AS Chemistry Keywords Edexcel

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Relative Atomic Mass
the average mass of an atom of an element, compared to the 1/12th the mass of an atom of a carbon-12 isotope
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relative molecular mass
the sum of the relative atomic masses of all the atoms in its molecular formula
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relative formula mass
the weighted average mass of the formula units relative to 1/12th of the mass of a carbon-12 isotope
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relative isotopic mass
the mass of an atom of an isotope compares to the mass of an atom of a carbon-12 isotope
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use of mass spectrometer
to find the relative atomic masses of an atom or determine the structure of a molecule
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stages of mass spectrometer
ionisation, acceleration, deflection, detection
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ionisation energy down a group
decreases
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ionisation energy across a period
increases
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1st ionisation energy
the enthalpy required to remove 1 mole of electrons from 1 mole of gaseous atoms to form 1 mole of 1+ gaseous ions
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2nd ionisation energy
the enthalpy required to remove 1 mole of electrons from 1 mole of gaseous atoms to form 1 mole of 2+ ions
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4 types of subshell
s,p,d,f
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shape of S orbitals
sphere
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shape of P orbitals
figure of 8
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isotope
atoms of the same element with the same number of protons, but different number of neutrons
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Other cards in this set

Card 2

Front

relative molecular mass

Back

the sum of the relative atomic masses of all the atoms in its molecular formula

Card 3

Front

relative formula mass

Back

Preview of the front of card 3

Card 4

Front

relative isotopic mass

Back

Preview of the front of card 4

Card 5

Front

use of mass spectrometer

Back

Preview of the front of card 5
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