Bond Polarity and Electronegativity
Chemistry ⇒ Chemical Bonding and Structure
Bond Polarity and Electronegativity starts at 10 and continues till grade 12.
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Describe how electronegativity changes across a period in the periodic table.
Describe how electronegativity changes down a group in the periodic table.
Describe what is meant by a dipole moment in a molecule.
Explain why BF3 is a nonpolar molecule even though the B–F bonds are polar.
Explain why CO2 is a nonpolar molecule even though it contains polar bonds.
Explain why H2O is a polar molecule.
Explain why the H–Cl bond is polar.
If a molecule has polar bonds but is symmetrical, what is the overall polarity of the molecule?
Which element has the lowest electronegativity?
(1) Fluorine
(2) Cesium
(3) Oxygen
(4) Nitrogen
Which of the following best describes a polar covalent bond?
(1) Electrons are transferred from one atom to another
(2) Electrons are shared equally
(3) Electrons are shared unequally
(4) Electrons are not shared at all
Which of the following best explains why ionic bonds form between metals and nonmetals?
(1) Both have high electronegativity
(2) Both have low electronegativity
(3) Metals have low and nonmetals have high electronegativity
(4) Metals have high and nonmetals have low electronegativity
Which of the following bonds is the least polar?
(1) H–F
(2) H–Cl
(3) H–Br
(4) H–I
Fill in the blank: A bond with an electronegativity difference greater than 1.7 is generally considered ______.
Fill in the blank: The most electronegative element is ______.
The difference in electronegativity between two atoms determines the ______ of the bond formed between them.
The electronegativity difference between sodium (0.9) and chlorine (3.0) is ______.
True or False: A bond between two identical atoms is always nonpolar.
True or False: A molecule with a symmetrical shape and identical surrounding atoms is always nonpolar.
True or False: In a polar covalent bond, electrons are shared equally between the two atoms.
True or False: The greater the difference in electronegativity between two atoms, the more ionic the bond.
