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)?
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.
Which of the following best describes a double covalent bond?
(1) Sharing of one pair of electrons
(2) Sharing of two pairs of electrons
(3) Sharing of three pairs of electrons
(4) Transfer of electrons
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) No electrons are shared
Which of the following best describes the bond in a molecule of F2?
(1) Ionic bond
(2) Polar covalent bond
(3) Nonpolar covalent bond
(4) Metallic bond
Which of the following best explains why covalent bonds form?
(1) To achieve a full outer shell of electrons
(2) To lose electrons
(3) To form ions
(4) To increase atomic mass
Fill in the blank: In a single covalent bond, ______ pair(s) of electrons are shared between two atoms.
Fill in the blank: In a water molecule, the angle between the two hydrogen atoms is approximately ______ degrees.
Fill in the blank: The ability of an atom to attract shared electrons in a covalent bond is called ______.
Fill in the blank: The chemical formula for methane is ______.
True or False: Covalent bonds are generally stronger than ionic bonds.
True or False: Covalent bonds are usually formed between two nonmetal atoms.
True or False: Covalent bonds can only form between identical atoms.
True or False: Covalent bonds involve the transfer of electrons from one atom to another.
