Draw Lewis structures of molecules
Grade 10 Science Worksheet - Challenge Me
Circle the best answer, or write your answer on the line.
Water has 8 valence electrons and 2 bonding pairs. How many lone pairs are in 3 water molecules, Ari?
Oxygen gas, O₂, has 12 valence electrons and 2 bonding pairs. How many lone pairs are in 5 O₂ molecules, Esme?
A drawing gives carbon five bonds. What is wrong, Kira?
- Nothing is wrong
- Carbon needs six bonds to be full
- Carbon would have 10 electrons
A drawing of H₂O shows 10 electrons. What is wrong, Luz?
- Water has only 8 valence electrons
- It needs 12 electrons for the oxygen
- Oxygen needs 10
Milo says water's oxygen has only 4 electrons because it has two bonds. Agree or disagree?
- Agree: two bonds is four
- Agree: just the bonding pairs count
- Disagree: its lone pairs count too
Noah says nitrogen in NH₃ breaks the octet rule with only 3 bonds. Agree or disagree?
- Agree: nitrogen needs 5 bonds to be full
- Agree: 3 bonds make 6
- Disagree: its lone pair makes 8
Pia draws O₂ with a single bond. Agree or disagree that this works?
- Disagree: it needs a double bond
- Agree: oxygen has just 2 electrons to share
- Agree: one bond is enough
Why does CO₂ need double bonds, Ren?
- Oxygen is too small
- Single bonds leave carbon short
- Carbon has too many electrons already
How is a double bond made when drawing a Lewis structure, Tala?
- A lone pair becomes a shared pair
- Electrons are removed
- A new atom is added
Why does H₂O need no double bonds, Zee?
- Oxygen has no lone pairs
- Single bonds already complete it
- Hydrogen forms two bonds