Question

multiple choice questions

1. what is a characteristic of a physical change in matter?

a) light and heat are released
b) the composition is unchanged
c) new substances are created
d) an odor is produced.

Explanation:

To determine the characteristic of a physical change in matter, we analyze each option:

• Option a: Releasing light and heat is typical of chemical changes (e.g., combustion), not physical changes.
• Option b: Physical changes (like melting, freezing, or dissolving) do not alter the chemical composition of the substance. The substance remains the same at the molecular level.
• Option c: Creating new substances is a defining feature of chemical changes, not physical changes.
• Option d: Producing an odor often indicates a chemical reaction (e.g., rotting food), so it is not a physical change characteristic.

Answer:

b) The composition is unchanged