The quantity whose unit is a mole. Used by chemists as a means of counting atoms 6 of 32 Ion A positively or negatively charged atom or group of atoms 7 of 32 Standard solution A solution of known concentration. Normally used in titrations to determine unknown information about another substance 8 of 32 Concentration of a solution The amount of solute, in mol, dissolved per 1dm^3 of a solution 9 of 32 Relative formula mass The weighted mean mass of a formula unit compared to one twelfth the mass of an atom of Carbon-12 10 of 32 Relative molecular mass The weighted mean mass of a molecule compared to one twelfth the mass of an atom of Carbon-12 11 of 32 Isotopes Atoms of the same element with a different number of neutrons 12 of 32 Molecular formula The actual number of atoms of each element in a molecule 13 of 32 Relative atomic mass The weighted mean mass of an atom of an element compared to one twelfth the mass of an atom of Carbon-12 14 of 32 Avagadro's constant The number of atoms per mole of the Carbon-12 isotope, 6.02x10^23 15 of 32 Molar mass The mass per mole of a substance, gmol^-1 16 of 32 Species Any type of particle that takes place in a chemical reaction 17 of 32 Acid A species that is a proton donor 18 of 32 Base A species that is a proton acceptor 19 of 32 Alkali A type of base that dissolves in water forming hydroxide ons 20 of 32 Salt A chemical compound formed from an acid when a H+ ion from the acid has been replaced by a metal ion or another positive ion 21 of 32 Cation A positively charged ion 22 of 32 Anion A negtively charged ion 23 of 32 Hydrated A crystalline compound containing water molecules 24 of 32 Anhydrous A substance that contains no water molecules 25 of 32 Water of crystallisation Water molecules that form an essential part of the crystalline structure of a compound 26 of 32 Oxidation number A measure of the number of electrons that an atom uses to bond with atoms of another element. Oxidation numbers are derived from a set of rules 27 of 32 Oxidation The loss of electrons or an increase in oxidation number 28 of 32 Reduction The gain of electrons or decrease in oxidation number 29 of 32 Redox reaction A reaction in which both oxidation and reduction take place 30 of 32 Reducing agent A readant that reduces (adds electrons to) another species 31 of 32 Oxidising agent A reagent that oxidises (takes electrons from) another species 32 of 32
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