Grade 10 · Science · Chemistry

10th grade Is the molecule polar? worksheet

6 printable versionsBuilding Confidence10 questions · answer keyFree · no account

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Is the molecule polar?

Grade 10 Science Worksheet - Building Confidence

NameDate

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

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?
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?
3.
On the card, why is H₂O polar, Kira?
- Its O–H bonds share electrons evenly
- It is bent, so they don't cancel
- It is a straight line
4.
On the card, which way do the arrows point, Luz?
Use the picture in question 3.
- Toward carbon
- Toward oxygen
- Toward hydrogen
5.
What makes a bond polar, Milo?
- Uneven sharing of electrons
- A double bond
- Even sharing of the electrons
6.
CO₂ has polar C=O bonds. Is the molecule polar, Noah?
- Yes: polar bonds make it polar
- Yes: oxygen pulls hard
- No: the bonds cancel
7.
Why is CH₄ nonpolar, Pia?
- Its bonds are even and symmetric
- It has two lone pairs on its carbon
- It is an ion
8.
Which molecule is polar, Ren?
- O₂
- CO₂
- H₂O
9.
Why is O₂ nonpolar, Tala?
- Both atoms pull equally
- Oxygen pulls harder
- It is bent
10.
Is NH₃ polar or nonpolar, Zee?
- Neither
- Nonpolar
- Polar

Is the molecule polar?. Every version has 10 questions, and the answer key prints on the second page.

I can tell a polar bond (uneven sharing) from a polar molecule (dipoles that don't cancel).
I can use shape to decide polarity: CO₂ and BF₃ cancel; H₂O and NH₃ don't.
I can read measured dipole moments and compare them.
I can find a bent molecule's net dipole from 2μ cos(θ ÷ 2).

Standard: supports HS-PS1-3

dipole: A separation of partial positive and negative charge

dipole moment: A measure of polarity, in debyes (D)

polar molecule: A molecule whose bond dipoles don't cancel

nonpolar: With no overall dipole

symmetric: Balanced, so equal pulls cancel

Your child added the dipole moments. How much larger one is than another is a difference: subtract.

Your child divided the smaller by the larger. To say how many times more polar, divide the larger dipole by the smaller.

Your child added the bond dipoles as if they pointed the same way. In a bent molecule only their shared part adds: 2μ cos(θ ÷ 2).

What is the most common mistake with is the molecule polar??

Your child added the dipole moments. How much larger one is than another is a difference: subtract.

Are these 10th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

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