Question

1. which of the following is not a phase change?

a) melting

b) burning

c) freezing

d) boiling

Explanation:

Define phase changes vs. chemical changes

Phase changes (melting, freezing, boiling) are physical transitions between states of matter (solid, liquid, gas) without altering chemical composition.

Analyze the given options

• Melting: physical transition from solid to liquid.
• Burning: chemical reaction (combustion) that alters chemical composition.
• Freezing: physical transition from liquid to solid.
• Boiling: physical transition from liquid to gas.

Identify the non-phase change

Burning is a chemical change, not a physical phase change.

Answer:

• A) melting
• B) burning (Correct answer)
• C) freezing
• D) boiling