1.1 Definitions The difinitions you need to leanr for 1.1 atoms and reactions. 3.0 / 5 based on 2 ratings ? ChemistryBonding & shapesASOCR Created by: KellyCreated on: 10-12-12 18:57 Isotopes Atoms of the same element with diferent numbers of neutrons 1 of 22 Ion Positively or negativly charged atom 2 of 22 Molecular ion A positive or negatively charaged group of covalently bonded atoms. 3 of 22 Relative isotopic mass Mass of an atom compared with one-twelth of the mass of an atom of carbon-12 4 of 22 Relative Atomic mass Weighted mean mass of an atom of an element compared with one twelth of the mass of an atom of carbon-12 5 of 22 Relative molecular mass Weighted mean mass of a molecule compared with one-twelth of the mass of an atom of carbon-12 6 of 22 Relative formula mass Weighted mean mass of a formula unit compared with one-twekth of the mass of an atom of carbon-12 7 of 22 Avogadro's constant Number of atoms per mole of carbon-12 isotope 8 of 22 Mole The amount of any substance containing as many particles as there are carbon atoms in exactly 12g of the carbon-12 isotope. 9 of 22 Molar mass Mass per mole of a substance 10 of 22 Empirical formula Simplest whole number ratio of atoms of each element present in a compund 11 of 22 Molecule Small group of atoms held together by covalent bonds 12 of 22 Molecular formula Actual number of atoms of each element in a molecule 13 of 22 Molar volume Volume of mole of a gas 14 of 22 Concentration Amount of solute, in mol dissolved per 1dm3 of solution 15 of 22 Stoichiometry Molar relationship netween the relative quantities of substances taking part in a reaction 16 of 22 Acid A species that is a proton donor 17 of 22 Base A species that is a proton acceptor 18 of 22 Salt A chemical compound formed from an acid when a H+ ion from the acid has been replaced by a metal ion or another positive ion. 19 of 22 Oxidisation number Measure of the number of electrons that an atom uses to bond with atoms of another element 20 of 22 Reducing agent A reagent that reduces (adds electrons to) another species 21 of 22 Oxidising agent A reagent that oxidises (takes electrons from) another species 22 of 22
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