Which property of rubbing alcohol is a chemical property? check all that apply. check all that apply. its flammability its melting point (-89 ∘c) its density (0.786 g/cm3) its boiling point (82.5 ∘c)?

Chemical properties and physical properties of a sample are two different things. Physical properties are the properties which can be measured and observed like melting point, boiling point, density, odor, color etc.
Chemical properties are the properties that are observed during a chemical reaction like chemical stability, flammability, toxicity etc.
So the answer to the question is flammability is a chemical property. Density, melting point, boiling point are physical properties.