Zinc is silver, metallic, with a lustrous shine. It is shaped into sheets of bars. These are all visible with the naked eye, making them physical properties.
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physical properties can be observed without changing the identity and composition of the substance. This includes things like physical observations (color, texture) melting and boiling points, density, and state. Chemical properties describe how substances react with other substances. This means that properties that involve other substances will tend to be chemical properties.