Is the molecule polar?

Answer Key - Grade 10 Science Worksheet

Circle the best answer, or write your answer on the line.

1. 1.

   Water's dipole moment is 1.857 D and HCl's is 1.093 D. How many times larger is water's, to 0.01, Ari?

   1.7 times
2. 2.

   Ammonia's dipole moment is 1.476 D and CO's is 0.112 D. How many times larger is ammonia's, to 0.01, Bo?

   13.18 times
3. 3.

   HF's dipole moment is 1.827 D and HCl's is 1.093 D. How many times larger is HF's, to 0.01, Esme?

   1.67 times

4. Read this first

   Measured dipole moments (NIST CCCBDB) (NIST CCCBDB)

   molecule	dipole moment (D)
   H₂O	1.857
   HF	1.827
   NH₃	1.476
   HCl	1.093
   CO	0.112
   CO₂	0
   CH₄	0

5. 4.

   Using the table, which two molecules are nonpolar, Jun?

   • CO₂ and CH₄
   • H₂O and HF
   • NH₃ and CO
6. 5.

   Using the table, which molecule is most polar, Kira?

   • H₂O
   • CH₄
   • CO
7. 6.

   Using the table, how polar is CO, Luz?

   • More polar than water
   • Nonpolar
   • Slightly polar
8. 7.

   CO₂ and H₂O both have polar bonds. Why is only H₂O polar, Milo?

   • Water is heavier
   • Water is bent; CO₂ is linear
   • Water's bonds are polar; CO₂'s aren't
9. 8.

   BF₃ has polar B–F bonds in a flat triangle. Is it polar, Noah?

   • No: the three dipoles cancel
   • Yes: its bonds are polar, so it is
   • Yes: fluorine is heavy
10. 9.

    In a described demo, a thin water stream bends toward a charged comb. Why, Ren?

    • Water is magnetic and attracted
    • Water molecules are polar
    • The comb is wet
11. 10.

    Why does sugar dissolve well in water, Zee?

    • Both are polar
    • Water is nonpolar
    • Sugar is a metal