During an expedition to a distant crystalline asteroid, planetary chemist Dr. Vanya isolates two pure, homogeneous samples labeled Substance X and Substance Y. Laboratory tests confirm that Substance X cannot be broken down into simpler substances by any chemical reactions or electrical currents, whereas heating Substance Y causes it to decompose into two distinct gases with completely different chemical behaviors. Based on the scientific classification of matter, which statement correctly classifies and compares these two specimens?

A) Both substances are elements because each is homogeneous and displays fixed physical constants.

B) Substance X is a compound because it resists chemical change, while Substance Y is a homogeneous mixture.

C) Substance X is an element, while Substance Y is a compound composed of chemically combined elements with distinct properties.

D) Substance X is a compound composed of identical atoms, whereas Substance Y is an element undergoing an allotropic transformation.

Elements and compounds Original Scenario-Based Practice

Chemistry · Matter · Chemistry · Classification of Matter

1 Chemistry practice questions on Elements and compounds. Questions built around original scenarios.

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Matter · Chemistry

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