Chemical Change

Name:
Chemical Change
Detailed information:
Rearrangement of the atoms, ions, or radicals of one or more substances resulting in the formation of new substances often having entirely different properties. Such a change is called a chemical reaction. In some cases, energy in the form of heat, light, or electricity is required to initiate the change; then the reaction is called endothermic. When energy is given off as a result of rupture of chemical bonds, the change is said to be exothermic. Chemical changes should be distinguished from physical changes, in which only the state or condition of a substance is modified, its chemical nature remaining the same. A physicochemical change has some of the characteristics of both. Examples of the three types areChemical Changesfuel+oxygen→CO2+water+heat(exothermic)water+CO2+energy→sugar+oxygen(endothermic)Physical Changeswater to ice or steam;crystallization;coagulationof latex distillation processesPhysiochemical Changescooking of food,vulcanization of rubber,tanningof leather,drying of oil- or plastic-based paints.