Examples of index fossils. Index fossils (also known as guide fossils, indicator fossils or zone fossils) are fossils used to define and identify geologic periods (or faunal stages).
Methyl cellulose. Methyl cellulose (or methylcellulose) is a chemical compound derived from cellulose. It is a hydrophilic white powder in pure form and dissolves in cold (but not in hot) water, forming a clear viscous solution or gel.
Dec 8, 2015. Alkanes are not soluble in water. Alkanes are hydrocarbons that aren't very reactive, and are colorless and odorless. They are insoluble in water because the Van Der Waal forces between alkanes and water molecules do not release as much energy as it takes to dissolve hydrogen ions, therefore alkanes don't dissolve in water.