Target: 10 Questions in 10 minutes

An IB Chemistry data booklet is helpful
1. Which is true for the formation of a covalent bond?
  • A.   Metal atoms share electrons with 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. 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

3. 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
4. Which statement is true?
  • A.   C=C bonds share more 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
5. Which species contains a coordinate bond?
  • A.   N2
  • B.   NH3
  • C.   CO
  • D.   CO2
6. Which species is trigonal planar in shape?
  • A.   PH3
  • B.   CCl4
  • C.   BF3
  • D.   H3O+

7. Which row shows the correct electron domain geometry and molecular geometry for the NH2- ion?

  Electron domain geometry Molecular geometry
A trigonal planar bent V-shaped
B trigonal planar linear
C tetrahedral linear
D tetrahedral bent V-shaped
8.Which statement is NOT true for the H3O+ ion?
  • A.   The oxygen atom has 3 electron domains
  • B.   It has a coordinate bond in its Lewis formula
  • C.   It has a trigonal pyramidal shape
  • D.   The H-O-H bond angles are approximately 107°

9. Which is the correct Lewis (electron dot) formula for the PCl3 molecule?

electron dot diagrams x4, PCL3
10. How many electron domains are on the carbon atom in carbon dioxide, CO2?
  • A.   2
  • B.   4
  • C.   6
  • D.   8