A chemical reaction was used to separate a sample into its components. What conclusion about the sample can be formed based on the technique used?
A: It was a pure substance
B: It was a compound
C: It was a heterogeneous mixture
D: It was a homogeneous mixture

If a chemical reaction was used to separate a sample into its components, then it was a compound. For example, water (H2O, a compound) can be separated by electrolysis into oxygen and hydrogen (its components). the chemical reaction is:

2 H2O -> O2 + 2 H2

Heterogeneous and homogeneous mixtures can be separated by physical ways. Pure substance can be either a compound or an element, so this option is not specific enough to be the correct answer.

A chemical reaction was used to separate a sample into its components. What conclusion about the sample can be formed based on the technique used? A: It was a pure substance B: It was a compound C: It was a heterogeneous mixture D: It was a homogeneous mixture

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A chemical reaction was used to separate a sample into its components. What conclusion about the sample can be formed based on the technique used?
A: It was a pure substance
B: It was a compound
C: It was a heterogeneous mixture
D: It was a homogeneous mixture