Answer:
b
Explanation:
A pure substance has a constant composition and cannot be separated into simpler substances by physical means. There are two types of pure substances: elements and compounds.
The element that has the fewest valence electrons available for bonding I believe is Hydrogen.
Obsidian - extrusive igneous
granite - clastic sedimentary
conglomerate - intrusive igneous
evaporite - chemical sedimentary
coal - organic sedimentary
marble - metamorphic
Answer:
adding an acidic solution
Explanation:
Strong acids dissociate completely in water and the H⁺ ions react with the OH⁻ ions to make H₂O. If we add an acid to our solution of Ca(OH)₂, the acid protons would react with some of the OH⁻ ions and drive the equilibrium to the right. More of the solid Ca(OH)₂ should dissolve.