Question

changes in matter
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a geochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation?
he is identifying the metal using physical properties only.
he is identifying the metal using chemical properties only.
he is identifying the metal using physical properties and chemical properties.
he is identifying the metal using neither physical properties or chemical properties.

Explanation:

Density, electrical conductivity, and melting point are all physical properties of a substance—characteristics that can be observed or measured without changing the substance's chemical composition. No chemical changes are involved in testing these properties, so the investigation relies solely on physical properties.

Answer:

A. He is identifying the metal using physical properties only.