Final answer:
Chemical admixtures are categorized under an ASTM designation, which wasn't provided. Substances can be classified as atomic elements, molecular elements, molecular compounds, or ionic compounds, based on their composition and bonding.
Step-by-step explanation:
As per the question, all chemical admixtures fall under a specific ASTM designation. However, the ASTM designation is not provided in the question. For the purpose of classification, each substance can be categorized as an atomic element, a molecular element, a molecular compound, or an ionic compound.
An atomic element consists of single atoms of one element. Helium (He) is an example of an atomic element as it exists as individual atoms. A molecular element is made up of two or more atoms of the same element bonded together. Oxygen (O₂) is an example of a molecular element as it consists of two oxygen atoms bonded together. A molecular compound consists of two or more different elements bonded together. Water (H₂O) is an example of a molecular compound. Lastly, an ionic compound is composed of charged particles called ions, which are typically formed by the transfer of electrons from metals to non-metals. Sodium chloride (NaCl) is an example of an ionic compound.