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VSEPR Theory

VSEPR Theory. Lesson Six. VSEPR. Group 1: BeF 2 , HgCl 2 , CO 2 Group 2: AlCl 3 , SO 2 , O 3 Group 3: CH 4 , OF 2 , PCl 3 Group 4: PCl 5 , SBr 2 , XeF 2 Group 5: SF 6 , ClF 5 , XeF 4

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VSEPR Theory

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  1. VSEPR Theory Lesson Six

  2. VSEPR • Group 1: BeF2, HgCl2, CO2 • Group 2: AlCl3, SO2, O3 • Group 3: CH4, OF2, PCl3 • Group 4: PCl5, SBr2, XeF2 • Group 5: SF6, ClF5, XeF4 • In groups, observe the groups attached to the center atom, groups of lone pairs, and groups of atoms. Create a chart and be prepared to come up to the board and enter in your findings

  3. 2 0 BeF2 F Be F Molecule Lewis Structure Groups Bonded Electrons Bonded to Central Atom to Central Atom HgCl2 CO2

  4. AlCl3 Molecule Lewis Structure Groups Bonded Electrons Bonded to Central Atom to Central Atom SO2 O3

  5. CH4 Molecule Lewis Structure Groups Bonded Electrons Bonded to Central Atom to Central Atom OF2 PCl3

  6. PCl5 Molecule Lewis Structure Groups Bonded Electrons Bonded to Central Atom to Central Atom SBr2 XeF2

  7. SF6 Molecule Lewis Structure Groups Bonded Electrons Bonded to Central Atom to Central Atom ClF5 XeF4

  8. VSEPR • The properties of molecules depend on the bonding atoms as well as the 3-D arrangement of atoms in space • VSEPR (Valence Shell Electron Pair Repulsion) • VSEPR theory states that repulsion between the sets of valence-level electrons surrounding an atom causes these sets to be oriented as far apart as possible

  9. VSEPR • This assumption that electrons in molecules repel each other accounts for the molecular shapes of each atom • You need to learn these so that you can draw out the arrangement of atoms and fully understand their orientation • Consider a diatomic molecule such as BF2 that we discussed. What arrangement could be created so that the atoms are the farthest apart? • If the molecules are arranged on opposite sides of the central atom they are the farthest apart • Let’s go through this video to get a visual of these shapes

  10. VSEPR

  11. VSEPR • Now that we have a good idea of the possible shapes, let’s work through this tutorial for further practice with these three-dimensional shapes and more clearly visualize the shapes • http://www.uwosh.edu/faculty_staff/gutow/VSEPR_TUTORIAL/shtml%20version/VSEPR_Intro.shtml • Make sure to explore all parts of the website and take notes. These will help you be able to draw and visualize many different molecules

  12. The molecule is in its VSEPR shape. The Lewis Structure is located to the right. Click on the links to change the molecule to the left. Example for five bonding domains

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