Identify the correct dipole for the C-O bond in the Lewis structure of acetone shown using the symbols δ⁺ and δ⁻.   A (δ⁺)C – O(δ⁺) B (δ⁻)C – O(δ⁺) C (δ⁻)C – O(δ⁻) D (δ⁺)C – O(δ⁻)

Using the BDE values from Appendix 3, calculate the Hrxn0 value and state if the reaction below is exothermic or endothermic. CH2=CH2 + HCl CH3CH2Cl

The heat of neutralization, Hneut, can be defined as the amount of heat released (or absorbed), q, per mole of acid (or base) neutralized. Hneut for nitric acid is -52 kJ/mol HNO3. At 27.3C, 50.00 mL of 0.743M HNO3 is neutralized by 1.00 M Sr(OH)2 in a coffee-cup calorimeter. (a) How many mL of Sr(OH)2 were used in the neutralization? (b) What is the final temperature of the resulting solution? (Use the assumptions in Question 11.)

Use a Born-Haber Cycle to calculate the missing ∆H (bold reaction) of the following:     Be(g) yields  Be2+(g) + 2 e–                                   ∆H= +2660 kJ/mole              Be(s)  yields  Be(g)                                                ∆H= +302 kJ/mole              1/2 I2(s)  yields  I(g)                                             ∆H= +107 kJ/mole             I(g) + e–   yields   I–(g)                                            ∆H= –295 kJ/mole            Be2+(g) + 2 I–(g) yields   BeI2(s)                        ∆H= ?                    Be(s) + I2(s) yields  BeI2(s)                      ∆H= –208 kJ/mole BeI2