MS-PS1-5 lessons
Develop and use a model to describe how the total number of atoms does not change in a chemical reaction, so mass is conserved.
The Next Generation Science Standards code MS-PS1-5 asks students to: “Develop and use a model to describe how the total number of atoms does not change in a chemical reaction, so mass is conserved.” These Fieldbook lesson teaches it hands-on, with everyday materials, a printable teacher guide and a student sheet.
Kitchen Chemistry Grades 7–8
- 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.
NGSS is used as written in Arkansas, California, Connecticut, Delaware, District of Columbia, Hawaii, Illinois, Iowa, Kansas, Kentucky, Maine, Maryland, Michigan, Nevada, New Hampshire, New Jersey, New Mexico, Oregon, Rhode Island, Vermont, Washington, so the code MS-PS1-5 matches there. Other states word and number their own versions: see curriculum alignment for your state's codes.
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