Answered: WO 2. While working on this activity… | bartleby

Chemistry: Matter and Change

Chemistry: Matter and Change

1st Edition

ISBN:9780078746376

Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Chapter6: The Periodic Table And Periodic Law

Section6.3: Periodic Trends

Problem 20SSC

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WO
2. While working on this activity you had to move
H reattaching it next to He, above F. There are
some periodic tables that have H in both
positions instead of only above Lithium. What
is the rationale behind placing H in both
positions?
-21-

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Identify the element that corresponds to each of the simplified photoelectron spectral data given below. (Energy data taken from D. A. Shirley, R. L. Martin, S. P. Kowalczyk. F. R. McFeely, and L Ley: Core-electron binding energies of the first thirty elements Physical Review B, Vol. 15, pp. 544-552, 1977.) (a) There are peaks at energies corresponding to 1079, 70.8, 38.0, 5.14 eV, corresponding to 2, 2, 6, and 1 electrons, respectively. (b) There are peaks at energies corresponding to 4043, 443, 351, 48.4, 30.1, and 6.11 eV, corresponding to 2, 2, 6, 2, 6, and 2 electrons, respectively. (c) There are peaks at energies corresponding to 5475, 638, 524, 77, 47, 12. and 7.3 eV, corresponding to 2, 2, 6, 2, 6, 3, and 2 electrons, respectively.
(a) Account for formation of the following series of oxidesin terms of the electron configurations of the elementsand the discussion of ionic K2O, CaO, Sc2O3, TiO2, V2O5, CrO3. (b) Name these oxides.(c) Consider the metal oxides whose enthalpies of formation(in kJ mol -1) are listed here. Calculate the enthalpy changes in the following general reactionfor each case:MnOm(s) + H2(g)----->nM(s) + mH2O(g)(You will need to write the balanced equation for each caseand then compute ΔH°.) (d) Based on the data given, estimatea value of ΔHf° for Sc2O3(s).
(a)The radius of Cd2+ is smaller than that of Sn2+. Calculate the Zeff for the outer mostorbital for each atom and each ion. Calculate the Zeff for 3s orbital for each atom. Givea rational explanation.(b) List all the key aspects that has to be taken into account for choosing a coating metaland also the key aspects determining the quality of coating.(c) Explain rust. When 0.1 kg of iron is totally rusted, how much rust will be producedfrom it? It is known that water filled steel containers gets corroded below the load line,why?
What is the valence electron configu.ration for Group SA (lS) elements?Metallic character increases when going down a group. Give some examples illustrating how Bi and Sbhave metallic characteristics not associated with N, P,and As. Elemental nitrogen exists as N2 whereas in the gas phase the elements phosphorus, arsenic, and antimony consist of P4' As4, and Sb4 molecules, respectively.Give a possible reason for" this difference between N2 and the other Group SA (lS) elements. White phosphorus is much more reactive than black or red phosphorus. Explain.
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(a) If the core electrons were totally effective at screeningthe valence electrons and the valence electrons providedno screening for each other, what would be the effectivenuclear charge acting on the 3s and 3p valence electronsin P? (b) Repeat these calculations using Slater’s rules. (c)Detailed calculations indicate that the effective nuclearcharge is 5.6+ for the 3s electrons and 4.9+ for the 3pelectrons. Why are the values for the 3s and 3p electronsdifferent? (d) If you remove a single electron from a P atom,which orbital will it come from?
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