OCR Chemistry A F321 Definitions 0.0 / 5 ? ChemistryASOCR Created by: Adam SellersCreated on: 09-01-13 18:46 Atoms of the same element with a different number of neutrons. Isotopes 1 of 26 The weighted mean mass of an atom of an element when compared with 1/12th the mass of a carbon-12 atom. Relative Atomic Mass 2 of 26 The weighted mean mass of an atom of an isotope compared with 1/12th the mass of a carbon-12 atom. Relative Isotopic Mass 3 of 26 The quantity whose unit is the mole. It is a measure of the number of atoms within a molecule. Amount of Substance 4 of 26 The unit for "amount of substance" Mole 5 of 26 6.022X10(23) Avogadros Constant 6 of 26 The mass per mole of substance, units of gmol-1. Molar Mass 7 of 26 The simpliest whole number ratio of atoms in a compound. Empirical Formula 8 of 26 The actual number of atoms of each element present in a compound. Molecular formula 9 of 26 A large amount of solute dissolved in water (description of concentration) Concentrated 10 of 26 Something produced when the H+ ion of an acid is replaced by a postive ion, like a metal ion or ammonium. Salt 11 of 26 A substance that contains no water molecules. Anhydrous 12 of 26 A crystalline compound containing water molecules. Hydrated 13 of 26 Water molecules that form an essential part in the crystalline structure of a compound. Water of Crystallisation 14 of 26 The loss of electrons and increase in oxidation number. Oxidation 15 of 26 The gaining of electrons and decrease in oxidation number. Reduction 16 of 26 The energy required to remove one electron from each atom in one mole of gaseous atoms to form one mole of gaseous 1+ ions. First Ionisation Energy 17 of 26 A measure of the energy required to remove each eletron in turn. Successive Ionisation Energy 18 of 26 A region within an atom that can hold up to two electrons with opposite spins. Orbital 19 of 26 The electrostatic attraction between positive metal ions and delocalised electrons. (...bonding) Metallic 20 of 26 The electrostatic attraction between oppositely charged ions. (...bonding) Ionic 21 of 26 A shared pair of electrons. (...bonding) Covalent 22 of 26 A covalent bond where both of the bonded electrons have been donated by one of the bonded atoms. Dative Covalent Bond 23 of 26 The ability of an atom to attract the bonded pair of electrons in a covalent bond. Electronegativity. 24 of 26 Repeating pattern of trends across a period. Periodicity 25 of 26 A reaction in which an element is both oxidised and reduced. Disproportionation 26 of 26
Comments
Report