1. Calcium fluoride (fluorspar or fluorite) is a partially

soluble ionic compound used in metallurgy, particularly

in aluminum and steel production. When placed in

water, the solid is in equilibrium with its ions.

a. Write a balanced equation to show this

equilibrium.

b. What happens to the position of equilibrium if

soluble calcium chloride is added to the solution

of calcium fluoride?

C. What will happen to the equilibrium concentration

of F- when calcium chloride is added?

The allotropes of carbon include a variety of structures that include three-dimensional tetrahedral lattices, planes of hexagonal rings, cylindrical tubes of hexagonal rings, and spheres of five- and six-membered rings. similar shapes of network covalent atomic solids are possible with carbon nitride, boron, and pure silicon (e. g., silicene is a graphene-like allotrope of pure silicon). in contrast, silicates exist as either highly ordered or amorphous (more random) three-dimensional lattices. what could explain why there are there no naturally occurring sheets, stacked sheets, cylindrical tubes, or spheres of network covalent atomic solids composed of silicon and oxygen (sio2)? would pure silicate structures make good lubricants or good electrical conductors?