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4.1 Stoichiometry
4.1 Stoichiometry
Core
Core
• Use the symbols of the elements and write the formulae of simple compounds
• Deduce the formula of a simple compound from the relative numbers of atoms present
• Deduce the formula of a simple compound from a model or a diagrammatic representation
• Construct word equations and simple balanced chemical equations
• Define relative atomic mass, Ar, as the average mass of naturally occurring atoms of an element on a scale where the 12C atom has a mass of exactly 12 units
• Define relative molecular mass, Mr, as the sum of the relative atomic masses. (Relative
formula mass or Mr will be used for ionic compounds.)
(Calculations involving reacting masses in simple proportions may be set. Calculations
will not involve the mole concept.)
Supplement
Supplement
• Determine the formula of an ionic compound from the charges on the ions present
• Construct equations with state symbols, including ionic equations
• Deduce the balanced equation for a chemical reaction, given relevant information
4.2 The Mole Concept
4.2 The Mole Concept
Supplement
Supplement
• Define the mole and the Avogadro constant
• Use the molar gas volume, taken as 24 dm3 at room temperature and pressure
• Calculate stoichiometric reacting masses, volumes of gases and solutions, and
concentrations of solutions expressed in g / dm3 and mol / dm3. (Calculations involving
the idea of limiting reactants may be set. Questions on the gas laws and the conversion of gaseous volumes to different temperatures and pressures will not be set.)
• Calculate empirical formulae and molecular formulae
• Calculate percentage yield and percentage purity
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