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chemistry
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SCH3U
Worksheet: Polarity and shapes power point
1. What is a covalent bond?
2. Use an example of covalent bond to explain equal sharing of electron pair(s) between two atoms.
3. Define non polar covalent bond.
4. Define polar covalent bond.
5. Use an example of covalent bond to explain unequal sharing of electron pair(s) between two atoms.
6. Where on the periodic table you will find elements having strong attraction for shared electron pair?
7. How do you represent a polar covalent bond?
8. Define electronegativity and periodic trend related to electronegativity.
9. How can we predict the nature of a covalent bond?
10. What should be the electronegativity difference range between two bonding atoms to form a non polar covalent bond?
11. What should be the electronegativity difference range between two bonding atoms to form polar covalent bond?
12. What should be the electronegativity difference range between two bonding atoms to form ionic bond?
Polarity and shapes of covalent Molecules
13. How can we determine the shape and polarity of a molecule?
14. What is bonding pair of electron?
15.What is lone pair of electrons?
16.What is the shape and polarity of a diatomic molecule?
17. What important consideration we should keep in mind while determining shape and polarity of a polyatomic molecule?
Shapes of molecules can be determined by: finding central atom
drawing Lewis structure of polyatomic molecules
counting lone pair and bonding pair of electrons around
counting multiple bonds as single bonds
A polyatomic molecule will be non- polar if : there are no lone pairs on central atom ( generally)
the shape of the molecule is symmetrical
18. Fill in the following table with needed information.
TABLE: Shapes and polarity of molecules
Case Bonding electron pairs around central atom
Lone pairs around central atom
Shape of the molecule
Polarity of the molecule
Example
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