How does heat Affect chemicals ? By Latif

Hypothesis If UV beads are placed in hot temperature then the change of colors will happen much faster.

Materials Styrofoam TM cups Permanent marker UV beads Stopwatch Thermometer Lab notebook Microwave oven Graph paper water

Dependent and independent variables The dependent variable is the color UV beads and independent variable is the temperature of the water.

Procedure (part1) 1.Perform this experiment when there is sunlight outside. 2.Label the Styrofoam cups 1, 2, 3, and 4 with the permanent marker. 3.Place 10 UV beads into each Styrofoam cup 4.Add 250 mL of water to each cup, using the following temperatures: ◦Cup # 1: Lukewarm water (20 degrees Celsius) ◦Cup # 2: Ice water (below 0 degrees Celsius) ◦Cup # 4: Hot water

Procedure (part 2) 5.Start the stopwatch immediately after bringing the UV beads back inside. 6.Observe how long it takes the UV beads to lose their color. 7.Compare the colors in the UV- exposed beads to the beads in cup # 1 . 8.In your lab notebook, record the time at which the beads in cups 2, 3, and 4 lose their color and look like the beads in cup #1. 9.Repeat steps 3–8 two more times . This will show that your results are reproducible.

Data temperature Reaction Hot (70) Transforms in 1 minute and 23 seconds Cold (-25) Transforms in 3 minutes and 34 seconds Normal(0) transforms in 1 minute and 56 seconds

The reaction didn’t stay constant every time I tried the experiment.

Conclusion when you put UV beads in a place that is hot , the reaction happens much faster then it would in a place that’s cold .

Bibliography http://www.sciencebuddies.org/science-fair-projects/project_ideas/Chem_p088.shtml http://www.astronomynotes.com/starsun/s3.htm