[填空题]
Two common minerals found in sedimentary rocks are calcite and quartz.
1.Calcite has the molecular formula $CaCO_3$ and contains the anion X.
1.1.State the name of anion X; X is .
1.2.Draw the Lewis structure of anion X. including all atomic charges and bonding and non-bonding electron pairs.
1.3.The molecular geometry of anion X is .
1.4.Suggest why the bond angles of anion X are all exactly equal.The bond angles are $^{\circ}$.
2.Quartz has the molecular formula $SiO_2$
2.1.Explain why the bonding in quartz differs from that in calcite based on the electronegativities given in section 8 (Section 9- 2025 Syllabus) of the data booklet.
2.2.Both calcite and quartz can be melted. Explain the electrical conductivities of the two materials after they are melted.
are all exactly equal.
