alleryStart learning →Water is boiled and turns into steam. Why is this counted as a physical change?
AIts mass falls by a little
BIts identity does not change
CNew bonds form inside it
DIt cannot ever be reversed
Answer & Solution
Correct answer: B. Its identity does not change
1. In a physical change the particles themselves are not broken up.
2. Boiling moves the water molecules further apart but leaves each molecule whole.
3. During a physical change the form of matter may change but not its identity.
4. All changes of state are physical changes for this reason.
_Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 13: Physical and chemical change_
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