bonding what exactly is a bond depends ionic or covalent polar n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Bonding What exactly is a bond? Depends…Ionic or Covalent ? Polar? PowerPoint Presentation
Download Presentation
Bonding What exactly is a bond? Depends…Ionic or Covalent ? Polar?

Loading in 2 Seconds...

play fullscreen
1 / 15

Bonding What exactly is a bond? Depends…Ionic or Covalent ? Polar? - PowerPoint PPT Presentation


  • 72 Views
  • Uploaded on

Bonding What exactly is a bond? Depends…Ionic or Covalent ? Polar?. NON-POLAR COVALENT=> equal sharing of electron pair 0 < ∆EN < 0.4 POLAR COVALENT= unequal sharing of electron pairs , e-’s spend more time closer to one atom, 0.4 < ∆EN < 1.7

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Bonding What exactly is a bond? Depends…Ionic or Covalent ? Polar?' - hiroko


Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
bonding what exactly is a bond depends ionic or covalent polar
Bonding What exactly is a bond? Depends…Ionic or Covalent? Polar?

NON-POLAR COVALENT=> equal sharingof electron pair

0 < ∆EN < 0.4

POLAR COVALENT= unequal sharing of electron pairs, e-’s spend more time closer to one atom, 0.4 < ∆EN < 1.7

IONIC “BOND”= transfer of electrons, no physical connection to one another, atoms are held together by an electrostatic attraction, ∆EN > 1.7

molecular polarity
Molecular Polarity
  • Tutorial 1: p. 226
  • Figure 6: p. 228
  • p. 227 #1,2
  • HW: p. 229 #1-7ab

No molecular dipole

=> non-polar molecule

Molecular Dipole is present

=> polar molecule

No molecular dipole

=> non-polar molecule

Molecular Dipole is present

=> polar molecule

which process requires more energy why
Which process requires more energy?Why?

H2O(l) H2O(g)

or

2 H2O(l) 2 H2(g) + O2(g)

slide5

Intermolecular Forces

  • London force (dispersion)
  • due to electrostatic attraction b/w protons in one molecule and electrons of neighbouring molecules
  • strength α # of e-

Cl2bp = -35°C

I2bp = 84°C

Explain the trend in bp.

Cl2 has 34 e-. I2 has 106 e-.

I2 has more e- => greater LDF => higher bp

slide6

Intermolecular Forces

  • dipole-dipole force
  • due to attraction of one dipole by surrounding dipoles
  • strength α molecular polarity

CH2O is a polar molecule => has a dipole force, LDF (16 e-)

C2H6 is a non-polar molecule => no dipole force, only LDF (18 e-)

CH2O has higher bp due to dipole-dipole force

CH2O bp = -21°C

C2H6bp = -89°C

Explain the trend in bp.

Include diagrams to support

your explanation.

slide7
Predict which substance has the stronger dipole force: HCl or HBr

HCl is the more polar molecule (ΔEN is greater) => stronger dipole forces

(Draw diagrams to support your explanation.)

slide8

Intermolecular Forces

  • Hydrogen bonding
  • due to attraction of a H bonded to a highly EN atom (O, N or F) in one molecule by the lone pair of e- on a highly electronegative atom of a neighbouring molecule

H2Te bp = -10°C

H2Se bp = -50°C

H2S bp = -80°C

H2O bp = 100°C

Explain the trend in bp.

properties of liquids
Properties of Liquids

Cohesiveforces:

  • attractions b/w like molecules

Adhesive forces:

  • attractions b/w unlike molecules
capillary action
Capillary Action
  • Water is transported in thin tubes from roots to shoots.
  • adhesive forces (b/w H2O and sides of tubes) and cohesive forces (b/w H2O molecules)
  • Water is pulled up against gravity!
intermolecular forces and properties
Intermolecular Forces and Properties
  • Boiling and melting pt
  • Surface tension
  • Meniscus shape
  • Capillary action
  • Volatility
  • Viscosity
  • Solubility
  • Wetting Action
  • Hydrophobicity
homework
Homework
  • Section 4.7
  • p. 244 #1,2
  • p. 247 #1-6