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16 Cards in this Set
- Front
- Back
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Mass number
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Mass number = number of protons + neutrons (in the nucleus/atom)
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Relative atomic mass
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The mean mass of an atom of an element compared to one twelfth the mass of a 12C atom.
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First ionisation energy
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The energy required to remove 1 (mole) electron(s) from 1 (mole) gaseous atom(s), forming 1 (mole) ion(s) with a single positive charge.
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Mole
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The amount of a substance that contains the same number of particles as there are atoms in exactly 12g of 12C.
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Empirical formula
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A formula which gives the simplest whole number ratio of atoms of each element in a compound.
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Covalent bond
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A shared pair of electrons.
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Co-ordinate (dative) bond
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A covalent bond in which the shared pair of electrons are provided by just one of the bonded atoms.
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Electronegativity
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The power of an atom to withdraw electron density from a covalent bond.
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Atomic radius
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The distance from the centre of the nucleus to the outer electrons of an atom.
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Structural isomerism
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Compound which have the same molecular formula but different structures/different structural formulae/different displayed formulae.
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Cracking
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A process used by the petroleum industry to produce shorter alkanes and alkenes from longer alkanes.
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How to calculate n
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= m/Mr
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Ideal gas equation
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pV=nRT (remember to convert units)
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How to calculate concentration
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C=n/V (remember to divide cm3 by 1000)
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How to calculate atom economy
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= (relative) mass desired product / x 100
(relative) mass all reactants |
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How to calculate percentage yield
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= actual yield / x 100
theoretical yield |
