Write the Lewis structure for each molecule. a. $NF_3$ b. $HBr$ c. $SBr_2$, d $CCl_4$

Write the Lewis structure for each molecule. a. $CH_2O$ b. $C_2Cl_4$ c. $CH_3NH_2$ d. $CFCI_3$ (C central)

Draw the Lewis structure for each molecule. HCl

Write Lewis structures for each molecule or ion. Use expanded octets as necessary. a. $CIF_5$ b. $AsF_6 ^-$ c. $Cl_3PO$ d. $IF_5$

Draw the Lewis structure for each molecule. $\mathrm{PH}_{3}$

Write Lewis structures for each molecule or ion. Use expanded octets as necessary. a. $PF_5$ b. $I_3 ^-$ c. $SF_4$ d. $GeF_4$

Draw the Lewis structures for each of the following ions or molecules. Identify those in which the octet rule is not obeyed; state which atom in each compound does not follow the octet rule; and state, for those atoms, how many electrons surround these atoms:

$$PH_3$$

Complete each statement by writing the correct word or words. The ____ produced by crop plants such as wheat, rice, and corn are the source of most of the food humans eat.

Arrange these compounds in order of increasing magnitude of lattice energy: KC!, SrO, RbBr, CaO.

Write the Lewis symbols for the ions in each ionic compound. a . SrO b. Li$_2$S c. Cal$_2$ d. RbF

Write the electron configuration for Ne. Then write the Lewis symbol for Ne and show which electrons from the electron configuration are included in the Lewis symbol.

Use the Born-Haber cycle and data from Appendix IVB and Table $10.3$ to calculate the lattice energy of $\mathrm{CaO}$. $\left(\Delta H_{\text {sub }}\right.$ for calcium is $178 \mathrm{~kJ} / \mathrm{mol}$; $\mathrm{IE}_1$ and $\mathrm{IE}_2$ for calcium are $590 \mathrm{~kJ} / \mathrm{mol}$ and $1145 \mathrm{~kJ} / \mathrm{mol}$, respectively; $\mathrm{EA}_1$ and $\mathrm{EA}_2$ for $\mathrm{O}$ are $-141 \mathrm{~kJ} / \mathrm{mol}$ and $744 \mathrm{~kJ} / \mathrm{mol}$, respectively.)

Describe geometrically what happens to a point z when it is carried into f(z) by the following special Mobius transformations: (a) $f(z)=z+b$ (Translation). (b) $f(z)=a z$, where $a>0$ (Stretching or contraction). (c) $f(z)=e^{i \alpha} z$ where $\alpha$ is real (Rotation). (d) $f(z)=1 / z$ (Inversion).

¿Cuáles son las formas correctas de las palabras (los verbos en el presente) en paréntesis que completen la pregunta y la respuesta? ¿Tus amigos ____ (tener) una computadora en casa? No, ellos no ____ (tener) una computadora en casa.