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.
Exothermic reactions are not necessarily spontaneous. Take the combustion of magnesium for example: #2Mg_((s))+ O_(2(g))rarr2MgO_((s))#. #DeltaH# is negative. Yet a piece of magnesium is quite safe to handle at room temperature. This is because a very high temperature is needed to make the magnesium burn.