Perfect tetrahedral 2 perfect pyramidal 3 two extra

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* Perfect Tetrahedral 2. Perfect Pyramidal 3. Two extra pair of electrons Square Planar 4. Perfect Trigonal Bipyramidal 5. One double bond Trigonal Planar 6. One extra pair of electrons T-shaped 7. Two double bonds Linear 8. One extra pair of electrons See-Saw
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Electronegativity- The ability of an atom to attract the shared pair of electrons in a chemical bond. Generally speaking, if the difference in the electronegativity values between two elements forming a chemical bond is greater than 1.7, the bond will be ionic. If it is less than 1.7 the bond will be covalent. 15
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Review Chapter 7 1. How many valence electrons in (a) Cl (b) Mg (c) Fe 2. Draw the Lewis Dot symbol for (a) O (b) N 3. When the following react, do they form cations or anions. What charge will each ion be? (a) Na (b) F (c) Ca (d) S 4. How many p, n, and e in (a) Al 3+ (b) O 2- 5. In the Lewis Dot Drawing for the following, how many lone pair of electrons are on the central atom? (a) H 2 O (b) XeF 4 (c) NH 3 6. Write the correct formula for the combination of each. (a) Fe 3+ and O (b) Al and Cl (c) Ba and NO 3 - (d) Ca and CO 3 2- 7. Do the following form ionic or covalent bonds? (a) KF (b) HF (c) AlCl 3 (d) NaI (e) K 2 O (f) CO 8. Give one example of a 100% covalent bond, a polar covalent bond, and an ionic bond. 9. Which of the compounds contains the most polar bonds? (a) HF or HCl (b) CO or NO (c) CO 2 or SiO 2 (p 235) 10. Draw Lewis Dot structures for the following: (a) PH 3 (b) ICl 3 (c) IF 5 (d) XeF 4 (e) SeO 2 11. For each compound in number 10 tell: (a) molecular geometry (b) How many unbonded pair of electrons on the central atom? 12. Define electronegativity. 13. In a polar covalent bond, one atom has a partial negative charge. In the following compounds, which element has the partial negative charge? [ see electronegativity table on page 235 if necessary] 14. What do the letters VSEPR stand for? 15. Draw all the possible resonance structures for: 16. How many electrons around the central atom in: (a) H 2 O (b) XeF 2 16
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Answers: 1. (a) 7 (b) 2 (c) 2 2. (a) O with six dots (b) N with five dots 3. (a) Na cation 1+ (b) F anion 1- (c) Ca cation 2+ (d) S anion 2- 4. (a) Al 3+ p- 13 n- 14 e- 10 (b) O 2- p-8 n-8 e-10 5. (a) 2 (b) 2 (c) 1 6. Fe 2 O 3 (b) AlCl 3 (c) Ba(NO 3 ) 2 (d) CaCO 3 7. (a) I (b) C (c) I (d) I (e) I (f) C 8. (a) H 2 (b) HCl (c) NaCl 9. (a) HF (b) CO (c) SiO 2 10. (a) AX 3 E pyramidal (b) AX 3 E 2 T-shaped (c) AX 5 E square pyramid (d) AX 4 E 2 square planar (e) AX 2 E Bent 11. (a) see above for molecular geometry Unbonded electrons pair (a) 1 (b) 2 (c) 1 (d) 2 (e) 1
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