Changes in Matter

Question 6 • *26-27 CFISD TX-Chemistry A CR

Which answer below correctly identifies the type of change and the explanation for the boiling of water?

Answer

physical change because even though the change caused the temperature of the water to increase, the water’s physical properties remained exactly the same

physical change because even though gas formation was observed, the water was undergoing a state change, which means that its original properties are preserved

chemical change because gas formation was observed, which indicated that the water was transformed into a different substance

chemical change because a temperature change was observed, which indicated that the water was transformed into a different substance

Explanation

Boiling is a physical change: liquid water changes state into water vapor, but it remains H₂O. The bubbles are water vapor, not a new substance, so observing gas formation does not by itself show that a chemical change occurred. Therefore, the correct choice is “physical change because ... the water was undergoing a state change, which means that its original properties are preserved.”

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Instruction

Changes in Matter

Lab: Physical and Chemical Changes