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Exploring Buoyancy and Bubbles: The Lifting Power of Water

Discover the fascinating science of buoyancy and how water lifts objects through its unique properties and forces. Learn about the role of density, polarization, hydrogen bonding, and surface tension in creating buoyancy. Through a hands-on lab experiment with raisins, baking soda, and vinegar, observe the effects of different densities and gas bubbles on floating and sinking. Engage with guided questions to deepen your understanding of these principles and make sense of the behavior of raisins in a liquid environment.

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Exploring Buoyancy and Bubbles: The Lifting Power of Water

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Presentation Transcript

  1. How Water Moves ABC

  2. Water Lifts • Water has a lifting force: buoyancy • Water can lift things because: • it is dense, • a polarized molecule, • has a hydrogen bond, and • creates surface tension

  3. Another force… • Another force works against buoyancy. • It is called: gravity • When an object is placed in water, the object and the liquid push against each other.

  4. Vinegar and Water • Vinegar is heavier than water • Therefore, vinegar will push the lighter things upward • You will see what effect this creates in our lab

  5. Journeys in the life of a raisin • Pour 100 ml tap water into the 250 ml beaker • Add 1 teaspoon of baking soda • Add several raisins • Add 15 ml of vinegar • Observe what happens for several minutes, record your observations • Add another 15 ml of vinegar • Observe for several minutes, answer the questions

  6. Answer the following • Some of the raisins floated because______________ • After rising, most of the raisins sank, because______________ • After rising, some bubbles attached to the raisin at the bottom because__________________ • After rising, some raisins turned or flipped over as they sank because________________ • After a period of time, most raisins stopped rising because____________ • Some raisins did not rise because___________________ • Raisins with a lot of bubbles rise, but those with a few don’t because_______________________

  7. Bubbles • Bubbles are caused by a gas called carbon dioxide • Bubbles create a buoyancy force or lifting force • Therefore, bubbles can lift the things that they attach themselves to.

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