Create . The supplement contains passionflower, chamomile, lemon balm and hops, which have been clinically shown to naturally calm and relax the central nervous system. Videos and resources covering atoms, elements and compounds, pure and impure substances, the periodic table and chemical formulae. Table salt, for example, is composed of sodium and chlorine atoms ionically bound to each other. Dates: Modify . Phentanyl. Best-Rest Formula supports healthy sleep cycles by encouraging an easy transition to sleep and a restful night's sleep. DrBob1 . 2005-03-25 . H2O can have as good or better purity as any element. Relevance. The active ingredient 3-Methylfentanyl is a DEA Schedule I controlled substance. Fentora. ‡ Certified Gluten-Free by the Gluten-Free Certification Organization, www.gluten.org ‡ Details. 0 0 0. Matter can be divided into pure substance and mixture.Then pure substance can be divided into element and compound.So from this classification,we can say that a compound is a pure substance.In pure substance,the composition remains fixed.An element is formed by only one type of atoms or by atoms which have same atomic number.On the other hand,a compound is formed by more than one element. In fact, because many elements are radioactive, I would argue that it could be more pure. Lv 7. Molecular Formula: C 22 H 28 N 2 O: Synonyms: fentanyl. Login to reply the answers Post; Anonymous. Of course compounds can be pure. Answer Save. 8 years ago. formula that represents a substance that is a pure compound? 2020-11-15. A pure compound substance is one that is composed only of elemental equivalent atoms. 2 Answers. Fentanyl is a DEA controlled drug. A collection of content about atoms, elements and compounds, pure and impure substances, the periodic table and chemical formulae to support learning in Year 8/S2. Fentanil. 8 years ago. 437-38-7. More... Molecular Weight: 336.5 g/mol.