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Wednesday, May 21 st : “A” Day Thursday, May 22 nd : “B” Day (Sr. finals)

Wednesday, May 21 st : “A” Day Thursday, May 22 nd : “B” Day (Sr. finals). Collect Books Collect Free Homework Pass Alka Seltzer Rocket Lab!. Collect Books. If you need a few minutes to say goodbye to your chemistry textbook of awesomeness, please do so now…. Collect Free Homework Pass.

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Wednesday, May 21 st : “A” Day Thursday, May 22 nd : “B” Day (Sr. finals)

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  1. Wednesday, May 21st: “A” DayThursday, May 22nd: “B” Day (Sr. finals) • Collect Books • Collect Free Homework Pass • Alka Seltzer Rocket Lab!

  2. Collect Books • If you need a few minutes to say goodbye to your chemistry textbook of awesomeness, please do so now…..

  3. Collect Free Homework Pass • If you haven’t used your free homework pass yet, good for you! • Turn it in for 10 pts extra credit!

  4. Lab: “Alka Seltzer Rockets” • There is no lab write-up for this lab! • This lab will not be graded!

  5. Lab: “Alka Seltzer Rockets” • When alka seltzer tablets are put into water, carbon dioxide gas is generated. • In a sealed container, the gas causes an increase in pressure, which must be released.

  6. Lab: “Alka Seltzer Rockets” • Alka seltzer is mainly sodium bicarbonate and citric acid. • When these two chemicals are mixed in water, the reaction is exothermic and CO2 gas is generated along with sodium citrate: H3C6H5O7 + 3 NaHCO3 3 CO2 + 3 H2O + NaC6H5O7 What kind of reaction is this?

  7. Lab: “Alka Seltzer Rockets”Purpose/Hypothesis • Purpose: • The purpose of this lab is to demonstrate Newton’s 3rd law of motion: “For every action there is an opposite and equal reaction” and to control variables in order to achieve optimum rocket performance. • Hypothesis: • How high do you thing the rocket will fly? • Which variables will optimize the performance/why?

  8. Lab: “Alka Seltzer Rockets”Materials • Safety glasses • Alka seltzer tablets • Film canisters with snap-on lids • Water (hot/cold) • Temperature Probe • Timer (can use phone) • Meter Stick/tape measure/tape • Any other materials that you may want to try…

  9. Lab: “Alka Seltzer Rockets”Procedure Hints • After adding the alka seltzer to the film canister, snap on the lid quickly. • Place the filled canister upside-down on the sidewalk and back away. • WAIT for it…. • If nothing happens, wait about 30 seconds before approaching the canister. WHY do you think it didn’t work?

  10. Lab: “Alka Seltzer Rockets”Things to think about… • Size of the tablet • Age of tablet • Brand of tablet • Volume of water • Temperature of water • Orientation of canister • Shake canister • What other variables can you think of…

  11. Lab: “Alka Seltzer Rockets” • Since this lab may be kind of messy, we’ll be going outside to launch the rockets. • Again, I won’t be collecting anything and nothing will be graded, but you still want to make a data table to record your results… • Try to optimize your variables to get the maximum height!

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