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.
Thus, the reaction of magnesium with oxygen is an oxidation-reduction reaction. A reaction that is not an oxidation-reduction reaction will cause no changes in oxidation numbers. Consider the reaction of sodium hydroxide with hydrochloric acid: Below each element in the equation, we have written its oxidation number.elow each element in each substance in the equation, we have written its oxidation number. The oxidation number of magnesium increases from 0 to +2; magnesium is oxidized. The oxidation number of oxygen decreases from 0 to -2; oxygen is reduced.