10 Chem Rate Of Reaction Lab Sam

Sammy Shockley, Kayla Brown March 26th 2008 Period 3 Chemistry Temperature VS Rate Reaction Question: How does the temperature of water affect the rate of reaction? Hypothesis: If the temperature increases then the rate of reaction will increase because molecules speed up in heat therefore speeding up the reactions. Experimental Design:

Control- Water at room temperature (35oC)

Experimental 1- 70oC

Experimental 2- 25oC

Experimental 3- 10oC

-Water at Room Temperature(35oC) -Beaker -Test tube -Gradated cylinder -Time (30 seconds) -Stop Watch -Rubber Cord -Amount of Magnesium -Eye dropper and stopper - Thermometer

-Water at 70 degrees Celsius -Beaker -Test tube -Gradated cylinder -Time (30 seconds) -Stop Watch -Rubber Cord -Amount of Magnesium -Eye dropper and stopper -Thermometer

-Water at 25 degrees Celsius -Beaker -Test tube -Gradated cylinder -Time (30 seconds) -Stop Watch -Rubber Cord -Amount of Magnesium -Eye dropper and stopper -Thermometer

-Water at 10 degrees Celsius -Beaker -Test tube -Gradated cylinder -Time (30 seconds) -Stop Watch -Rubber Cord -Amount of Magnesium -Eye dropper and stopper -Thermometer

ECC: Water Temperature MV: Amount of bubbles and water left in the graduated cylinder,

RV: CV: Beaker/container, test tube, gradated cylinder, amount of magnesium, Trials: Four sets of four

Procedure: 1. Gather all clean materials. 2. Set up procedure; put 4 mL of HCl in the test tube. 3. Heat water to seventy degrees and place test tube with HCl in it. 4. Place a graduated cylinder with H2O and food coloring in it, in the other beaker /container (top facing the bottom.). 5. Place rubber tubing’s open side under the graduated cylinder. 6. Drop a centimeter of magnesium in the test tube and plug it with the stopper hooked to the other end of the rubber cord. 7. Start timer 8. Count the number of bubbles that appear and go into the graduated cylinder until the 30 seconds is up. 9. Record number of bubbles. 10. Check the graduated cylinder and see how much water was pulled out during the experiment, record that data. 11. Repeat steps 2-10 three more times. 12. Then repeat experiment with the water at 10, 25, and 35 degrees. 13. Record data on the different temperatures and its affect on rate of reaction. 14. Repeat the entire procedure four times for each temperature to ensure the validity of your results. 15. Clean up materials. Data and Observations: Temperature 10 o 10 o 10 o 10 o 25 o 25 o 25 o 25 o 35 o 35 o 35 o 35 o 70 o 70 o 70 o 70 o

Time 30 sec 30 sec 30 sec 30 sec 30 sec 30 sec 30 sec 30 sec 30 sec 30 sec 30 sec 30 sec 30 sec 30 sec 30 sec 30 sec

Bubbles 8 6 7 6.5 17 14 19 17 25 27 25 24 53 50 51 54

mL 1 1 2 1 4 3 5 4 6 5 6 7 11 13 12 11

Graphs: Control Group

Experimental 1

Experimental 2

Experimental 3

Amount of Bubbles 25 27 25 24

Temperature 35 35 35 35

53 50 51 54

Temperature 70 70 70 70

17 14 19 17

Temperature 25 25 25 25

8 6 7 6

Temperature 10 10 10 10

Amount of Bubbles

Amount of Bubbles

Amount of Bubbles

Control Group

Amount of Bubbles and Temperature

Control Group 40 35 30 25 20 15 10 5 0 1

2

3

4

Trials Control Group

Amount of Bubbles

Temperature

Experimental Group 1

Amount of Bubbles and Temperature

Experimental Group 1 80 60 40 20 0 1

2

3

4

Trials Experimental 1

Amount of Bubbles

Temperature

Experimental Group 2

Amount of Bubbles and Temperature

Experimental Group 2 30 25 20 15 10 5 0 1

2

3

4

Trials Experimental 2

Amount of Bubbles

Temperature

Experimental Group 3

Amound of Bubbles and Temperature

Experimental Group 3 12 10 8 6 4 2 0 1

2

3

4

Trials Experimental 3

Amount of Bubbles

Temperature

Interpretation and Conclusion Our hypothesis was correct. As the temperature increased in each trial, the amount of bubbles created also increased. The highest amount of bubbles created was 54 bubbles when the water was at 70 degrees. The lowest amount of bubbles was 6 bubbles when the water was at 10 degrees. These high and low data points show that the higher temperature yields more bubbles. One source of error is that at some point during the experiment, the bubbles came out of the rubber tube quickly and it was easy to miscount the bubbles. Another source of error is that the temperature of the water wasn’t always exactly at the temperature that was desired. Lastly, when we were tipping the water filled granulated cylinder and submersing it into the beaker with water, some water might’ve escaped from the granulated cylinder changing the results of the leftover water.