Read this to the class:
A Grade 7 student baked muffins and weighed the batter before it went in the oven. When the muffins came out, they weighed less. Her little brother said, "The oven destroyed some of the muffin." She said that couldn't be right, but she couldn't say where the missing grams went. Your team's job: find out whether a chemical reaction can really destroy mass, or whether it just goes somewhere.
Teams of three, with three jobs that rotate between Part A and Part B: Chemist (mixes and caps), Scale reader (zeroes and reads the scale), Recorder (writes every mass).
In the full lesson PDF
- Bet (5–10 min)
- Hunt (20 min)
- Reveal (10–15 min)
- Act (10 min)
- Background for the teacher
- Assessment
- Student sheet
US Letter, prints cleanly in black and white. The student sheet is on its own page, ready to photocopy.