Final answer:
A trash can with burning paper is classified as a Class A fire, which involves ordinary combustibles like paper. Flammability is a chemical property, while melting point, boiling point, and density are physical properties.
Step-by-step explanation:
A trash can with burning paper is classed as a Class A fire. This classification is due to the material involved in the fire, which is ordinary combustibles such as wood, paper, and cloth. When addressing the question about chemical properties, flammability is a chemical property because it describes the ability of a substance to burn or ignite, causing fire or combustion
In contrast, melting point, boiling point, and density are considered physical properties because they describe the conditions under which a material changes states or the measurement of its mass per unit volume, respectively, without changing its composition.