A good contract bookkeeper is able to: 1  Set up accounting systems and software properly. 2  Enter transactions. 3  Perform checks, reconciliations and end of year processes.  Ensure they are up to speed with legislative requirements and management 1  reports. Undertake payroll duties and compliance.
An active metal is a metal that displaces hydrogen from an acid. Examples of active metals include magnesium, zinc and iron. This type of reaction is also called a single displacement reaction where the active metal 'displaces' the hydrogen from the acid. Examples of reactions involving acids and active metals. 1  Hydrochloric acid + Magnesium â Magnesium chloride + Hydrogen.
The oxidation or combustion of magnesium in air has long been used as a source of intense light in photography and for other photochemical reactions. The energy released in this combustion occurs as the magnesium reacts with oxygen in the air according to the equation:2 Mg (s) + O 2 (g) â 2 MgO (s).The heat of formation of magnesium oxide is -601.83 kJ/mol.he energy released in this combustion occurs as the magnesium reacts with oxygen in the air according to the equation: 2 Mg (s) + O 2 (g) â 2 MgO (s). The heat of formation of magnesium oxide is -601.83 kJ/mol.