Consider the following data for silicon: g 28.085 mol atomic mass electronegativity 1.90 kJ 133.6 mol electron affinity kJ 786.5 mol ionization energy kJ 50.2 mol heat of fusion You may find additional useful data in the ALEKS Data tab. Does the following reaction absorb or release energy? release absorb (1) Si (g) → Si' (g) + e Can't be decided with the data given. yes Is it possible to calculate the amount of energy absorbed or released by reaction (1) using only the data above? no If you answered yes to the previous question, enter the amount of energy absorbed or released by reaction (1): OkJ/ mol Does the following reaction absorb or release energy? release absorb (2) Si (g) Si (g) + e Can't be decided with the data given. yes Is it possible to calculate the amount of energy absorbed or released by reaction (2) using only the data above? no If you answered yes to the previous question, enter the amount of energy absorbed or released by reaction (2): O kJ/mol

Consider the following data for silicon: g 28.085 mol atomic mass electronegativity 1.90 kJ 133.6 mol electron affinity kJ 786.5 mol ionization energy kJ 50.2 mol heat of fusion You may find additional useful data in the ALEKS Data tab. Does the following reaction absorb or release energy? release absorb (1) Si (g) → Si' (g) + e Can't be decided with the data given. yes Is it possible to calculate the amount of energy absorbed or released by reaction (1) using only the data above? no If you answered yes to the previous question, enter the amount of energy absorbed or released by reaction (1): OkJ/ mol Does the following reaction absorb or release energy? release absorb (2) Si (g) Si (g) + e Can't be decided with the data given. yes Is it possible to calculate the amount of energy absorbed or released by reaction (2) using only the data above? no If you answered yes to the previous question, enter the amount of energy absorbed or released by reaction (2): O kJ/mol

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter7: Chemical Bonding And Molecular Structure

Section: Chapter Questions

Problem 7.21PAE: 7.21 Theoretical models for the structure of atomic nuclei predict the existence of superheavy...

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7.21 Theoretical models for the structure of atomic nuclei predict the existence of superheavy elements that have not yet been discovered and suggest that such elements might be fairly stable if they could be produced. So researchers are currently trying to synthesize these superheavy elements to test these theories. Element 117 has been synthesized and named Tennessine (Ts). What would the Lewis dot symbol be for this new element?
Of the five elements Sn, Si, Sb, O, Te, which has the most endothermic reaction? (E represents an atom.) What name is given to the energy for the reaction? E(g)E+(g)+e
At large interatomic separations, an alkali halide molecule MX has a lower energy as two neutral atoms, M+X ; at short separations, the ionic form (M+)(X) has a lower energy. At a certain distance, Rc , the energies of the two forms become equal, and it is near this distance that the electron will jump from the metal to the halogen atom during a collision. Because the forces between neutral atoms are weak at large distances, a reasonably good approximation can be made by ignoring any variation in potential V(R) for the neutral atoms between Rc and R= . For the ions in this distance range, Rc is dominated by their Coulomb attraction. (a) Express Rc for the first ionization energy of the metal M and the electron affinity of the halogen X. (b) Calculate Rc for LiF, KBr, and NaCl using data fromAppendix F.
Using data from Chapter 2, calculate the change in energy expected for each of the following processes. a. Na(g)+Cl(g)Na+(g)+Cl(g) b. Mg(g)+F(g)Mg+(g)+F(g) c. Mg+(g)+F(g)Mg2+(g)+F(g). d. Mg(g)+2F(g)Mg2+(g)+2F(g)
The compound hexaazaisowurtzitane is one of the highest-energy explosives known (C E News, Jan. 17, 1994, p. 26). The compound, also known as CL-20, was first synthesized in 1987. The method of synthesis and detailed performance data are still classified because of CL-20s potential military application in rocket boosters and in warheads of smart weapons. The structure of CL-20 is In such shorthand structures, each point where lines meet represents a carbon atom. In addition, the hydrogens attached to the carbon atoms are omitted; each of the six carbon atoms has one hydrogen atom attached. Finally, assume that the two O atoms in the NO2 groups are attached to N with one single bond and one double bond. Three possible reactions for the explosive decomposition ofCL-20 are i. C6H6N12O12(s)6CO(g)+6N2(g)+3H2O(g)+32O2(g) ii. C6H6N12O12(s) 3CO(g) + 3CO2(g) + 6N2(g) + 3H2O(g) iii. C6H6N12O12(s) 6CO2(g) + 6N2(g) + 3H2 (g) a. Use bond energies to estimate E for these three reactions. b. Which of the above reactions releases the largest amount of energy per kilogram of CL-20?
Consider the following data for sulfur: atomic mass 32.066 g/mol electronegativity 2.58 electron affinity 200.4 kJ/mol ionization energy 999.6 kJ/mol heat of fusion 1.73 kJ/mol Does the following reaction absorb or release energy? (1) S+(g)+ e- -> S(g) Is it possible to calculate the amount of energy absorbedor released by reaction (1) using only the data above? If you answered yes to the previous question, enter theamount of energy absorbed or released by reaction (1): Does the following reaction absorb or release energy? (2) S(g) + e- -> S-(g) Is it possible to calculate the amount of energy absorbedor released by reaction (2) using only the data above? If you answered yes to the previous question, enter theamount of energy absorbed or released by reaction (2):
Consider the following data for ruthenium: atomic mass 101.07 g/mol electronegativity 2.20 electron affinity 101.3 kJ/mol ionization energy 710.2 kJ/mol heat of fusion 25.7 kJ/mol Does the following reaction absorb or release energy? (1) Ru+(g) +e− -> Ru(g) Is it possible to calculate the amount of energy absorbedor released by reaction (1) using only the data above? If you answered yes to the previous question, enter theamount of energy absorbed or released by reaction (1): Does the following reaction absorb or release energy? (2) Ru−(g) -> Ru(g) + e− Is it possible to calculate the amount of energy absorbedor released by reaction (2) using only the data above? If you answered yes to the previous question, enter theamount of energy absorbed or released by reaction (2)
Consider the following data for silver: atomic mass 107.87 g/mol electronegativity 1.93 electron affinity 125.6 kJ/mol ionization energy 731.0 kJ/mol heat of fusion 11.3 kJ/mol Does the following reaction absorb or release energy? (1) Ag(g) -> Ag+(g) + e- Is it possible to calculate the amount of energy absorbedor released by reaction (1) using only the data above? If you answered yes to the previous question, enter theamount of energy absorbed or released by reaction (1): Does the following reaction absorb or release energy? (2) Ag- (g) -> Ag(g) + e- Is it possible to calculate the amount of energy absorbedor released by reaction (2) using only the data above? If you answered yes to the previous question, enter theamount of energy absorbed or released by reaction (2):
Magnesium is an important element in the human body,especially in bones. Magnesium’s atomic number is 12. Isit stable or reactive? Why? If it were to react with anotheratom, would it be more likely to accept or to donate one ormore electrons?
Potassium and hydrogen react to form the ionic compoundpotassium hydride. (a) Write a balanced equation for thisreaction. (b) Use data in Figures 7.10 and 7.12 to determinethe energy change in kJ/mol for the following two reactions:K(g) + H(g) ----> K+(g) + H-(g)K(g) + H(g) ------>K-(g) + H+(g)(c) Based on your calculated energy changes in (b), which ofthese reactions is energetically more favorable (or less unfavorable)?(d) Is your answer to (c) consistent with the descriptionof potassium hydride as containing hydride ions?
In the chemical process called electron transfer, an electron istransferred from one atom or molecule to another. A simpleelectron transfer reaction isA(g) + A(g)---->A+(g) + A-(g) In terms of the ionization energy and electron affinity ofatom A, what is the energy change for this reaction? For arepresentative nonmetal such as chlorine, is this process exothermic?For a representative metal such as sodium, is thisprocess exothermic?
The first ionization energy of the oxygen molecule is the energyrequired for the following process:O2(g)---->O2 +(g) + e-The energy needed for this process is 1175 kJ/mol, very similarto the first ionization energy of Xe. Would you expect O2 to reactwith F2? If so, suggest a product or products of this reaction.