Classification of Penicillin. 1  Natural Penicillins (Penicillin V, Penicillin G, Benzathine, Procaine Penicillin) 2  Penicillinase-Resistant Penicillins (Oxacillin, Dicloxacillin, Cloxacillin, Methicillin, Nafcillin) 3  Aminopenicillins (Amoxicillin, Bacampicillin, Ampicillin) 4  Extended Spectrum Penicillins.
the system is usually defined as the chemical reaction and the boundary is the container in which the reaction is run in the course of the reaction heat is either given off or absorbed by the system furthermore the system either does work on it surroundings or has work done on it by its surroundings
The mass in a chemical reaction is constant in a closed system. However, if a chemical reaction is completed in an open system, mass changes may occur. These mass changes allow scientists to monitor rates of reaction (the rate of production of a product or rate of use of reactant).ut, if the chemical reaction happens in an open system (where air can get in and out), then mass may appear to change. In this simulation we will explore the mass changes in chemical reactions and endeavour to explain why they have occurred.