Respuesta :

Answer:

A. Hardness

Explanation:

Physical property is those that can be observed without changing the substance directly. This includes hardness, color, volume, etc.

Chemical property is observed by changing the chemical identity of the substance, for example, corrosion, oxidation, etc. Flammability, Reactivity, and Toxicity all fall under this category.

The physical property of a substance among the options is; Choice A: Hardness

The physical properties of a substance include properties which can be assessed about a substance without the substance going through any change.

On the other hand, chemical properties of a substance are properties which can only be assessed after the substance undergoes a chemical change..

  • The option Flammability can be assessed only upon ignition of the substance.

  • The option reactivity requires a chemical change to be measured.

  • The option Toxicity can only be assessed after testing with another entity(a biological specie perhaps).

Hence, Hardness is the only physical property of a substance among the options above.

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