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Grade 8 Science: Fantastic Fluids

Chapter 4 . Grade 8 Science: Fantastic Fluids. Overview. Molasses Flood States of Matter – Fluid or non-fluid Solid Liquid Gas Particle Theory of Matter. Materials Required. Balloon Container(s) Sugar. Slow as Molasses in July.

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Grade 8 Science: Fantastic Fluids

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  1. Chapter 4 Grade 8 Science: Fantastic Fluids

  2. Overview • Molasses Flood • States of Matter – Fluid or non-fluid • Solid • Liquid • Gas • Particle Theory of Matter

  3. Materials Required • Balloon • Container(s) • Sugar

  4. Slow as Molasses in July • Has anyone heard of the expression “as slow as molasses in January?” • What do you think this expression means?

  5. Introduction • Read Flowing Fluid Floods City

  6. Molasses Flood • What caused the tank to burst?

  7. Particle Theory of Matter • Matter is anything that has space and weighs something • All matter is made up of very small particles • What is a particle? • All particles in a pure substance are the same. Pure gold and impure gold. • There is space between the particles. • The particles are always moving. As the particles gain energy, they move faster. Particles can gain energy if they are heated up. • The particles in a substance are attracted to one another. The strength of the attractive force depends on the type of particle. Compare air and water.

  8. Space Between Particles

  9. States of Matter • Solid State – state of matter of a substance that has a definite shape and volume • Liquid State – state of matter of a substance that does not have a definite shape but has a definite volume • Gas State – state of matter of a substance that has neither a definite shape nor a definite volume • (In class examples)

  10. Introduction • What is a fluid? • Can anyone think of some examples? • Determine whether substances in the three states of matter are a fluid.

  11. Solids • Are solids a fluid? • Why or why not? • (Try in class)

  12. Solids Are Not Fluids • Solids used in the everyday household (powder cleansers, dishwashing detergent, sugar) do not flow but are actually poured. • Each grain can be broken into fragments and each fragment is simply a copy of the larger grain. In addition, each fragment can hold its shape and actually contains billions of particles. • Earthworm • Even though solids flow out of their container they do not have the ability to flow and simply form a mound or heap.

  13. Liquids • Are liquids a fluid? • Why or why not? • (Try in class)

  14. Liquid As A Fluid • Yes, liquids are fluids. • Liquid particles cannot hold their shape and take up the space of the container they are in • Liquids form a level surface at rest and since water particles (molecules) are so tightly packed together they are greatly affected by the downward pull of gravity.

  15. Gas • Is gas a fluid? • Why or why not? • Try in class.

  16. Gas As A Fluid • Yes, gas is considered to be a fluid. • Gas particles are very far apart and thus easily move past each other. • Gas particles move in every direction and move up, down, and sideways until all corners of its container is taken up • Defies gravity – relate to clouds • Diffusion

  17. Conclusion • What state of matter is the molasses in? • Why did the tank burst? • How did the molasses gain such tremendous speed as it traveled towards town? • Introduce viscous? • How is it related to story?

  18. Next Lesson • Review - copy • Viscosity • Buoyancy • 8S – helium and xenon clips • Notes • Taught to 8K and 8M

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