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ⓘ Chemical change. A chemical change is a change of materials into other materials with different properties. Chemical changes occur when a substance combines wit ..




                                               

Selenium fluoride

                                               

Selenium chloride

                                               

Tellurium chloride

                                               

Tellurium fluoride

                                               

Phosphorus chloride

                                               

Antimony chloride

                                               

Tellurium oxide

                                               

Tellurium bromide

                                               

Arsenic fluoride

Arsenic fluoride can refer to either of these chemical compounds: Arsenic trifluoride, AsF 3, colorless liquid Arsenic pentafluoride, AsF 5, colorless gas

Chemical change
                                     

ⓘ Chemical change

A chemical change is a change of materials into other materials with different properties.

Chemical changes occur when a substance combines with another to form a new substance, or, chemical decomposition into two or more different substances. These processes are called chemical reactions.

Burning of wood is a chemical change as new substances which cannot be changed back e.g. carbon dioxide are formed. For example, if wood is burned in a fireplace, there is not wood anymore but ash. Other examples include burning of a candle, rusting of iron, baking a cake, etc. Special details that describe how a chemical change takes place are called chemical properties.

Compare: physical change. The opposite of a chemical change is a physical change. Physical changes are a change in which no new substances are formed, and the substance which is changed is the same. For instance, if a stick of wood is broken, there is still a stick of wood; it is just broken.

More examples include changes of shape, changes of states, passing electricity through a copper wire, breaking of wood, shattering of glass, pouring of water, etc. Special details which do not change in a substance without new substances being formed are called physical properties.