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.
Double replacement reactions (also called âdouble displacementâ or âexchangeâ or âmetathesisâ reactions) have the general form AX + BY BX + AY Double replacement reactions typically form a product that is either molecular or ionic.ome gaseous products are CO 2, NH 3, and H 2 S. SOLUBILITY RULES One of the factors driving a double replacement reaction is the formation of a solid precipitate. A precipitate is an insoluble solid compound formed during a chemical reaction in solution.