Please mark the right answers clearly. iPad 12:18 AM * 28%. Please turn in your

Question

Please mark the right answers clearly. iPad 12:18 AM * 28%. Please turn in your answers on the scantron sheet no later than Wednesday, Nov 22, lam. (scantrons can be picked up in class or in Joanna Plotrowska's office) 1.Which of the following ionic solids would have the largest lattice energy? A) KF B) KI C) LiF D) Lil E) NaF 2.Which of the following solids would have the highest melting point? A) Nal B) NaF C) MgO D) MgCl E) KF 3. Which one of the following is most likely to be a covalent compound? 4.Arrange the elements Ba, Br, and Ga in order of increasing electronegativity C) Ba

Explanation / Answer

1. lattice energy is inversely proportional to sum of radius of cation and anion
     C. LiF
2. C. MgO
3. D.SeO2
4. C. Ba<Ga<Br
5. E. P-Cl
6. A.0
7. B.2
8. C.0
9. A.-2
10.2C2H2 + 5O2---------> 4Co2 + 2H2O
    2(H-C=C-H) + 5(O=O) - (4(O=C=O) + 2(H-O-H)
DH = 4(C-H) + 2(C=C)+ 5(O=O) - [8(O=C) + 4(O-H)]
       = (4*456+2*962+5*499)-(8*802+4*462)
       = 6243-8264 = -2021KJ/mole
DH    = -1010 per mole
   D.D
11.B False
12. A.PBr3
13.B.1lone pair, seesaw
14.D. 120 and 90
15.Sp^3
16.C Sp^3
17.c.3
18.B.C2H5F
19. A. true

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