Indietro
Problema 3.46
Arrange these compounds in order of increasing magnitude of lattice energy: KCl, SrO, RbBr, CaO.
- Use covalent Lewis structures to explain why the compound that forms between nitrogen and hydrogen has the formula NH3 and why NH2 and NH4 are not stable.
Problema 5
Problema 35
Write the electron configuration for N. Then write the Lewis symbol for N and show which electrons from the electron configuration are included in the Lewis symbol.
Problema 37a,c
Write the Lewis symbol for each atom or ion. a. Al c. Cl
Problema 37b
Write the Lewis symbol for each atom or ion. b. Na+
Problema 37d
Write the Lewis symbol for each atom or ion. d. Cl-
Problema 39d
Write the Lewis symbols for the ions in each ionic compound. d. K2O
Problema 40a,d
Write the Lewis symbols for the ions in each ionic compound. a. SrO d. RbF
Problema 40b
Write the Lewis symbols for the ions in each ionic compound. b. Li2S
Problema 40c
Write the Lewis symbols for the ions in each ionic compound. c. CaI2
Problema 41
Use Lewis symbols to determine the formula for the compound that forms between each pair of elements. a. Sr and Se b. Ba and Cl c. Na and S d. Al and O
Problema 42
Use Lewis symbols to determine the formula for the compound that forms between each pair of elements. a. Ca and N b. Mg and I c. Ca and S d. Cs and F
Problema 44
Rubidium iodide has a lattice energy of -617 kJ/mol, while potassium bromide has a lattice energy of -671 kJ/mol. Why is the lattice energy of potassium bromide more exothermic than the lattice energy of rubidium iodide?
Problema 45
The lattice energy of CsF is -744 kJ/mol, whereas that of BaO is -3029 kJ/mol. Explain this large difference in lattice energy.
Problema 47
Use the Born–Haber cycle and data from Appendix IIB, Chapter 9 and this chapter to calculate the lattice energy of KCl. (ΔHsub for potassium is 89.0 kJ>mol.)
Problema 48
Use the Born–Haber cycle and data from Appendix IIB and Table 10.3 to calculate the lattice energy of CaO. (ΔHsub for calcium is 178 kJ>mol; IE1 and IE2 for calcium are 590 kJ>mol and 1145 kJ>mol, respectively; EA1 and EA2 for O are -141 kJ>mol and 744 kJ>mol, respectively.)
- Use covalent Lewis structures to explain why each element or family of elements occurs as diatomic molecules: a. hydrogen b. the halogens c. oxygen d. nitrogen.
Problema 49
Problema 51a,b,c
Write the Lewis structure for each molecule. a. PH3 b. SCl2 c. HI
Problema 51d
Write the Lewis structure for each molecule. d. CH4
Problema 53a
Write the Lewis structure for each molecule. a. SF2
Problema 53b
Write the Lewis structure for each molecule. b. SiH4
Problema 53d
Write the Lewis structure for each molecule. d. CH3SH (C and S central)
Problema 54
Write the Lewis structure for each molecule. a. CH2O b. C2Cl4 c. CH3NH2 d. CFCl3 (C central)
Problema 55a
Determine if a bond between each pair of atoms would be pure covalent, polar covalent, or ionic. a. Br and Br
Problema 57
Refer to Figure 10.10 to estimate the percent ionic character of the CO bond.
Problema 58a
Draw the Lewis structure for BrF with an arrow representing the dipole moment. Refer to Figure 10.10 to estimate the percent ionic character of the BrF bond.
Problema 58b
Refer to Figure 10.10 to estimate the percent ionic character of the BrF bond.
Problema 60b
Write the Lewis structure for each molecule or ion. b. OH-
Problema 60c
Write the Lewis structure for each molecule or ion. c. BrO-
Problema 61d
Write the Lewis structure for each molecule or ion. d. C2H4