• Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
Covalent Bonds
 

Covalent Bonds

on

  • 7,675 views

 

Statistics

Views

Total Views
7,675
Views on SlideShare
7,614
Embed Views
61

Actions

Likes
7
Downloads
261
Comments
0

8 Embeds 61

http://www.leadlms.com.sg 43
http://www.slideshare.net 10
https://sharklearn.nova.edu 3
http://cursos.itesm.mx 1
http://ncvps.blackboard.com 1
http://vhs.psdschools.org 1
https://mako.nova.edu 1
http://lms.twb.edu.in 1
More...

Accessibility

Upload Details

Uploaded via as Microsoft PowerPoint

Usage Rights

© All Rights Reserved

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
  • Full Name Full Name Comment goes here.
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

    Covalent Bonds Covalent Bonds Presentation Transcript

    • Chapter 9 Covalent Bonds pp. 240 - 267
    • Review..
      • What is a chemical bond?
        • Force that holds two atoms together
      • What is an ionic bond?
        • An electrostatic force that holds oppositely charged particles together in an ionic compound
        • Forms when….?
      • What are atoms and compounds always trying to achieve?
        • Stability
        • Complete set of valence electrons…
    • What is a covalent bond?
      • Chemical bond that results from sharing of valence electrons
    • Which bond is stronger?
      • Ionic vs. Covalent
      • Remember….
        • Ionic compounds are in a crystal lattice…many ions are bonded together in a crystal lattice
        • Covalent compounds are neutral and often found in the form of individual molecules
        • Ionic bonds are stronger than covalent bonds
    • How are covalent bonds formed?
      • Charge of nucleus?
      • Charge of electron cloud?
      • What happens when 2 fluorine atoms approach each other?
      • Covalent bond occurs at “Point of maximum attraction”
        • Attractive forces of nucleus for electrons and repulsive forces of electrons in each atom balance out
        • What would happen if the atoms kept moving closer?
    • What is a Molecule?
      • Compound made when two or more atoms bond together covalently
      • Diatomic molecules
        • In nature, sometimes two atoms of the same element are more stable when they are covalently bonded than the individual atom alone…
        • BrINClHOF
        • Br 2 I 2 N 2 Cl 2 H 2 O 2 F 2
    • Types of electrons in molecule
      • Look at fluorine
      • What is the electron configuration?
        • 1s 2 2s 2 2p 5
      • How many Valance electrons?
        • 7
      • Dot Structure?
      • What would two F atoms look like covalently bonded?
      • BONDING PAIRS are electrons involved in the covalent bond (shared electrons)
      • The pairs of electrons that are NOT involved in the covalent bond are called the LONE PAIRS (unshared electrons)
      • What are the lone pairs in…
    • In the fluorine molecule…
      • How many bonding pairs are there in each?
        • 1
      • How many lone pairs are there each?
        • 3
    • Lewis Dot Diagrams
      • When writing out molecules…
        • Bonding pairs can be represented by the electrons themselves or by a single line
        • If there is more than one bonding pair, two lines are used
        • Up to four lines can be used
        • EACH LINE REPRESENTS A BONDING PAIR OF ELECTRONS IN A MOLECULE
        • 1 line=2 electrons
        • Lines represent bonding pairs…you must still draw out lone pairs
    • 3 basic rules
      • Sum up valence electrons of all atoms in the molecule
      • Use a pair of electrons to form a bond between atoms…use a line to represent bond
      • Arrange remaining electrons to satisfy the duet rule for hydrogen and the octet rule for other atoms
      • (Verify that each atom has a complete set of electrons )
      • Elements is group 7A have how many valence electrons?
        • How many electrons would they share in a covalent bond with an atom in group 7A?
        • How many covalent bonds do are formed between bonding atoms in 7A?
      • Elements in group 6A have how many valence electrons?
        • How many electrons would they have to share in a covalent bond with another atom in group 6A?
        • How many covalent bonds do are formed between bonding atoms in 6A?
      • Elements in group 5A have how many valence electrons?
        • How many electrons would they have to share in a covalent bond with another atom in group 5A?
        • How many covalent bonds do are formed between bonding atoms in 5A?
      • Elements in group 4A have how many valence electrons?
        • How many electrons would they have to share in a covalent bond to be stable?
        • How many covalent bonds are formed between bonding atoms in group 4A?
    • Writing Chemical Equations showing covalent bond formation
      • See board…
    • Classwork…to turn in…
      • 1. PH 3
      • 2. H 2 S
      • 3. HCl
      • 4. CCl 4
      • 5. SiH 4
      6. HF 7. N 2 8. CH 4 9. CF 4
      • Show the formation of the following molecules…your final answer should be the correct Lewis Dot Structure