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 - Building Confidence

NameDate

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

Water boils at 100 °C and hydrogen sulfide at -60.33 °C (PubChem). How many degrees higher does water boil, Ari?
Water boils at 100 °C and ammonia at -33.35 °C (PubChem). How many degrees higher does water boil, Esme?
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Molecule sketches side by side with dotted lines for attractions. CH₄ molecules: weak London dispersion attractions. HCl molecules: dipole-dipole attractions between the partly positive H and partly negative Cl. H₂O molecules: hydrogen bonds, O–H···O.
3.
On the card, what attraction holds CH₄ molecules together, Jun?
- Hydrogen bonds
- Ionic bonds
- London dispersion
4.
On the card, what do the dotted lines between water molecules show, Kira?
- Hydrogen bonds
- Covalent bonds
- Ionic bonds
5.
What is overcome when water boils, Milo?
- Bonds inside each of the molecules
- Attractions between molecules
- The nuclei of the atoms
6.
What is steam made of, Noah?
- Whole H₂O molecules
- Hydrogen gas alone
- Separate H and O atoms
7.
Which attraction acts between every kind of molecule, Pia?
- Hydrogen bonding
- Dipole-dipole
- London dispersion
8.
For molecules of similar size, which attraction is strongest, Ren?
- Dipole-dipole
- London dispersion
- Hydrogen bonding
9.
How do stronger attractions affect boiling point, Tala?
- They don't change it
- They lower it
- They raise it
10.
How do attractions between molecules compare with bonds inside them, Zee?
- They are much stronger
- They are much weaker
- They are the same thing

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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