SC.7.5.2.b: 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 Nebraska College and Career Ready Standards for Science (2024) outcome SC.7.5.2.b (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: Nebraska College and Career Ready Standards for Science (2024).
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 SC.7.5.2.b
- 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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