Question

Page Chemistry 107 Midterm II Review Problems Draw a Lewis structure for CaHN (think over the bonding preferences of each atom when you lay out the skeleton of this molecule!) 1. CC Determine the geometry at each "central atom" (a) Does this molecule have any polar bonds? Is the entire molecule polar? (b) What will be the dominant intermolecular force in a sample of this compound? (c) (c) If you had 100.0 g of this compound, how many moles would you have? how many molecules? Pictured below are two amino acids, phenylalanine and threonine. O 2. он Hас он OH NH2 threonine NH2 phenylalanine Identify all functional groups in each amino acid (a) What is the geometry of the right-most carbon in each structure? (b) Put a star next to any chiral carbons. What geometry to they all have? (c) Which of these molecules is likely to be more water-soluble? Explain why. (d) MacBook Pro

Answer 1

I- H-C e = Acetonitrile (H₂N) Bouding takes place such that every atom has the complete octet. The carbon haring 3-H is sp² hybrid and hence acquire tetrahedral shape. The other carbon and nitrogen are bonded by spe hybrid orbital and hence acquire linear shake. The molecule can be seen as: COMMINILIILIA insps . sp H:13 CSÑ -CEN , bond is polar because of difference in electronegativity of carbon and nitrogen. Due to wigh electronegativity of nitrogen, it acquires a partial are charge and came to charge on carbon atom. - + = N * (+5 - Dipole. Due to formation of a dipole in the given molecules dipole-dipole interaction takes place. 48 -.....3 ....t .....to - Molar wars ay compound = 2x12 +3X1 + 14 = 499/mat mars = 10o ay not = 2144 moles 1 molarmars - I wole = 6:023X1023 molecules .: 100g comperene! = 2.44 mole = 2.44X6023X1023= 14.7 x 104 Solec oles ² may