객관식
Which of the following is a sign of a chemical change?
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1. Intro to General Chemistry
Physical & Chemical Changes
객관식
Which observation is a sign of a chemical change?
A
Melting of ice into liquid water
B
Formation of a gas when two solutions are mixed
C
Breaking a glass into smaller pieces
D
Dissolving sugar in water
검증된 단계별 안내1
Understand that a chemical change involves the formation of new substances with different properties, while a physical change only affects the state or appearance without changing the substance's identity.
Analyze each option to determine if it represents a chemical or physical change:
Melting of ice into liquid water is a physical change because it only changes the state from solid to liquid without altering the chemical composition of H\_2O.
Breaking a glass into smaller pieces is a physical change because the glass remains chemically the same, only its shape and size change.
Dissolving sugar in water is generally a physical change because sugar molecules disperse in water but do not chemically react to form new substances.
Formation of a gas when two solutions are mixed indicates a chemical change because the production of a gas suggests a chemical reaction has occurred, creating new substances.
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