3.2.6-8.E: Develop and use a model to describe how the total number of atoms…
Develop and use a model to describe how the total number of atoms does not change in a chemical reaction and thus mass is conserved.
The Pennsylvania Science, Technology & Engineering, Environmental Literacy & Sustainability (STEELS) Standards outcome 3.2.6-8.E (Physical Sciences) for Grades 6–8 says: “Develop and use a model to describe how the total number of atoms does not change in a chemical reaction and thus mass is conserved.” This Fieldbook unit teaches it hands-on, with everyday materials and a printable teacher guide and student sheet for every lesson. Official wording: Pennsylvania Science, Technology & Engineering, Environmental Literacy & Sustainability (STEELS) Standards.
Kitchen Chemistry Grades 7–8
Fizzing, curdling and colour changes with things from the grocery store. Students gather evidence of new substances, weigh a reaction in a sealed bottle, and turn red cabbage into an acid detector.
- Where does the mass go? 50–60 min
Teams weigh baking soda and vinegar reacting in an open cup, then in a capped pop bottle. The open cup gets lighter and the capped bottle doesn't, until they open it. Students use atoms to explain why mass is never lost in a reaction, only let out.
Printable practice for 3.2.6-8.E
- Kitchen Chemistry workbook included with the unit
1 word wall, 1 English-support page, 1 practice page, 1 reading, 1 unit review, 1 unit test, with answer keys.
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Compared with NGSS: MS-PS1-5.
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