Covalent Bonding
Chemistry ⇒ Chemical Bonding and Structure
Covalent Bonding starts at 8 and continues till grade 12.
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See sample questions for grade 9
Describe the difference between a single, double, and triple covalent bond.
Describe what happens to the outer electron shells of atoms when a covalent bond forms.
Describe what is meant by a 'shared pair' of electrons.
Explain why covalent compounds generally have low melting and boiling points.
Explain why H2 is a nonpolar molecule.
Explain why hydrogen and oxygen form a covalent bond in a water molecule.
How many covalent bonds are present in a molecule of methane (CH4)?
How many covalent bonds can a carbon atom form?
How many electrons are shared in a double covalent bond?
How many lone pairs of electrons are present on the oxygen atom in a water molecule?
How many shared electron pairs are present in a molecule of N2?
Name a common molecule that contains a triple covalent bond.
What is a covalent bond?
A student claims that the molecule BF3 (boron trifluoride) does not follow the octet rule. Explain why this is the case.
Consider the following scenario: A molecule has the formula X2Y, where X and Y are nonmetals. The molecule is found to be angular (bent) in shape. Explain what this suggests about the number of lone pairs on the central atom Y.
Describe the difference between a polar molecule and a nonpolar molecule, giving an example of each.
Explain why the molecule carbon dioxide (CO2) is considered nonpolar, even though it contains polar covalent bonds.
