Question

why is boiling water a physical change?

it makes new molecules.
it rearranges atoms.
it is a state of matter change.
it makes new substances.

Explanation:

Identify the nature of boiling water

Boiling water is a transition from liquid water to water vapor (gas). The chemical identity of the substance remains \(H_2O\) throughout the process.

Evaluate the options based on physical change criteria

• "It makes new molecules" and "It makes new substances" describe chemical changes.
• "It rearranges atoms" refers to chemical reactions where bonds are broken and formed.
• "It is a state of matter change" correctly defines a physical change, as only the physical state changes while the chemical composition remains identical.

Answer:

• (A) It makes new molecules.
• (B) It rearranges atoms.
• (C) It is a state of matter change. (Correct answer)
• (D) It makes new substances.