Grade 10 · Science · Chemistry

10th grade Draw Lewis structures of molecules worksheet

6 printable versionsOn Level10 questions · answer keyFree · no account

When it’s done, scan the sheet with your phone and PencilGo marks it and picks the next one. Create a free account

Version

Draw Lewis structures of molecules

Grade 10 Science Worksheet

NameDate

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

CO₂ has 16 valence electrons. After drawing 2 single bonds, O–C–O, how many electrons are left to place, Ari?
NH₃ has 8 valence electrons. After drawing 3 single bonds to hydrogen, how many electrons are left to place, Esme?
3.
How many shared pairs make a double bond, Jun?
- One
- Two
- Four
4.
How are the oxygens joined to carbon in CO₂, Kira?
- By a single bond each
- By one shared triple bond
- By a double bond each
5.
How many electrons does a triple bond share, Luz?
- 3
- 9
- 6
6.
After drawing the single bonds, what comes next, Noah?
- Remove a hydrogen
- Add lone pairs to reach octets
- Stop: bonds alone give octets
7.
Which atom goes in the middle of CO₂, Pia?
- Neither
- Carbon
- Oxygen
8.
On the card, how many lone pairs does nitrogen in NH₃ have, Ren?
- Zero
- Three
- One
9.
On the card, how many lone pairs does each oxygen in CO₂ carry, Tala?
Use the picture in question 8.
- Three
- One
- Two
10.
On the card, which molecule has no lone pairs, Zee?
Use the picture in question 8.
- CH₄
- H₂O
- NH₃

Draw Lewis structures of molecules. Every version has 10 questions, and the answer key prints on the second page.

I can count a molecule's valence electrons and draw its skeleton with single bonds.
I can place lone pairs so each atom has an octet (hydrogen has 2).
I can use double bonds when single bonds leave atoms short, as in O₂ and CO₂.
I can check a drawing for wrong electron counts or too many bonds.

Standard: none (TX, FL)

Lewis structure: A drawing of a molecule's bonds and lone pairs

lone pair: Two valence electrons not shared in a bond

single bond: One shared pair of electrons

double bond: Two shared pairs of electrons

octet rule: Atoms tend to end with 8 outer electrons

Your child counted each kind of atom once. Add the valence electrons of every atom in the molecule.

Your child took one electron per bond. Each single bond is a shared pair: 2 electrons.

Your child counted lone electrons, not pairs. Divide the leftover electrons by 2 to get lone pairs.

What is the most common mistake with draw lewis structures of molecules?

Your child counted each kind of atom once. Add the valence electrons of every atom in the molecule.

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.

Every sheet you scan goes into your child’s record: dated, marked and ready for the year-end portfolio. Homeschool records