Difficulty: Easy

Average Score: 100%

Which of the following describes a chemical property of substrate X?

Rationale

X reacts with nitric acid to form a noxious brown gas.

This statement describes a chemical property of substrate X, as it indicates a reaction with nitric acid that results in the formation of new substances. Chemical properties are defined by how a substance interacts with other chemicals, which is precisely what this choice illustrates.

A (X is a good conductor of electricity.) YOUR ANSWER

This describes a physical property of substrate X, as conductivity pertains to its ability to conduct electric current. While this property can be important in various applications, it does not involve a chemical change or interaction with other substances.

B (The melting point of X is 1,083 °C.) YOUR ANSWER

This is another physical property, specifically a measure of the temperature at which substrate X transitions from solid to liquid. Melting point does not provide information about chemical reactivity or how X interacts with other chemicals.

D (When heated to 215 °C, X evaporates.) YOUR ANSWER

This choice describes a physical change, as it refers to the transition from a liquid to a gas when heated. Evaporation does not involve a chemical reaction or the formation of new substances, thus failing to illustrate a chemical property of substrate X.

Conclusion

Chemical properties are characterized by a substance's ability to undergo changes that result in the formation of new substances, as seen in the correct answer where substrate X reacts with nitric acid. In contrast, the other options all describe physical properties or changes, highlighting the distinction between how a substance behaves chemically versus physically. Understanding these differences is crucial in the study of material interactions.

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