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Exploring Density: The Mixing of Liquids in Grade 9 Science

In this Grade 9 Science exploration, students investigated the mixing of various liquids based on their densities. Each student's hypothesis differed: Kiran expected mixing, while Caileigh anticipated separation due to density differences. Jenna thought all would mix, and Keyth had mixed predictions. Their experiments revealed clear results—water and alcohol mixed, while others remained distinct. Precise measurements led to impressive layers without mixing, demonstrating the fascinating concept of density. The activity encourages design innovation, asking students to consider how layer density impacts a bottle design for oil and vinegar.

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Exploring Density: The Mixing of Liquids in Grade 9 Science

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  1. Grade 9 Science Exploring Density- Tyler , Dylan ,Jenna, Kiran, Caileigh, Keyth

  2. Adding Liquids Hypothesis • What did we think would happen? • Kiran thought some of the liquids would mix. • Caileigh thought it would not mix because of the different density levels. • Jenna thought they would all mix and thought it would harder to keep them separate • Keyth thought some would mix and some would not Results • What did happen? • Kiran used a pipette and the results were clear. The water and the alcohol mixed but the others stayed separate. • Caileigh and Jenna tried a few things. First one they all separated and although the soap settled below the water layer. They also tried mixing randomly, they mixed together and then started to separate giving off ‘bubbles’. • Keyth added his liquids maybe a little fast which mixed some of the layers, although they did settle. • Tyler and Dylan were very precise in their measuring and used 7 liquids, they stayed separate and “it looked cool” All there precision helped with the layers not mixing.

  3. Getting Ready

  4. Adding the Liquids

  5. Making Connections You are designing a new transparent bottle for an oil and vinegar salad dressing. Vinegar is mostly water. Some spices dissolve into the oil, some into the vinegar, and some spices remain separate. Look for the densities of oil and water in Table 1. Where in the bottle would you expect to find the oil layer? How would this affect the design of your bottle? Explain, using a sketch of your bottle design and label.

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