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 - Challenge Me

NameDate

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

Water boils at 100 °C and hydrogen sulfide at -60.33 °C. In kelvins, how many times higher is water's boiling point, to 0.01, Ari?
Ammonia boils at -33.35 °C and methane at -161.5 °C. In kelvins, how many times higher is ammonia's boiling point, to 0.01, Bo?
Iodine boils at 184.4 °C and fluorine at -188.12 °C. In kelvins, how many times higher is iodine's boiling point, to 0.01, Esme?
4.
Why don't oil and water mix, Luz?
- Oil is ionic
- Each attracts its own kind more
- Water is nonpolar
5.
Milo says boiling water splits it into hydrogen and oxygen. Agree or disagree?
- Agree: heat breaks the O–H bonds
- Agree: steam is H and O
- Disagree: molecules stay whole
6.
Noah says melting ice breaks the covalent bonds in each water molecule. Agree or disagree?
- Agree: ice is made of atoms
- Disagree: only attractions loosen
- Agree: covalent bonds melt first
7.
Pia says a hydrogen bond is the bond inside H₂ gas. Agree or disagree?
- Agree: H₂ has a hydrogen bond
- Disagree: it joins two molecules
- Agree: any bond to H counts
8.
Which boils higher, NH₃ or H₂S, Ren?
- They boil at the same point
- H₂S
- NH₃
9.
Which boils higher, Cl₂ or Br₂, Tala?
- They boil at the same point
- Br₂
- Cl₂
10.
Which lists CH₄, NH₃ and H₂O from lowest to highest boiling point, Zee?
- H₂O, NH₃, CH₄
- CH₄, NH₃, H₂O
- NH₃, CH₄, H₂O

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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