Grade 10 · Science · Chemistry

10th grade Is the molecule polar? worksheet

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Is the molecule polar?

Grade 10 Science Worksheet

NameDate

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

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?
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?
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?
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
4.
Using the table, which two molecules are nonpolar, Jun?
- NH₃ and CO
- CO₂ and CH₄
- H₂O and HF
5.
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
6.
BF₃ has polar B–F bonds in a flat triangle. Is it polar, Noah?
- Yes: fluorine is heavy
- No: the three dipoles cancel
- Yes: its bonds are polar, so it is
7.
Why is NH₃ polar while BF₃ isn't, Pia?
- NH₃ has more atoms than BF₃ does
- NH₃'s pyramid doesn't cancel
- BF₃ has no bonds
8.
In a described demo, a thin water stream bends toward a charged comb. Why, Ren?
- The comb is wet
- Water molecules are polar
- Water is magnetic and attracted
9.
Why do oil and water separate into layers, Tala?
- Water is polar; oil is nonpolar
- Both are polar
- Oil is heavier than water
10.
Why does sugar dissolve well in water, Zee?
- Water is nonpolar
- Both are polar
- Sugar is a metal

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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