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Chemistry µIB
4.2 Covalent Bonding
10 quick questions

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10 minutes maximum!

An IB Periodic Table is required.

1. Which statement is true for the formation of a covalent bond?
  • A.   Metal atoms share electrons with non-metal atoms
  • B.   Metal atoms transfer electrons to non-metal atoms
  • C.   Non-metal atoms share electrons with non-metal atoms
  • D.   Non-metal atoms transfer electrons to metal atoms

2. Which row in the table below is true for methane, CH4?

  Boiling point because ...
A high the C-H bonds in methane are strong
B high methane has strong intermolecular forces
C low the C-H bonds in methane are weak
D low methane has weak intermolecular forces
3. A covalent bond is the electrostatic attraction between ...
  • A.   positive ions and delocalized electrons
  • B.   a shared pair of electrons and the positively charged nuclei
  • C.   polar molecules
  • D.   oppositely charged ions

4. Which statements listed below are true in moving from S-O to S=O?

I. Bond strength increases
II. Bond length increases
III. Number of shared electrons increases
 
  • A.   I and II only
  • B.   I and III only
  • C.   II and III only
  • D.   I, II and III
5 Which statement about covalent bonds is NOT true?
  • A.   Nitrogen atoms share two pairs of electrons in N2
  • B.   The bonds in O2 are non-polar
  • C.   The O-H bonds in water are polar
  • D.   The C=O bond is stronger than the C-O bond

Q6-7
The electronegativity values of 4 non-metal elements are listed below:

Element W X Y Z
Electronegativity 2.6 3.2 3.0 2.2
 
6. Which covalent bond is most polar?
  • A.   Y-X
  • B.   Z-W
  • C.   Y-Y
  • D.   Z-X
7. Which bond polarity is correctly shown?
  • A.   δ+W-Xδ-
  • B.   δ+X-Yδ-
  • C.   δ+Y-Zδ-
  • D.   δ+W-Zδ-
8. Which statement is true?
  • A.   C≡C bonds share less electron pairs than C=C bonds
  • B.   C=C bonds are shorter than C-C bonds
  • C.   C=C bonds are polar
  • D.   C-C bonds require more energy to break them than C=C bonds
9. Which bond is least polar?
  • A.   N-F
  • B.   C-F
  • C.   B-F
  • D.   O-F
10. Which species contains a coordinate bond?
  • A.   N2
  • B.   NH3
  • C.   CO
  • D.   CO2