1 e) Chemical Formulae, Equations & Calculations
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Empirical Formula
Simplest whole-number ratio of the atoms present in a compound.
Mole
A unit of the amount of substance containing the same number of particles as there are carbon atoms in 12g of C-12.
Water of Crystallisation
Water molecules that are part of a crystal structure in which they are chemically bound up with a salt, represented by ·nH2O.
Anhydrous
Without water
Aqueous
Dissolved in water
Balancing the equation
Putting coefficients in front of formulae so that the same number of atoms of each type is on both sides of an equation.
Coefficient
Number written in front of formulae in a balanced chemical equation.
Formula
Representation of a chemical showing the elements present.
Molar Mass
Mass of 1 mole of a substance
Molar Volume
Volume occupied by 1 mole of a gas
Molecular Formula
Actual number of each type of atom present in a molecule.
Relative Formula Mass
The weighted average mass of a formula unit of a compound, relative to the mass of 1/12th of a C-12 atom. (sometimes called relative molecular mass)
Word Equation
Representation of a chemical reaction using the names of the chemicals only.
Yield
Amount of something that is produced in a reaction.