Question

which of the following is a physical property?

flammability
heat of combustion
solubility
toxicity

Explanation:

Define physical and chemical properties

Using the Physical Quantities knowledge point, we distinguish between physical and chemical properties. A physical property is observed without changing the substance's identity. A chemical property describes how a substance reacts to form new substances.

Analyze flammability and combustion

Flammability and heat of combustion describe how a substance burns and reacts with oxygen. These processes change the chemical identity of the substance, making them chemical properties.

Analyze toxicity

Toxicity describes how a substance chemically interacts with biological systems to cause damage. This interaction alters the chemical makeup of the system, so it is a chemical property.

Analyze solubility

Solubility is the ability of a substance to dissolve in a solvent. Dissolving is a physical change because the solute's chemical identity remains unchanged and can be recovered. Thus, solubility is a physical property.

Answer:

• (A) Flammability
• (B) Heat of combustion
• (C) Solubility (Correct answer)
• (D) Toxicity