Mass is Always Conserved
Free to teach as-is — the teacher guide, student handout, and slides are included.
Free — we'll email you an access link. Google Docs format.
Objective
I can apply the law of conservation of mass to chemical reactions.
Part 1 of 4
Warm-up video
Professor Dave Explains · 5:53Vetted channel
We don't generate video — this one is by Professor Dave Explains on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.
Part 2 of 4
Key concepts
3 concepts
- 1
The law of conservation of matter states that matter cannot be created or destroyed, only converted from one form to another.
- 2
When water boils, the steam has the same mass as the liquid water because the water molecules only speed up and move away from each other.
- 3
When a copper pipe rusts, it gains mass because oxygen atoms from the atmosphere bond to the copper atoms in the pipe.
Part 3 of 4
Practice
7 questions
State the law of conservation of mass in your own words.
If 10 grams of water are boiled in a closed container, what will be the mass of the steam produced?
Part 4 of 4
Exit ticket
Quick comprehension check
“When 4 grams of sodium react with chlorine, 10 grams of sodium chloride is produced. How many grams of chlorine reacted?”
Sample answer included in the free materials
Get the materials
Teacher guide, student handout, and slides — free, in Google Docs format
Teacher Guide
Complete lesson plan with answer keys and alternate activities
Student Handout
Printable worksheet
Slides
Ready to present
We'll ask for your email to send your access link — nothing else.
Teaching a group at a different level?
Where are your students right now? We'll rebuild this lesson to match — including the teacher guide, student handout, and slides, saved to your Google Drive.
Adapt This Lesson
