Which of the following is a pure substance and why? A. Salad because its parts are easily separated. B. Water because it only it is only made of water molecules. C. Smoothies because they have several different parts. D. Apple juice became or is only one color.

Answer 1

The correct answer is B. Water because it is only made of water molecules.

A pure substance is defined as a material that has a consistent composition and properties throughout. Water (H2O) is a pure substance because it consists only of water molecules, regardless of its state (liquid, solid, or gas).

• Option A (salad) contains various ingredients that can be easily separated, making it a mixture, not a pure substance.
• Option C (smoothies) also have different components, which means they are mixtures.
• Option D (apple juice) may appear uniform, but it can contain a variety of substances (like sugars, acids, and water), making it a mixture as well.

Thus, water is the only option that fits the definition of a pure substance.