Definitions in CH1

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Define: Standard enthalpy change of formation
is when 1 mole of substance is formed from its elements we they exist under standard conditions
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Define: Relative Atomic Mass (Ar)
weighted average mass of one atom of an element taking into account of relative abundance of all isotopes in its natural sample, compared to 1/12th of C-12 mass
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Define: Standard enthalpy change of combustion
is when 1 mole of substance is completely burnt in oxygen
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Define: Relative Molecular Mass (Mr)
weighted average mass molecule taking into account of relative abundance of all isotopes in its natural sample, compared to 1/12th of C-12 mass
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Define: Molar Mass
mass of one mole of substance (g mol-1)
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Define: Relative Isotopic Mass
mass of one atom of specific isotope compared to 1/12th of C-12 mass
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Define: First molar ionisation energy
energy required to remove one mole of outer electrons from one mole of gaseous atoms to give one mole of gaseous 1+ ions
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Define: Second molar ionisation energy
energy required to remove one mole of outer electrons from one mole of gaseous 1+ ions to give one mole of gaseous 2+ ions
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Define: Dynamic equilibrium
rate of forwards and reverse reactions are equal to each other
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Define: An acid
a substance which is a proton (H+ ion) doner
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Define: A base
a substance which is a proton (H+) acceptor
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Define: A pH scale
a logarithmic measure of H+ ion concentration
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Define: Brownfield
land previously used for industrial purposes
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Define: Greenfield
undeveloped land used for agriculture, landscape and nature
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Define: Effective Nuclear Charge (E.N.C)
is the charge felt by the outer electron, once incorporating the number of inner shielding electrons that surround the nucleus
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Other cards in this set

Card 2

Front

weighted average mass of one atom of an element taking into account of relative abundance of all isotopes in its natural sample, compared to 1/12th of C-12 mass

Back

Define: Relative Atomic Mass (Ar)

Card 3

Front

is when 1 mole of substance is completely burnt in oxygen

Back

Preview of the back of card 3

Card 4

Front

weighted average mass molecule taking into account of relative abundance of all isotopes in its natural sample, compared to 1/12th of C-12 mass

Back

Preview of the back of card 4

Card 5

Front

mass of one mole of substance (g mol-1)

Back

Preview of the back of card 5
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