Use the bond dissociation enthalpy data in the table to calculate $\Delta H^{\circ}$ for (a) the monofluorination and (b) the monoiodination of methane. What is the main reason the values are so different?

Which bond would you expect to be the most polar?

O C-0

O N-C

O C-F

O N-O

O P-C

Draw a Lewis structure for $\ce{SO2}$ in which all atoms have a formal charge of zero.

draw a lewis structure for so2 in which all atoms obey the octet rule

Choose a likely identity for X, Y, and Z in these structures:

i. $\ce{Be}$

ii. $\ce{F}$

iii. $\ce{C}$

iv. $\ce{O}$

v. $\ce{N}$

vi. $\ce{B}$

Draw Lewis structures showing all valence electrons for these molecules. HCN

Draw the Lewis dot structures for each of the following molecule: HCN

Draw the Lewis structure of CO. Include lone pairs and formal charges.

Draw a Lewis structure for a resonance form of each ion with the lowest possible formal charges. show the charges, and give oxidation numbers of the atoms:

SO32-.

Which of the following molecules and polyatomic ions cannot be adequately described using a single Lewis structure?

a. OF$_2$

b. NH$_4^+$

c. O$_3$

d. COH$_2$

e. CO$_3^{2-}$

f. HCN

A 3.27-m^3 tank contains 100 kg of nitrogen at 175 K. Determine the pressure in the tank using (a) the ideal-gas equation, (b) the van der Waals equation, and (c) the Beattie-Bridgeman equation. Compare your results with the actual value of 1505 kPa.

Determine the specific volume of nitrogen gas at 10 MPa and 150 K based on (a) the ideal-gas equation, (b) the generalized compressibility chart. Compare these results with the experimental value of 0.002388 m^3/kg, and determine the error involved in each case. Answers: (a) 0.004453 m^3/kg, 85.4 percent, (b) 0.002404 m^3/kg, 0.7 percent

Suppose that the population dynamics of a species obeys a modified version of the logistic differential equation having the following form: $\frac{d N}{d t}=r\left(1-\frac{N}{K}\right)^{2} N$ where $r \neq 0 \text { and } K>0$ Apply the local stability criterion to the equilibrium $\hat{N}=K.$ What do you think your answer means about the stability of this equilibrium?

How many outer atoms and lone pairs are present in a molecule with a see-saw shape?