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A chemical property is one where some chemical reactions take place and the identity of the substance changes. Some examples of chemical properties are flammability, radioactivity, toxicity, etc. Physical properties, on the other hand, are the properties for which no change of identity takes place and the properties can be easily observed by touch, viewing, senses, etc. Examples of physical properties include melting point, density, mass, volume, etc.
Ductility is the capability of a substance to be drawn into wires. There is no change in identity of the substance and we can visually see a substance being drawn into wires. Hence ductility is not a chemical property, it is a physical property. Some examples of ductile materials, include metals such as copper, aluminium, silver, gold, etc.
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