A LEVEL CHEMISTRY WITH VERIFIED QUESTIONS AND ANSWERS

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A LEVEL CHEMISTRY WITH VERIFIED QUESTIONS AND ANSWERS Weak acid - an acid that is only slightly ionised/dissociated in aqueous solution Oxidation - loss of electrons Reduction - gain of electrons Ionic bonding - The electrostatic attraction between oppositely charged ions Covalent bonds - sharing of a pair of electrons Electronegativity - the ability of an atom to attract the electrons in a covalent bond Relative atomic mass - The weighted mean mass of an atom of an element compared with one-twelfth of the mass of an atom of carbon-12. Relative isotopic mass - The mass of an atom of an isotope compared with one-twelfth of the mass of an atom of carbon-12. empirical formula - The simplest whole number ratio of atoms of each element present in a compound molecular formula - A chemical formula that shows the number and kinds of atoms in a molecule, but not the arrangement of the atoms. anhydrous - without water Hydrated - A crystalline compound containing water molecules Water of crystallisation - Water molecules that are bonded into a crystalline structure of a compound strong acid - an acid that ionises/dissociates completely in aqueous solution 1st ionisation energy - ANSWERenergy change when one mole of electrons is removed from one mole of gaseous atoms Metallic bonding - ANSWERthe chemical bonding that results from the attraction between metal ions and the surrounding delocalised electrons Disproportionation - ANSWERThe oxidation and reduction of the same element in a redox reaction Activation energy - ANSWERthe minimum amount of energy required to start a chemical reaction standard enthalpy of formation - ANSWERenthalpy change if 1 mole of compound in standard state were formed directly from its elements

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