F331 chem key words Word Scramble
|
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Question | Answer |
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
Popular Chemistry sets