11/12/2018 - - PDF document

11/12/2018 1

http://assign3.chem.usyd.edu.au/spectroscopy/reductionOperator.php?res=high

11/12/2018 2

Write the best dot structure you can for NO2. NO2 is a radical. Is the unpaired electron on nitrogen or oxygen? A. nitrogen B.

• xygen

C. NO2 is not a radical

11/12/2018 3

11/12/2018 4

Predict the structure of PCl2F3 ? A. B. C.

Cl P Cl F F F

F P Cl Cl F F

Robert R. Holmes, Richard P. Carter Jr., George

• E. Peterson, Inorg. Chem. 1964, 3, 1748–1754.

PCl2F3

11/12/2018 5

19F31P coupling

 all F equivalent rapid fluctuation

PCl2F3

What is the structure of PCl2F3 at ‒143C? A. B. C.

Cl P Cl F F F

F P Cl Cl F F

11/12/2018 6

19F31P coupling 19F31P coupling 19F31P coupling

red arrows show

19F19F coupling

   

 all F equivalent rapid fluctuation

PCl2F3

Which hydrocarbon is more acidic? A. HCCH B. H2CCH2 C. H3CCH3

11/12/2018 7

http://www.chemguide.co.uk/inorganic/group7/properties.html

11/12/2018 8

The trend in HX gas-phase acidity, where X = F, Cl, Br, I, is due to... A. HX bond strength. B. the ionization energy of H. C. the electron affinity of X. D. more than one of these factors.

11/12/2018 9

11/12/2018 10

As, 120 kJ/mol Se, 200 kJ/mol

Trends: The band gap (ΔE)...

decreases down the periodic table. (Metallic nature increases as you go down the periodic table.) increases for AB as ΔEN increases. (AB becomes more ionic as ΔEN increases.) increases across (left to right) the periodic table. (Metallic nature decreases as you go across the periodic table; e.g. Al vs Si.)

11/12/2018 11

Acid-Base Models

Arrhenius Theory acids increase the concentration of H+ in water bases increase the concentration of OH‒ in water Brønsted-Lowry Theory acids are proton (H+) donors bases are proton (H+) acceptors Lewis Theory acids are lone pair acceptors bases are lone pair donors

Abridged version of Fig. 9.5 (p. 349, in Huheey 4e) The Irving-Williams effect

11/12/2018 12

11/12/2018 13