객관식
Which of the following represents a reversible change?
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3. Matter and Energy
Physical & Chemical Changes
객관식
Which of the following is a physical change?
A
Milk sours when left out of the refrigerator
B
Tums (containing CaCO3) neutralizes stomach acid.
C
Sugar caramelizing when heated on a skillet.
D
Tearing a piece of paper.
검증된 단계별 안내1
Understand the difference between physical and chemical changes. A physical change affects the form of a chemical substance, but not its chemical composition. In contrast, a chemical change results in the formation of one or more new substances with new chemical properties.
Examine each option to determine if it involves a change in chemical composition or just a change in physical form.
Consider the option 'Milk sours when left out of the refrigerator'. This involves a chemical change because new substances are formed as the milk spoils.
Look at the option 'Tums (containing CaCO3) neutralizes stomach acid'. This is a chemical change because it involves a reaction between calcium carbonate and stomach acid, producing new substances.
Evaluate the option 'Tearing a piece of paper'. This is a physical change because the paper is only changing its shape and size, not its chemical composition.
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