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Chemistry AS Level AQA Physical Chemistry Revision
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Chemistry AS Level AQA Physical Chemistry Revision
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Chemistry AS Level AQA PhysicalChemistry Revision
Activation energy - Answer>> The minimum energy that a
particle needs in order to react
Atom economy - Answer>> mass of desired products/total
mass of reactants x 100
Atomic orbital - Answer>> A region of space where there is a
high probability of finding an electron
Avogadros constant - Answer>> The total number of particles in
one mole of a substance or 6.022 x 10^23
Catalyst - Answer>> A substance that alters the rate of a
chemical reaction but is not used up in the reaction
Carbocation - Answer>> An organic ion in which one of the
carbon atoms has a positive charge.
Co-ordinate bonding - Answer>> Covalent bonding in which
both the electrons in the bond comes from one of the atoms in the
bond.
Covalent bonding - Answer>> Describes a chemical bond in
which electrons are shared between two atoms
Delocalised electrons - Answer>> Electrons that are spread
over several atoms and help to bond them together
, Dipole-dipole forces - Answer>> An intermolecular force that
results from the attraction between molecules with permanent
dipoles
Displayed formula - Answer>> The formula of a compound
drawn out so that each atom and each bond is shown
Electron pair repulsion theory - Answer>> Pairs of electrons
around a central atom repel each other equally taking up positions
as far away as possible from each other
Electronegativity - Answer>> The power of an atom to attract a
pair of electrons in a covalent bond
Electrostatic forces - Answer>> The forces of attraction and
repulsion between electrically charged particles
Empirical formula - Answer>> The simplest whole number ratio
in which the atoms in a compound combine together
Endothermic - Answer>> Where heat is taken during a reaction
and the temperature drops
Exothermic - Answer>> Where heat is given out during a
reaction and the temperature rises
Hydrogen bonding - Answer>> Where a hydrogen atom
covalently bonded to an Nitrogen, Oxygen or Fluorine atom
interacts with another Nitrogen, Oxygen or Fluorine atom
Incomplete Combustion - Answer>> A combustion reaction in
which there is insufficient oxygen
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