Chemistry Basics
MS-PS1-1
Interpret formulas and model compound composition
Use formulas to count atoms and describe composition.
Learn the skill
- 1Use formulas to count atoms and describe composition.
- 2Model molecules and compounds with drawings or manipulatives.
Cited instruction
Use the publisher's material for instruction, then return to PeerTutor for the checked practice written for this skill.
Compounds and chemical formulas · Khan AcademyPractice preview
How many total atoms are in 4 molecules of H2O?
How many oxygen atoms are in 33 molecules of CO2?
How many total atoms are in 3 molecules of H2O?
Course mapping reviewed by Nikhil on 2026-08-26. Practice is authored for PeerTutor and does not reproduce linked providers' exercises.