Questions: 1. Calculate the % for ionic bonding: Sic; Electronegativity of Si= 1.8; C = 2.5. 2. Calculate the % for ionic bonding: SiO2; Electronegativity of Si= 1.8; 0 = 3.5. 3. A stable ionic crystal structure, the net charge is 4a. Calculate the Rcation/Ranion ratio of Nal. 4b. Based on this ratio, what is the structure of Nal. 5a. Calculate the Rcation/Ranion ratio of NiO. 5b. Based on this ratio, what is the structure of NiO. 6. A disadvantage of ceramic automotive engine parts: 7. Refractories ceramic are used specifically for applica- tions. Answer Options: 1) NaCl structure. 2) CsCl structure; 3) ZnS structure; 4) Wurtzite structure; 5) Fluorite structure; 6) Antifluorite structure; 7) NiAs structure; 8) Corundum structure; 9) Cannot handle high temperatures; 10) Difficult to machine; 1 1) Easy to machine; 12) Low temperature; 13) High temperature; 14) Chemical