Final answer:
Acidic, basic, or neutral classifications apply to pH values of substances, with acidic being below 7, basic above 7, and neutral exactly at 7. Molecular structures, chemical reactions, and atomic masses are not classified in this manner as they relate to different chemical concepts.
Step-by-step explanation:
The student's question involves classifying substances based on pH values, molecular structures, chemical reactions, and atomic masses. When classifying substances based on pH values, these substances can be acidic, basic, or neutral:
- Acidic: Substances with a pH value less than 7 are considered acidic.
- Basic (also known as Alkaline): Substances with a pH value greater than 7 are considered basic.
- Neutral: A substance with a pH value of 7 is considered neutral (pure water is an example).
Molecular structures, chemical reactions, and atomic masses, however, are not classified as acidic, basic, or neutral. These terms are not appropriate for those concepts:
- Molecular structures describe the arrangement of atoms within a molecule but do not determine the pH of the substance.
- Chemical reactions involve the transformation of substances and can either produce or involve acidic or basic substances, but the reactions themselves are not classified by pH.
- Atomic masses refer to the mass of an individual atom, measured in atomic mass units (amu), and has no relation to the substance's pH level.