객관식
A student mixes vinegar (acetic acid) with baking soda (sodium bicarbonate), observes bubbling, then heats the resulting solution until a white solid forms. How many chemical changes occurred in this scenario?
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1. Intro to General Chemistry
Physical & Chemical Changes
Multiple Choice
Which statement about the physical change of liquid water boiling into steam is true?
A
Boiling water produces hydrogen and oxygen gases.
B
No new substances are formed during the boiling of water.
C
Boiling water is an example of a chemical change.
D
The chemical composition of water changes when it boils.
검증된 단계별 안내1
Understand the difference between physical and chemical changes: A physical change affects the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances with different chemical properties.
Identify what happens when liquid water boils: Boiling is the process where liquid water changes to water vapor (steam), which is a change in the state of matter from liquid to gas.
Recognize that during boiling, the molecules of water (H\_2O) remain chemically the same; only their physical state changes, so no new substances are formed.
Evaluate the given statements: Boiling water does not produce hydrogen and oxygen gases separately, it is not a chemical change, and the chemical composition of water does not change during boiling.
Conclude that the true statement is: 'No new substances are formed during the boiling of water,' because boiling is a physical change involving a phase transition.
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