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Question
determine whether each statement is an example of a physical change or a chemical change. newspaper yellows in the sun. physical chemical wax melts on a hot stove. physical chemical done
For "Newspaper yellows in the sun":
A chemical change involves a change in the chemical composition of a substance. When a newspaper yellows in the sun, the paper's components (like lignin or dyes) undergo a chemical reaction due to sunlight exposure, forming new substances that cause the yellowing. So this is a chemical change.
A physical change is a change in the physical state (like solid to liquid, liquid to gas, etc.) of a substance without changing its chemical composition. Wax melting on a hot stove changes from solid to liquid wax, but the chemical nature of wax remains the same. So this is a physical change.
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