Chemical and Physical Properties and Changes

Question 1

What is a physical property?

Answer 1

A characteristic that can be observed without changing the substance’s chemical identity (e.g., color, melting point).

Examples of physical properties include density, boiling point, and state of matter.

Question 2

What is a chemical property?

Answer 2

A characteristic that describes a substance’s ability to undergo a chemical change (e.g., flammability, reactivity).

Chemical properties can only be observed during a chemical reaction.

Question 3

What is the difference between a chemical change and a physical change?

Answer 3

Chemical change: Produces new substances.
Physical change: Alters form but not composition.

Burning wood is a chemical change, while melting ice is a physical change.

Question 4

What is an intensive property?

Answer 4

A property that does not depend on the amount of substance (e.g., density, temperature).

Intensive properties remain the same regardless of the quantity of material.

Question 5

What is an extensive property?

Answer 5

A property that depends on the amount of substance (e.g., mass, volume).

Extensive properties change when the quantity of the material changes.