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Bell Work

Bell Work. 1.) Complete the “bell work” section on your lab worksheet. 2 .) Please get out a BLANK LINED PAPER to turn in at the end of the period !. Marshmallows Under Pressure Lab. Exploring the Relationship between Pressure & Volume ~ Boyle’s Law. Objective.

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Bell Work

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  1. Bell Work 1.) Complete the “bell work” section on your lab worksheet. 2.) Please get out a BLANK LINED PAPER to turn in at the end of the period!

  2. Marshmallows Under Pressure Lab Exploring the Relationship between Pressure & Volume ~ Boyle’s Law

  3. Objective Student will write a paragraph using his/her observations to justify a claim about the relationship between pressureand volume of a gas using new vocabulary.

  4. Exploring changes of pressure Opening a soda bottle

  5. Changes of Pressure Opening a soda bottle 2) For the gas inside the bottle, was the pressure increased or decreased?

  6. Changes of Pressure Pumping up a tire

  7. Changes of Pressure Pumping up a tire 3) For the gas inside the tire, was the pressure increased or decreased?

  8. Changes of Pressure Pushing plunger on syringe

  9. Changes of Pressure Pushing plunger on syringe 4) When I pushed the plunger down, was the pressure inside the syringe increased or decreased?

  10. Pressure (FOR YOUR NOTES!) The science definition of pressure: Pressure is the force exerted per unit area on a surface. It is the exertion of force upon a surface by an object, fluid, gas etc., in contact with it.

  11. Pressure With your partner: Share your answers to questions 2, 3, and 4. Then answer: 5) What is exerting the force on the inside surface of the bottle, tire, syringe?

  12. Pressure (FOR YOUR NOTES!) Pressure & Gas: Gases exert pressure by colliding with each other and the surfaces of their containers. Increased pressure means more collisions are occurring, decreased pressure means fewer collisions are occurring.

  13. Review: Volume Discuss with your partner: What is volume? Does gas have volume? Volume: the quantity of three-dimensional space occupied by a liquid, solid, or gas.

  14. Gas Vocabulary (FOR YOUR NOTES!) Inverse relationship If two things have an inverse relationship, one will decrease  if the other increases . For example: number of students who take the school bus and number of cars parked in the student parking lot

  15. Gas Vocabulary (FOR YOUR NOTES!) Direct relationship If two things have a direct relationship, one will increase  if the other increases . For example: happiness and number of tacos consumed

  16. Pressure and Volume We will explore the relationship between pressure and volume by observing how a marshmallow changes with increasing/decreasing pressure.

  17. But First! As you observe the marshmallow changing, think about how the volume of gas inside the marshmallow is changing!

  18. Directions: • Place one marshmallow at a time in the air piston. • Insert plunger and push down until it is slightly above marshmallow • Hold finger over piston opening • Pull plunger out and push plunger in to change the pressure • THINK ABOUT THE VOLUME OF GAS INSIDE THE MARSHMALLOW!

  19. The relationship between pressure and volumeWrite a paragraph that answers: • How did you increase the pressure on the marshmallow’s gas and how did it affect the marshmallow? • How did you decrease the pressure on the marshmallow’s gas and how did it affect the marshmallow? • Based on your observations, what can you claim about the relationship between pressure and volume of a gas? You must use your NEW VOCABULARY: inverse relationship, force, collisions, increase/decrease

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