First 271 words of the document:
Definitions for Module 1
Relative Isotopic Mass mass of an atom compared to 1/12 the mass of an atom of
Relative Atomic Mass weighted mean mass of an atom of an element compared with 1/12
of the mass of an atom of carbon12.
Relative Molecular Mass weighted mean mass of a formula unit compared with 1/12 of
the mass of an atom of carbon12.
Mole the amount of any substance containing as many atoms as there are in 12g of carbon
Molar mass mass per mole of a substance in g mol^1
Empirical formula simplest mole ratio of elements in a compound
Molecular formula actual number of atoms of each element in a molecule
Molar volume volume per mole of a gas. At RTP molar volume is 24 dm^3 mol^1
Concentration amount of solute in mol dissolved per dm^3 of solution
Standard solution solution of known concentration. Standard solutions are normally used
An acid is a proton donor and a base is proton acceptor. An alkali is a base that dissolves
into water forming hydroxide ions.
Salt chemical compound formed from an acid when an H+ ion from the acid has been
replaced by a metal ion or other positive ion.
Hydrated a crystalline compound containing water molecules.
Anhydrous a substance with no water molecules.
Oxidation number a measure of the number of electrons that an atom uses to bond with
atoms of another element
Oxidation is loss of electrons. Reduction is gain of electrons.