According to Mohs hardness scale, which of these groups of minerals can scratch fluorite? Calcite, quartz, and topaz

Diamond, gypsum, and quartz

Apatite, feldspar, and corundum

Talc, gypsum, and calcite

Summarize possible ways in which phases of matter could combine to form a solution.

Many free radicals combine to form molecules that do not contain any unpaired electrons. the driving force for the radical–radical combination reaction is the formation of a new electron‑pair bond. consider the chemical equation. n(g)+no(g)⟶nno(g) n(g)+no(g)⟶nno(g) write lewis formulas for the reactant and product species in the chemical equation. include nonbonding electrons. n(g)n(g) select draw rings more erase select draw rings more erase select draw rings more erase n no(g)

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.