CH 8 and 9 Quiz

Given the following bond energies, calculate the ∆Hrxn for this reaction. H-C≡C-H (g) + 2H2 (g) --> H3C-CH3 (g) bond energies: C-C 347; C≡C 839; C-H 413; H-H 432

-296 KJ

How many valence electrons in Mn (Z=25)?

7

How many electrons have the quantum number n=2?

8

In the element Si (z=14), how many electrons are in p orbitals?

8

Which of the following elements has the most metallic behavior? Sb, As, Bi, Te, Po

Bi

Why does P have a larger radius than Cl?

Cl has more protons but the same amount of shielding as P giving Cl a higher effective nuclear charge.

Which of the following is diamagnetic? Li, Fe 2+, Br, Co 3+, or Cu 1+

Cu 1+

Which of the following has the highest lattice energy? MgF2, Na2S, NaF, CaO, MgO

MgO

Which of the following is a covalent compound? Al2O3, Na2O, NO2, CsCl, or Na3N

NO2

Which of the following has the shortest bond? N≡N, N-N, N-O, N=N

N≡N

Identify the element of Period 2 which has the following successive ionization energies, in kJ/mol. IE (1) 1314 IE (2) 3389 IE (3) 5298 IE (4) 7471 IE (5) 10992 IE (6) 13329 IE (7) 71345 IE (8) 84087

O

Which of the following has the largest ionic radii? O 2-, Ca 2+, K +, S 2-, Cl -

S 2-

Which element has the electron configuration [Ar] 4s²3d¹⁰4p⁴? Cr, Sn, Se, S or Te

Se

Given the following electronegativities, which of the following is the most polar bond? F-4.0, Cl-3.0, O-3.5, C-2.5, I-2.5, Si-1.8 Cl-F, Si-F, C-I, C-O, C-F

Si-F

What is the electron configuration for Cr 2+

[Ar] 3d4

Describe oxygen's electron affinity and ionization energy.

high negative electron affinity, high ionization energy

What are the 4 quantum numbers for the indicated electron? (the first in 2p) ↑↓ ↑↓ ↑↓↑↓↑↓

n=2, l=1, ml=0, ms=+1/2