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Savannah, you created a memorable lesson! First hand experiences like melting chocolate in our hands gives us the foundational experiences for later understanding of complex concepts.
I agree with Diavion that the concept of particles, or changes in the energy of the matter (chocolate in this case), should be left for when the children are in third grade or older. The NGSS APPENDIX E – Progressions Within the Next Generation Science Standards describes the DCI at ages K-2, 3-5, 6-8, and 9-12.
When teaching PS1.A Structure of matter, the concept of particles is introduced in grades 3-5 (see page 7). But you can support younger children's developing a basic understanding of this concept by providing experiences and discussing how parts make up the whole, such as blocks in a Legos structure, grains of sand in the sandbox, or leaves on a tree.
See all NGSS Appendices here: https://www.nextgenscience.org/resources/ngss-appendices
Best wishes,
Peggy
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