Rank the following in order of decreasing importance as contributing structures to the resonance hybrid of formaldehyde, H₂CO. :0: H.-H Multiple Choice I>> I>> >I> 111

Draw the Lewis Structure for each covalent system a-e below, and answer the question that follows: Electronegativites: H = 2.1 C = 2.5, B = 2.0N = 3.0, 0 = 3.5 S = 2.5, F = 4.0, Xe = 2.6 a. (OF 2 )Is this molecular POLAR or NONPOLAR? b. (XeF2) What is the geometry of this molecule? c. (SO 3 ^ 2- )What is the polyatomic ion geometry? (Assume "S" obeys octet) d.( CH 2 F 2 )Is this molecular POLAR or NONPOLAR? e.( BF 3 )Is this molecular POLAR NONPOLAR

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Determine the enthalpy of the following reaction CH3CH=CH2 + 4.50=0 ---> 30=C=O + 3H-O-H using the following bond enthalpy values: Bond Bond Energy C-C C=C C-H C=O 0=0 0-H 347 611 414 736 498 464 REMINDER: AH = E Ereactant bonds broken - I Eproduct bonds broken AH = -1517 kJ AH = - 7200 kJ None of these O AH = 1517 kJ AH = 5683 kJ %3D AH = 7200 kJ Ο ΔΗ-0