객관식
Which of the following represents a reversible change?
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1. Matter and Measurements
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 physical or chemical change. For example, when milk sours, it undergoes a chemical change as new substances are formed.
Consider the process of Tums neutralizing stomach acid. This is a chemical change because it involves a reaction between calcium carbonate (CaCO3) and hydrochloric acid (HCl) in the stomach, producing new substances.
Analyze the caramelization of sugar. This is a chemical change because heating sugar causes it to break down and form new compounds, changing its chemical structure.
Identify tearing a piece of paper as a physical change. Tearing paper changes its shape and size but does not alter its chemical composition, making it a physical change.
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