7.PS1.5: 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 Oklahoma Academic Standards for Science (2026) outcome 7.PS1.5 (Physical Sciences) for Grade 7 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: Oklahoma Academic Standards for Science (2026).
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 7.PS1.5
- 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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