Chemistry revision 0.0 / 5 ? ChemistryKeywordsASAQA Created by: ShaneishCreated on: 06-10-13 20:43 Atomic number Number of protons 1 of 15 Mass number Number of protons plus neutrons 2 of 15 Relative isotopic mass Mass of an individual isotopes relative to the mass of Carbon-12 3 of 15 Relative atomic mass Average mass of an elements isotopes relative to the mass of Carbon-12.Where Carbon-12 has a mass of 12 4 of 15 First ionisation energy The energy required to remove one electron from each atom in one mole of gaseous atom to form gaseous 1+ ions 5 of 15 Isotopes Atoms with the SAME number of protons but DIFFERENT numbers of neutrons 6 of 15 Avogrado's number Number of atoms in 12g of Carbon-12 7 of 15 Avogrado's Law At a constant temperature and pressure the volume of one mole of any gas is the same 8 of 15 Ideal gas equation PV=nRT (R=8.31 JK mol ) 9 of 15 Empirical formula The simplest whole number ratio in which the atoms in a compound combine together 10 of 15 Molecular formula A formula that tells us the number of atoms each 11 of 15 Dative covalent bond (coordinate) A covalent bond formed when both shared electrons are provided by only one atom. The donor atom must have a lone pair. 12 of 15 Electronegativity The measure of an atoms tendency to attract the electron pairs from a covalent bond 13 of 15 Inter molecular forces (IMF) These are weak electrostatic forces of attraction BETWEEN neighbouring molecules. 14 of 15 Dipole-dipole forces An IMF that results from the attraction between molecules with permanent dipoles 15 of 15
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