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AS Foundation 1

TY - AS Foundation Definitions

QuestionAnswer
Relative Atomic Mass The average mass of an atom of an element compared with the mass of an atom of Carbon-12, where the mass of Carbon-12 is exactly 12.
Relative Molecular Mass The average mass of the molecules of a compound/element compared with the mass of an atom of Carbon-12, where the mass of Carbon-12 is exactly 12.
Relative Isotopic Mass The mass of an atom of an isotope compared with the mass of an atom of Carbon-12, where the mass of Carbon-12 is exactly 12.
Relative Formula Mass The average mass of formula unit of a compound compared with the mass of an atom of Carbon-12, where the mass of Carbon-12 is exactly 12.
The Mole The amount of substance that contains exactly the same number of particles as in 12g of Carbon-12, that is 6 x 1023.
Molar Mass The mass of one mole of a substance.
Empirical Formula Represents the simplest, whole number ratio of atoms of each element in a compound.
Molecular Formula Represents the actual number of atoms of each element in a molecule of a compound.
Avogadro’s Constant The number of atoms/molecules/ions/electrons in one mole, 6 x 1023.
First Ionisation Energy The energy required to remove one electron from each atom in a mole of atoms in the gaseous state
Water of Crystallisation Water molecules contained within the crystals of a salt
Anhydrous Salts which do not contain water of crystallisation eg CuSO4
Hydrated Salts which contain water of crystallisation eg CuSO4.5H2O
Created by: MrsT