Chemistry

3rd grade mixtures

Hello,

I am a student teacher in the Houston area. Currently I am working on a lesson over mixtures for my third grade science class. The biggest concern I have for misunderstanding is that my students will look too detailed into what a mixture is. For example, sand is considered not a mixture on it's own, but they might think it is because it is made up of different pieces of rocks. Same with Kool-aid mix. The kool-aid mix is not a mixutre on its own, but the back lists ingredients. What is the best what that I can clear this misunderstanding for my students?

 

Thank you

Brenda DeLuna
Brenda DeLuna
515 Activity Points

Brenda - 

Here are some NSTA resources on mixtures you may find helpful in addressing misconceptions and introducing key concepts. I concur with the previous commenter - both sand and Kool-Aid are indeed mixtures. 

Emily Faulconer
Emily Faulconer
3050 Activity Points

Sand is a mixture. Sand is made up of different kinds of rocks with different compositions such as metamorphic, sedimentary, and igneous rock pieces. Sand is not a pure substance but made up of different types of substances. It is heterogenous as well. 

https://www.reference.com/science/sand-compound-mixture-610e12d65aec447a

https://chemistry.stackexchange.com/questions/44825/is-sand-a-mixture-or-a-compound

Kool-aid is made of those ingredients on the list, which are uniformly found in each particle of the kool-aid material. Each particle or grain of kool-aid will have the same composition; therefore it is a homegenous mixture. Thus both of your examples are mixtures. 

https://www.quora.com/How-is-Kool-aid-considered-a-homogeneous-mixture

https://www.enotes.com/homework-help/sugar-an-example-n-while-koolaid-an-example-n-259589

 

Hope this helps.

Bev DeVore-Wedding
Bev Bev DeVore-Wedding
4468 Activity Points

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