Grade 10 · Science · Chemistry

10th grade Forces between molecules and boiling points worksheet

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Forces between molecules and boiling points

Grade 10 Science Worksheet

NameDate

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

Hydrogen sulfide boils at -60.33 °C. What is its boiling point in kelvins, to 0.01 K, Ari?
Methane boils at -161.5 °C (CRC). What is its boiling point in kelvins, to 0.01 K, Bo?
Ammonia boils at -33.35 °C. What is its boiling point in kelvins, to 0.01 K, Esme?

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4.
Using the table, why does H₂O boil so much higher than H₂S, Jun?
- H₂S is ionic
- Water forms hydrogen bonds
- Water is the heavier molecule
5.
Using the table, which hydride boils lowest, Kira?
- CH₄
- H₂O
- NH₃
6.
Using the table, why does I₂ boil at 184.4 °C but F₂ at −188.12 °C, Luz?
- I₂ is larger, with stronger dispersion
- I₂ forms hydrogen bonds with itself
- F₂ is ionic
7.
What does a hydrogen bond connect, Pia?
- Two H atoms inside one single molecule
- An H to another molecule's N, O or F
- Two ions
8.
Why do halogen boiling points rise from F₂ to I₂, Ren?
- They become ionic
- Larger molecules, stronger dispersion
- They form more hydrogen bonds going down
9.
What makes dispersion attractions stronger, Tala?
- More electrons in a larger molecule
- Fewer electrons
- A smaller molecule
10.
Which halogen is a solid at room temperature, Zee?
- Chlorine
- Fluorine
- Iodine

Forces between molecules and boiling points. Every version has 10 questions, and the answer key prints on the second page.

I can name London dispersion, dipole-dipole and hydrogen-bonding attractions and say which molecules have each.
I can explain boiling points: water (100 °C) against hydrogen sulfide (−60.33 °C), and halogens rising with size.
I can say that boiling overcomes attractions between molecules, not bonds inside them.
I can explain everyday effects: surface tension, floating ice, oil and water.

Standard: HS-PS1-3

intermolecular force: An attraction between molecules

London dispersion: A weak attraction from shifting electron clouds, in every molecule

dipole-dipole: Attraction between polar molecules' partial charges

hydrogen bond: A strong attraction from H on N, O or F to another N, O or F

boiling point: The temperature where a liquid's molecules break free of each other

Your child added the boiling points. With negative temperatures, the gap is a subtraction: higher − lower.

Your child subtracted 273.15. Kelvins are bigger numbers: K = °C + 273.15.

Your child divided Celsius readings. Ratios of temperatures need kelvins, especially below zero.

What is the most common mistake with forces between molecules and boiling points?

Your child added the boiling points. With negative temperatures, the gap is a subtraction: higher − lower.

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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