Question
6. Which of the following is the best example of a physical change? \( \begin{array}{ll}\text { F Toasting bread } \\ \text { Helting wax } \\ \text { H } & \text { Frying an egg } \\ \text { Rusting metal }\end{array} \)
Ask by Tran Black. in the United States
Feb 26,2025
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Answer
Melting wax is the best example of a physical change.
Solution
The best example is melting wax. When wax is heated, it changes from a solid to a liquid, but its chemical composition remains the same, which is a hallmark of a physical change. In contrast, toasting bread, frying an egg, and rusting metal all involve chemical reactions that produce new substances.
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When you're toasting bread, you're causing the surface to brown through the Maillard reaction, which is a chemical change due to the formation of new flavors and aromas. But heating wax? That’s a classic physical change! As you heat it, the solid wax melts into a liquid, but when you cool it down, it solidifies again, making it reversible. Cooking an egg, however, isn't so simple! Frying an egg involves denaturation, where the proteins in the egg transform permanently from their raw state to a firm state when exposed to heat. Unlike melting wax, you can't revert the cooked egg back to its liquid form, making it a chemical change too!
