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CH101-Assignment 14

CH101-Assignment 14 - 1 Consult the NaCl unit cell in...

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1. Consult the NaCl unit cell in Figure 8.14 and the data in Table 8.3 to answer the following questions. a) Along which line do the ions touch? edge face diagonal b) What is the length of an edge of the unit cell in Angstroms? (Hint : don't forget how a unit cell is defined!) Be sure to enter your number at least two places past the decimal point.5.66 A c) How many chloride ions are in the unit cell? 4 d) How many sodium ions are in the unit cell? (Hint : don't forget the chemical formula) 4 2. In the structure of -crystobalite shown in Figure 8.21 of the textbook, how many Si atoms are in the unit cell? 8 How many O atoms are in the unit cell? 16 3. Based on the observed melting point for each of the following silicon containing species, decide whether they are molecular or (network) covalent solids. SiC; m.p. ~ 2700 o C covalent molecular SiH 4 ; m.p. ~ -185 o C molecular covalent SiO 2 ; m.p. ~ 1700 o C covalent molecular Si(CNS) 4 ; m.p. ~ 140 o C covalent molecular SiSBr 2 ; m.p. ~ 90 o C
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molecular covalent Si 3 N 4 ; m.p. ~ 1900 o C covalent molecular 4. Consider the following pairs of substances:
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