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.

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.