C121 11-3 lec21GL

C121 11-3 lec21GL - Lecture 21 October 28, 2011 Bonding:...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 21 October 28, 2011 Bonding: General Concepts Last Day: (a) Ionic bonds (cont’d) Factors Affecting L.E. Trends in Ion Size (b) Covalent bonds Nature of the Covalent Bond (13.1) Bond Dissociation Energy (13.7) Today: (b) Covalent Bonding (cont’d) Bond Energies and Chemical Reactions (13.8) Electronegativity (13.2) Bond Polarity and Dipole Moments (13.3) Polar Covalent Bonds
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Factors Affecting the Lattice Enthalpy Ion Size uH LE ~ 1/r Ionic Charge uH LE ~ Q 1 Q 2
Background image of page 2
Simple Cubic Simple Cubic 2 atom basis (bcc) Simple Cubic (fcc) Simple Cubic 2 atom basis (fcc) Diamond Fluorite Structure Zincblende
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Covalent Bonding – A Closer Look What is the nature of the bonding force between two non-metallic elements? Consider the formation of I 2(g) from gaseous iodine atoms: 53 I [Kr]5s 2 4d 10 5p 5 I(g) + I(g) I 2 (g) UH int = -151 kJ/mol I I 5p Sharing of 2e - to form a bond: Achieve a noble gas configuration
Background image of page 4
Plot the energy of interaction (uH inter ) as a fUnction of the distance between the two atoms uH inter = uH attraction + uH repUlsion e - on one atom attracted to +ve nUcleUs on other atom e - /e - and p + /p + repUlsion between atoms Enthalpy (kJ/mol) InternUclear Distance (pm) I (g) r 0 =266 pm 0 151 kJ/mol -151
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Comments on Bond Energies 1. Bond energy only applies to gaseous species.
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 20

C121 11-3 lec21GL - Lecture 21 October 28, 2011 Bonding:...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online