Which answer below correctly identifies the type of change and the explanation for the boiling of water?
A. physical change because even though the change caused the temperature of the water to increase, the water's physical properties remained exactly the same
B. physical change because even though gas formation was observed, the water was undergoing a state change, which means that its original properties are preserved
C. chemical change because gas formation was observed, which indicated that the water was transformed into a different substance
D. chemical change because a temperature change was observed, which indicated that the water was transformed into a different substance
Answer (2)
The boiling of water is a physical change because it undergoes a state change without altering its chemical composition. Water remains H2O during boiling, and its properties are preserved. Observations like increased temperature and steam are indicative of this phase change, not a chemical reaction. ;
Boiling water is a physical change because it changes from a liquid to a gas without altering its chemical composition. The water remains H₂O and retains its properties. Therefore, the correct answer is B: physical change because even though gas formation was observed, the water was undergoing a state change, which means that its original properties are preserved.
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