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.

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.

the answer is learned