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Transcript

Plop Plop Fizz Fizz

Photos of experiment

Results

Conclusion

Graph

Procedure

Materials

Hypothesis

Question

Hot water

I think that the Alka-seltzer tablet will dissolve faster in the hot water than the cold or ice water.

1. First, in the Lab notebook, make a data table to record the results of the experiment.

2. Prepare a drinking glass so that it is marked at the 250mL point. You will use the same glass for multiple trials, so it is convenient to mark the desired water level.

  • Add 250mL (approx. 1 cup) of water to the drinking glass.
  • Use a piece of masking tape on the outside of the glass to mark the water level, placing the tape with its top edge even with the water level in the glass.

3. You will fill the drinking glass with the same volume of water at three different temperatures: hot tap water, cold tap water, and ice water.

  • For the hot and cold tap water, run the water until the temperature stabilizes. Fill the glass with water to the level of the masking tape.
  • For ice water, fill the glass about half full with ice cubes (4), then add cold tap water to a bit above the level of the masking tape. Stir for a minute or two so that the temperature equilibrates. Once temperature has equilibrated, remove the ice cubes from the water's surface using a spoon immediately before adding the Alka-Seltzer tablet.

The results of the hot tap water experiment

Trial 1 :

pre water temperature = 64C

dissolve time= 17.80 seconds

Trial 2:

pre water temperature= 65C

dissolve time= 16.06 seconds

Trial 3:

pre water temperature= 65C

dissolve time= 14.29 seconds

Trial 4:

pre water temperature= 65C

dissolve time= 13.72 seconds

average time= 15.4675

What effect does heat have on a chemical reaction? (Alka seltzer tablets)

Materials

1. Alka-Seltzer tablets: 1 tablet for each type of water (hot, cold, and ice). Each type of water gets 4 trials. 12 tablets in total.

2. Thermometer with a range of at least 0 to 60 degrees C

3. Clear drinking glass or jar ( 12 ounce [ 355 mL] or larger)

4. Graduated cylinder, 100 mL

5. Masking tape

6. Something to stir with, a spoon or a chopstick.

7. Hot and cold tap water,12 ounces (for each trial)

8. 4 Ice cubes (per trial for ice water)

9. Stopwatch or a clock or watch with a second hand.

10. A helper

11. Lab notebook

12. Pencil

In conclusion, the hot water had the fastest dissolve time out of the three types of water. The ice water took the longest dissolve time out of the three. My hypothesis was correct, heat did have the fastest dissolve time.

One thing I could of done differently was to have separate 12 ounce glasses for the three different types of water. This would benefit the experiment because the temperatures will stay the same in the different glasses. This also means that I would have consistent answers during each trial.

Cold water

Ice water

The results of the cold tap water experiment

Trial 1 :

pre water temperature = 10C

dissolve time= 1.04.20 seconds

Trial 2:

pre water temperature= 12C

dissolve time= 1.14.37 seconds

Trial 3:

pre water temperature= 12C

dissolve time= 1.13.39 seconds

Trial 4:

pre water temperature= 12C

dissolve time= 1.16.29 seconds

average time= 1.120625

The results of the ice water experiment

Trial 1 :

pre water temperature = 2C

dissolve time= 3.04.94 seconds

Trial 2:

pre water temperature= 1C

dissolve time= 3.12.14 seconds

Trial 3:

pre water temperature= 1C

dissolve time= 3.14.82 seconds

Trial 4:

pre water temperature= 2C

dissolve time= 3.01.98 seconds

average time= 3.0847

4. Prepare the drinking glass with one of the three temperatures as described in step 3. Then measure the reaction time for that temperature.

  • After filling the glass to the level of the masking tape, measure the temperature of the water (in celsius [C]), and record it in the data table in your lab notebook.
  • Remove the thermometer. ( it is not a good idea to use the thermometer as a stirring rod. it might break.)
  • Have your helper get ready with the stop watch, while you get ready with an Alka-Seltzer tablet. Have your hepler count one-two-three. On three, the helper will start the stop watch and you drop the tablet into the water.
  • Stir the water gently and steadily. Use the same stirring method and speed for all of your experiment trials. The tablet will gradually disintegrate. Watch for all of the solid white material from the tablet to disappear.
  • When the solid material has completely disappeared, and the bubbles have stopped foaming, say '' stop!'' to have your helper stop the stopwatch.
  • Record the reaction time ( in second[s]) in the data table in your lab note book.

5. Repeat step 4 three more times with the same temperature.

6. Repeat steps 4 to 5 for each of the other temperatures.

  • When you are done, you should have done a total of four trials for each of the three temperatures.

7. Calculate the average reaction time for each of the temperatures.

8. Make a graph of the average reaction time, in seconds (on the y- axis ), v.s. water temperature, in degrees Celsuis (on the x-axis).

Bibliography

During my experiment, I had help from these websites:

  • http://nces.ed.gov/NCESKIDS/createagraph/default.aspx
  • http://www.sciencebuddies.org/science-fair-projects/project_ideas/Chem_p027.shtml#summary
  • https://prezi.com/

Prepared by:

Evan Irizarry

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