David says, "Pure honey has nothing else added." Susan says,"The honey is not really pure. It is mixture of many subsatnces. Who is right? Explain your answer.

Really, both David and Susan are right; they were using the term "pure" in different ways. David likely meant "pure honey" in the sense that the honey was not altered or had any additives. Susan used pure as in a "pure substance" in chemistry. Susan is also right, because honey is a medley of carbohydrates, proteins, amino acids, and vitamins and minerals. Chemically, honey is not a pure substance - it's a mixture.