Alka-Seltzer Rocket/ Chemical Reactions Materials Needed Water(hot, cold, and room temperature) A film canister and cover One Alka-Seltzer packet (can be purchased at a pharmacy, CVS or Walgreens) 3 beakers Hot plate Ice Timer Thermometer Goggles Procedure 1. Write your prediction of which temperature of water will cause the fastest reaction. 2. Put goggles on! 3. Fill 3 beakers with a ¼ cup of water each. 4. Place one beaker on a hot plate and allow it to get hot. 5. Place ice in one beaker. 6. Record the temperature of each beaker of water. 7. Fill the film canister halfway with room temperature water. 8. Put half an Alka-Seltzer tablet in the can and put the cover on immediately. 9. Begin the timer once the cover is placed on the can. Record the amount of time it takes for the cover to pop off. 10. Wash the film can out and fill it halfway with warm water. 11. Put half an Alka-Seltzer tablet in the can and put the cover on immediately. 12. Begin the timer once the cover is placed on the can. Record the amount of time it takes for the cover to pop off. 13. Wash the film can out and fill it halfway with cold water. 14. Put half an Alka-Seltzer tablet in the can and put the cover on immediately. 15. Begin the timer once the cover is placed on the can. Record the amount of time it takes for the cover to pop off. 16. Record any indications of a chemical reaction. 1. Predict which temperature of water you think the reaction will occur the fastest in. ______________________________________________________________________________ ______________________________________________________________________________ 2. Fill in the table below. Beaker 1 2 3 Temperature Time of Reaction 3. Record the indicators of a chemical reaction that you observed during this experiment. ______________________________________________________________________________ ______________________________________________________________________________ 4. Which temperature caused the reaction to occur the fastest? Why? Was your prediction correct? ______________________________________________________________________________ ______________________________________________________________________________ 5. Did any problems occur during the experiment? What sources of error are there? ______________________________________________________________________________ ______________________________________________________________________________ Scientific Explanation The reaction occurs the fastest in hot water because the molecules were the most active at this temperature. The molecules had more energy and were bumping into each other, causing the bonds of the molecules to interact. When the molecules interacted, the Alka-Seltzer began to fizz, displaying an indication that a chemical reaction was occurring. The cap popped off of the canister when the reaction filled up the container.
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