Is the molecule polar?

Answer Key - Grade 10 Science Worksheet - Building Confidence

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

1. 1.

   Water's dipole moment is 1.857 D and ammonia's is 1.476 D (NIST). How much larger is water's, to 0.01 D, Ari?

   0.38 D
2. 2.

   HF's dipole moment is 1.827 D and HCl's is 1.093 D (NIST). How much larger is HF's, to 0.01 D, Bo?

   0.73 D
4. 3.

   On the card, why is CO₂ nonpolar, Jun?

   • Its bonds aren't polar
   • Its arrows point opposite ways
   • It has no oxygen
5. 4.

   On the card, why is H₂O polar, Kira?

   Use the picture in question 3.

   • It is a straight line
   • It is bent, so they don't cancel
   • Its O–H bonds share electrons evenly
6. 5.

   On the card, which way do the arrows point, Luz?

   Use the picture in question 3.

   • Toward carbon
   • Toward hydrogen
   • Toward oxygen
7. 6.

   CO₂ has polar C=O bonds. Is the molecule polar, Noah?

   • No: the bonds cancel
   • Yes: oxygen pulls hard
   • Yes: polar bonds make it polar
8. 7.

   Why is CH₄ nonpolar, Pia?

   • Its bonds are even and symmetric
   • It is an ion
   • It has two lone pairs on its carbon
9. 8.

   Which molecule is polar, Ren?

   • H₂O
   • O₂
   • CO₂
10. 9.

    Why is O₂ nonpolar, Tala?

    • It is bent
    • Oxygen pulls harder
    • Both atoms pull equally
11. 10.

    Is NH₃ polar or nonpolar, Zee?

    • Polar
    • Neither
    • Nonpolar