Formulae

What the syllabus asks of you

• State the formulae of the elements and compounds named in the subject content
• Define the molecular formula of a compound as 5 Define the empirical formula of a compound as the number and type of different atoms in one the simplest whole number ratio of the different molecule atoms or ions in a compound
• Deduce the formula of a simple compound 6 Deduce the formula of an ionic compound from the relative numbers of atoms present in a from the relative numbers of the ions present model or a diagrammatic representation in a model or a diagrammatic representation or from the charges on the ions
• Construct word equations and symbol 7 Construct symbol equations with state equations to show how reactants form symbols, including ionic equations products, including state symbols 8 Deduce the symbol equation with state symbols for a chemical reaction, given relevant information