객관식
Which of the following sentences describes an example of sublimation?
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1. Intro to General Chemistry
Physical & Chemical Changes
객관식
A container is observed to have water boiling and turning into steam. What does this represent about the type of change happening in the container?
A
A nuclear change, because the water molecules are splitting into atoms.
B
A physical change, because the water is changing state but not its chemical composition.
C
A chemical change, because new substances are formed during boiling.
D
No change is occurring, because boiling is not a change.
검증된 단계별 안내1
Identify the process described: water boiling and turning into steam is a phase change from liquid to gas.
Recall that a physical change involves a change in the state or appearance of a substance without altering its chemical composition.
Understand that during boiling, water molecules remain H\_2O; they do not break down into atoms or form new substances.
Recognize that a chemical change involves the formation of new substances with different chemical properties, which does not happen here.
Conclude that boiling water is a physical change because it changes state but the chemical identity of water remains the same.
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