Distilled water is:

Distilled water is:

• A. Water with minerals
• B. Water that contains only water molecules and is a pure substance.
• C. Water with dissolved gases
• D. Water with impurities

Answer: (B)

Distilled water is purified to remove dissolved minerals and other impurities, so the liquid that results is essentially only H2O molecules. This means it has a definite, single composition, classifying it as a pure substance. The distillation process—boiling water to remove volatile contaminants and then condensing the steam back to liquid—explains why minerals and impurities are largely absent, leaving water with minimal added substances. While distilled water can gradually pick up trace gases from the air, its defining feature is that it is composed mainly of water molecules rather than minerals, dissolved gases, or impurities.

Distilled water is purified to remove dissolved minerals and other impurities, so the liquid that results is essentially only H2O molecules. This means it has a definite, single composition, classifying it as a pure substance. The distillation process—boiling water to remove volatile contaminants and then condensing the steam back to liquid—explains why minerals and impurities are largely absent, leaving water with minimal added substances. While distilled water can gradually pick up trace gases from the air, its defining feature is that it is composed mainly of water molecules rather than minerals, dissolved gases, or impurities.