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Calcium is dull gray, but it is shiny when scratched. Other physical properties. Calcium is an excellent conductor of electricity. It is very soft and easily scratched. Chemical properties. Calcium reacts rapidly with air to form a coating of gray oxide, and it burns with a red flame.
Quick Answer. Density is a physical property because its measurement or observation does not alter the chemical composition of a substance. Other physical properties include color, texture, melting point and volume. When a chemical property, such as flammability or oxidation, is observed, one substance changes into another.