Grade 10 · Science · Chemistry

10th grade Is the molecule polar? worksheet

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Is the molecule polar?

Grade 10 Science Worksheet - Challenge Me

NameDate

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

A bent molecule has two bond dipoles of 1.51 D each at 104.48° (example values, like water). Using 2μ cos(θ ÷ 2), what is the net dipole, to 0.01 D, Ari?
A linear molecule has two bond dipoles of 0.8 D each at 180° (example values, like CO₂). Using 2μ cos(θ ÷ 2), what is the net dipole, Esme?
3.
Is carbon monoxide, CO, polar, Jun?
- Yes, slightly
- No: it has no bonds
- No: it is linear
4.
Is HCl polar, Kira?
- No: it is an ion
- Yes: its one bond is polar
- No: it is linear
5.
Which of these must be nonpolar, Luz?
- O₂, two identical atoms
- H₂O
- NH₃
6.
Noah says BF₃ must be polar because B–F bonds are polar. Agree or disagree?
- Agree: fluorine is reactive
- Disagree: the three cancel
- Agree: polar bonds make it polar
7.
Pia says a linear molecule with two equal bond dipoles has a net dipole of 0. Agree or disagree?
- Agree: cos 90° is 0
- Disagree: lines are polar
- Disagree: dipoles add up
8.
Which is more polar, HF or HCl, Ren?
- HCl
- They are equal
- HF, at 1.827 D
9.
Which is more polar, water or ammonia, Tala?
- Ammonia
- Water
- They are equal
10.
Why is HF more polar than HCl, Zee?
- Chlorine is more electronegative
- Fluorine is more electronegative
- HF is bent

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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