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.
an increase in temperature (exothermic reaction). 3. Unstable product: Some chemical reactions produce gas because one of the products formed in the reaction is unstable . Two such products are listed below: Carbonic acid H 2 CO 3 (aq) ï¬ CO 2 (g) + H 2 O (l) Sulfurous acid H 2 SO 3 (aq) ï¬ SO 2 (g) + H 2 O (l) When either of these products appears in a chemical reaction, they should be replaced with their decomposition products. 2 HCl (aq) + Na 2 CO 3