Question

(01.04 lc)
what best defines an extensive property of a substance?

a physical property that depends on the sample size
a physical property that is not dependent on sample size
a property that is observable
a property that is measurable

Explanation:

To determine the correct definition of an extensive property, we recall the concept: Extensive properties of a substance are physical properties that depend on the amount (or sample size) of the substance present. For example, mass, volume, and energy are extensive properties—their values change with the quantity of the substance.

• Option 1: "A physical property that depends on the sample size" matches the definition of an extensive property.
• Option 2: This describes intensive properties (e.g., density, boiling point), which do not depend on sample size.
• Option 3: "A property that is observable" is too vague and does not specifically define extensive properties (many properties are observable, both extensive and intensive).
• Option 4: "A property that is measurable" is also too general, as both extensive and intensive properties can be measurable.

Answer:

A. A physical property that depends on the sample size