객관식
Which of the following best describes the molecular changes that occur when ice cream melts and becomes a liquid?
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1. Intro to General Chemistry
Physical & Chemical Changes
객관식
Which of the following is NOT a physical change?
A
Burning of magnesium ribbon
B
Melting of ice
C
Dissolving sugar in water
D
Evaporation of alcohol
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 one or more new substances with different properties.
Analyze each option to determine if it involves a change in chemical composition or just a change in physical state or appearance.
Melting of ice is a physical change because it involves changing water from solid to liquid without altering its chemical structure (H\_2O remains H\_2O).
Dissolving sugar in water is a physical change because sugar molecules disperse in water but do not chemically react or change their molecular structure.
Burning of magnesium ribbon is a chemical change because magnesium reacts with oxygen in the air to form magnesium oxide, a new substance with different chemical properties.
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