Target: 10 Questions in 10 minutes

An IB Chemistry data booklet is helpful

Q1+2: 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
 
1. Which of the covalent bonds below is most polar?
  • A.   Y-X
  • B.   Z-W
  • C.   Y-Y
  • D.   Z-X
2. Which bond polarity is correctly shown?
  • A.   δ+W-Xδ-
  • B.   δ+X-Yδ-
  • C.   δ+Y-Zδ-
  • D.   δ+W-Zδ-
3. Which bond is least polar?
  • A.   N-F
  • B.   C-F
  • C.   B-F
  • D.   O-F
4. 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

Q5+6: These questions concern sulfur fluoride, SF2.

5. Which is the correct Lewis (electron dot) formula for SF2?

  
lewis diagram SF2

6. What is the correct molecular shape for SF2 and will the molecule be polar or non-polar?

  Molecular Shape Polarity
A linear polar
B linear non-polar
C bent V-shape polar
D bent V-shape non-polar

7. Which statement is NOT true?

  • A.   CH4 has a tetrahedral shape
  • B.   NH3 is a non-polar molecule
  • C.   H3O+ has bond angles of approximately 107°
  • D.   NH4+ contains a coordinate bond
8. Which molecule is polar?
  • A.   CCl4
  • B.   BF3
  • C.   CO2
  • D.   PCl3
9. Which molecule has no net dipole moment?
  • A.   CCl4
  • B.   H2O
  • C.   NCl3
  • D.   HCl
10.Which of the following substances contains polar covalent molecules?
  • A.   BeCl2
  • B.   MgBr2
  • C.   CO2
  • D.   N2H2