A laboratory technician analyzes three pure, homogeneous samples labeled X, Y, and Z. Heating sample X causes it to chemically break down into two distinct pure substances, whereas subjecting sample Y to electrolysis yields no simpler substances. Sample Z is synthesized by chemically combining sample Y with carbon in a fixed mass ratio, producing a substance with properties entirely different from its constituents. Based on these experimental observations, which of the following statements is correct regarding substances X, Y, and Z?

A) Substance X must be an element because it exists as a single homogeneous phase before heating.

B) Substance Y can be separated into simpler constituent substances using fractional distillation.

C) Substances X and Z are chemical compounds, whereas substance Y is an element.

D) Substance Z is classified as a mixture because it is produced by combining two distinct pure substances.

Elements and compounds Transitional Reasoning Practice

Chemistry · Matter · Chemistry · Classification of Matter

1 Chemistry practice questions on Elements and compounds. Questions that build towards applied reasoning.

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Matter · Chemistry

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