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Paper 1 definitions

Define atomic number Number of protons in atoms nucleus
Define mass number Number of protons and neutrons in atoms nuclues
Define Avogadro's number Constant for the amount of atoms in a substance. Also the number of atoms in one mole of C-12
Define isotopes An atom of the same element with a different number of Neutrons and same number of Protons
Define empirical formula The simplest ratio of atoms of each element in a single compound
Define relative atomic mass Average mass of atoms compared to C-12
Define relative molecular mass Ratio of average mass of one molecule of an molecule compared to the mass of 1/12 of C-12
Define relative isotopic mass Ratio of average mass of one molecule of an isotope compared to the mass of 1/12 of C-12
Define first ionization energy energy required to remove 1 electron from an atom in its gaseous form to make a 1+ ion
Define second ionization energy energy required to remove 1 electron from an 1+ ion in its gaseous form to make a 2+ ion
Define dative covalent bonding also known as coordinate bonding Where the shared electron in the covalent bond comes from a single atom
Define electronegativity How strongly an atom attracts pair of electrons in a bond
Define polar bond One part of a molecule is slightly more negative or positive then the rest
Define exothermic A reaction that gives out energy to its surroundings
Define endothermic A reaction that takes in energy from its surroundings
Define enthalpy change The energy change in a reaction taking place under a constant pressure
Define specific heat capacity amount of energy required go raise the temperature of one gram of a substance by 1c (equal to 1k)
Define standard state 100k Pascals, 298 kelvin = 25 degrees
Define Hess law The total enthalpy change between products and reactants are the same
Define standard enthalpy of formation The change of enthalpy during the formation of 1 mole of the compound by its individual elements
Define standard enthalpy of combustion The change of enthalpy during the complete combustion in an excess of oxygen in standard state and conditions.
Define bond enthalpy Energy required to break one mole of a bond.
Moles=Mass x ? Mr
Created by: Study02



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