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.
+ Ni(OH)2 is insoluble because all hydroxides are insoluble EXCEPT those of ammonium, barium and alkali metal (Group I) cations. + BaSO4 is insoluble because all sulfates are soluble EXCEPT those of silver, lead, mercury(I), barium, strontium and calcium.E: Compounds soluble in water? Which of the following compounds is soluble in water? -Ni(OH)2 -K3PO4 -BaSO4 -CoCO3 -PbCl2 And could you explain how to tell.