Question

2. Using the directions from your notes or book, draw a Lewis Structure for the following compounds on separate sheets of paper. Show calculations of valence electrons. O2, SO2, HONO (N in the middle), SiH. CI.CO (C in center). C H, NH.. NO, PO Describe 2 exceptions to the octet rule. What are resonance structures? 3. What does VSEPR stand for? How can it be used to predict the geometry of a molecule? Give the electron and molecular geometry for the Lewis structures drawn above. 4. What is electronegativity? Explain the basic trend of the values. What are the 3 types of bonds and how are the electronegativity values used to predict the type of bond? Explain how a molecule can he polar bonds yet be overall non-polar? 5. Using the electronegativity values from the text, determine if the molecules in question 2 above are polar or non-polar. 6. How does the concept of polarity explain why oil and water don't mix 7. Explain how soap works to remove oils

Answer 1

2 leaves structures : | 02 (@=9] = 0:0;/; 50962) = 0:32:00); HONO(40-45) = forbe 2307 H CH

24 Calculation of Valence eletron: - 02 0 18 25 24 vorbital Movie One onggen = 6 valence electron .: 6x2 = 12 Valence electron for 02 102 Valence eletrone of 'S?= 6 Tefal valence electron = 6+6X2 = 18 - valence onbital eletron HONO Valence electrons of N=5 broe N15 ²25 23 Noble esmen for Hydrogen Contains valence electron os Tefal Valence electrons of HONO = 1+67546 = 18 Sittu valenca electrons of si=4 C e for "H² = 1 : Total Valence electrons of sitte = 4 +1x4 =8 dzco Valenca elctrons of l = 7 . & fog 'C' = 4 4 for 8 = 6 .:78fal valence eletrons of claca = 7X24 4+6=24

27 C H 4 valenca electron of c = 4 & for H²=1 • Tfal Valence eletrong = 4%2+144= 12 NiHy Valence eletrone of viss e No - 5-1= 4 As the charge is considered on central atom. 3 Tofal valence electrons of wat 4*1*4 = 8 NO3 As -ve change is considered one central atom. So Valence electron of 'N = 6 (541) in Tefal Valence electron of No = 6+6X93 = 24 POL valence electron of writt-ve change = 65+3=8 & Tofal valence eletrons of Pon = 8 + 6x4 Actually valence electron of p_, mee election of pe=5 but nz is. also considered during counting of total stolence eletron.So don't be confused.

2) Taro exceptions eto odley rule : - (1) Stable moicules having less than eight electrons - such as Beelz & Belze ! :d – Be- ¿: Auto (4 es anaand Bed & di (688 Anand Boron) GN stable molecule having more than eight electrons such as Sf (12 Es around Suffer) Resonance structures: - Resonance sfrueterose io e hypothetical canonical form of an ion of molecule which describes a bonding in that ron stimdicule by combination of several contributing structure having their equivalent energy. As shown OG)