Atoms and reactions 0.0 / 5 ? ChemistryReactionsA2/A-levelOCR Created by: Kat098Created on: 03-04-18 18:31 Isotope Atom of the same proton number but different neutron number 1 of 34 Atomic number Number of protons in the nucleus of an atom 2 of 34 Mass Number Number of protons and neutrons in a nucleus 3 of 34 Ion A positively/negatively charged atom 4 of 34 Relative isotopic mass Mass of an atom of an isotope compared to 1/12th of the mass of an atom of carbon-12 5 of 34 Relative atomic mass Weighted mean mass of an atom of an element compared to 1/12th of the mass of an atom of carbon-12 6 of 34 Relative molecular mass Weighted mean mass of a molecule compared to 1/12th of the mass of an atom of carbon-12 7 of 34 Relative formula mass weighted mean mass of a formula unit comapred to 1/12th of the mass of an atom of carbon-12 8 of 34 Avogadro Constant Number of atoms per mole of the carbon-12 isotpe (6.02x10^23mol^-1) 9 of 34 Mole Amount of any substance containing as many particles as there are carbon atoms in exactly 12g of carbon-12 10 of 34 Molar mass Mass per mole of a substance 11 of 34 Molar gas volume Volume per mole of a gas 12 of 34 Concentration Amount of solute, in mol, dissolved per 1dm^3 of solution 13 of 34 Standard solution A solution with a known concentration 14 of 34 Concentrated A large amount of solute per dm^3 15 of 34 Species Type of particle that takes part in chemical reactions 16 of 34 Stoichiometry Molar relationship between relative quantities of substances taking part in a reaction 17 of 34 Percentage yiled actual amount, in mol, of product / theoretical amount 18 of 34 Atom economy mass of desired product / mass of all products 19 of 34 Acid Species that is a proton donator and release H+ ions 20 of 34 Base Species that is a proton acceptor (OH-) 21 of 34 Alkali Type of base dissolved in water forming OH- ions 22 of 34 Salt Ant chemical compound formed when the H+ in an acid is replaced by a metal ion 23 of 34 Cation Postiviely charged ion 24 of 34 Amphoteric substances Substances that can react as both acids and bases 25 of 34 Water of crystallisation water moleucles that form an essential part of the crystalline structure of a compound 26 of 34 Anhydrous A substance that contains no water molecules 27 of 34 Oxidation number Number of electrons an atom uses to bond with atoms of another element 28 of 34 Oxidation Loss of electrons (increase in oxidation number) 29 of 34 Reduction Gain of electrons (decrease in oxidation number) 30 of 34 Redox reaction Reaction that has both oxidation and reduction taking place 31 of 34 Reducing agent Reagent that reduces (adds electrons to) another species 32 of 34 Oxidising agent Reagent that oxidises (takes electrons from) another species 33 of 34 Atomic structure Positively charged nucleus supprounded by negatively charged electrons, revolving in orbits art varying distances from the nucleus 34 of 34
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