Question

is flamability reactivity melting point toxicity and heat of combustion all a chemical property

Answer 1

Short answer: No — most of those are chemical properties, but melting point is a physical property.

Why:
- Chemical property: describes how a substance reacts or changes into other substances. Examples from your list:
- Flammability: whether it burns (combusts) — chemical.
- Reactivity: how it reacts with other chemicals (acid, oxidizers, water, etc.) — chemical.
- Toxicity: depends on chemical interactions with biological systems, so it is considered a chemical property (it arises from the substance’s chemistry).
- Heat (enthalpy) of combustion: the energy change when it chemically combusts — chemical.

- Physical property: can be observed or measured without changing the substance’s chemical identity.
- Melting point: temperature at which a solid becomes a liquid without a chemical change — physical.

So: flammability, reactivity, toxicity, and heat of combustion = chemical properties; melting point = physical property.