Achemical 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

B: It was a compound

Explanation:

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.

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