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.

   HCl's dipole moment is 1.093 D and CO's is 0.112 D (NIST). How much larger is HCl's, to 0.01 D, Esme?

   0.98 D
4. 3.

   On the card, why is CO₂ nonpolar, Jun?

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

   On the card, why is H₂O polar, Kira?

   Use the picture in question 3.

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

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

   Use the picture in question 3.

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

   What makes a bond polar, Milo?

   • Uneven sharing of electrons
   • Even sharing of the electrons
   • A double bond
8. 7.

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

   • Yes: oxygen pulls hard
   • Yes: polar bonds make it polar
   • No: the bonds cancel
9. 8.

   Why is CH₄ nonpolar, Pia?

   • It has two lone pairs on its carbon
   • Its bonds are even and symmetric
   • It is an ion
10. 9.

    Which molecule is polar, Ren?

    • O₂
    • H₂O
    • CO₂
11. 10.

    Is NH₃ polar or nonpolar, Zee?

    • Neither
    • Nonpolar
    • Polar