Reflection: Modeling Mixing Matter - Section 4: Reflect & Apply


This investigation was harder than I thought it was going to be! Many students grasped onto the idea that gravel and sand mixed together was going to have more mass than just the sand or just the gravel. I wanted them to see that the act of mixing matter doesn't change the overall mass.

To help students preserve and grapple with complex tasks and to focus on the fact that the overall mass of the gravel and sand separated is equal to the overall mass of the gravel and sand mixed, I held up the original 150 Grams of Gravel & 150 Grams of Sand from the beginning of the lesson. Then, I asked students: What if mixed the sand and gravel together? What would the mass be then? (300 grams)

I then placed the sand and gravel on a digital scale (150 Grams of Sand & Gravel on Scale) and sure enough, the total mass of the sand and gravel was 300 grams. 

What does this show? (When sand and gravel are mixed together, the overall mass of the sand and the gravel remains the same.)

  Modeling: Providing Another Model
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Mixing Matter

Unit 5: Matter
Lesson 10 of 11

Objective: SWBAT prove that the overall mass/weight of two substances is conserved, even when the two substances are mixed together.

Big Idea: In this lesson, students investigate the overall mass of gravel and sand before and after they are mixed together.

  Print Lesson
Science, Matter and its Properties, conservation of mass, mixture, Sand, gravel, chemical reaction
  90 minutes
students measuring the mass of sand
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