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F331 chem key words

F331 OCR B salters chemistry key words

QuestionAnswer
Half life time taken for the level of activity to drop to half its original value
Enthalpy change of combustion enthalpy change when one mole of a compound is completely burned in oxygen
enthalpy change of formation enthalpy change when one mole of a compound is formed from its elements in their standard states
entropy measure of disorder or the number of ways of arranging molecules / atoms
octane number tendancy of a fuel to autoignite. The higher the number, the less likely
full structural formula shows every atom and every bond in an organic molecule
shortened structural formula shows groups of atoms around each carbon atom in an organic molecule
skeletal shows the carbon skeleton only of an organic molecule
catalyst speeds up a chemical reaction and can be recovered chemically unchanged. Provides an alternative pathway with a lower activation enthalpy
beta particle an electron emitted from the nucleus
gamma radiation electromagnetic radiation emitted from the nucleus
linear 2 groups of electrons which repel to be as far away from each other as possible. Bond angle of 180 degrees
trigonal planar 3 groups of electrons which repel to be as far away from each other as possible. Bond angle of 120 degrees
tetrahedral 4 groups of electrons which repel to be as far away from each other as possible. Bond angle of 109 degrees
octahedral 6 groups of electrons which repel to be as far away from each other as possible. Bond angle of 90 degrees
endothermic reaction a reaction which takes in energy. Feels cold. Sign of dH is positive
alkane a hydrocarbon. Contains only single bonds
alkene a hydrocarbon. Contains carbon carbon double bonds
arene a hydrocarbon. Contains a ring with alternating double and single bonds
alcohol contains a hydroxyl group, an oxygen bonded to a hydrogen atom
ether contains a n oxygen atom sandwiched between 2 carbon atoms
isomerisation the catalysed rearrangement of straight chain alkanes into branched alkanes
reforming the catalysed rearrangement of straight chain alkanes into ring compounds
cracking the catalysed reaction of straight chain alkanes to form a shorter chain alkane and an alkene
alpha particle a helium nucleus, 2 protons and 2 neutrons
isotope atoms which have the same number of protons and electrons but a different number of neutrons
Avogadro's constant the number of atoms / molecules in one mole of something
bent 4 groups of electrons (2 bonding pairs and 2 lone pairs) which repel to be as far away from each other as possible. Bond angle of 109 degrees
pyramidal 4 groups of electrons (3 bonding pairs and 1 lone pair) which repel to be as far away from each other as possible. Bond angle of 109 degrees
trigonal bipyramidal 5 groups of electrons which repel to be as far away from each other as possible. Bond angles of 120 and 90 degrees
exothermic reaction a reaction which gives out energy. Feels hot Sign of dH is negative
heterogeneous in a different physical state
Created by: janice_mcc
 

 



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