Science Fair Projects

Temperature's Effect on the Collision Rate Factor


The objective: I wanted to do something useful for society. I had no trouble choosing a topic, as my head is always full of questions. Being more interested in chemical kinetics, I went beyond the ordinary high school textbook, and found the Arrhenius Equation. The Arrhenius Equation inspired me to see if there was an equation for the Z-collision rate factor (a variable in the Arrhenius Equation). I had a feeling that somehow Z and temperature were related, and hypothesized a directly proportionality between Z and temperature. I prepared my procedures accordingly.


I used HCl and NaOH at dilute concentrations and small volumes for safety and to conserve resource. I used a pH probe, a magnetic stirrer, and a CBL. (I used the CBL to collect and to transfer the data to a TI 82) There were many challenges at first, things that seem as insignificant as how fast you pour the NaOH or where you pour it had a drastic effect on the data.


In the end, I obtained data for 10oC, 23oC, 40oC, 60oC. Data were in the form of pH over time, so I had to convert it to [H+] over time, and then to rate of reaction over time, then to rate constant over time, then finally to Z over time. I averaged the Z at each temperature, and ended with an unique Z for each of the temperatures.


After trying equation after equation, I decided that the data points are best represented by Z = 24.4 t^(1/2), where t is temperature in degrees Celsius. Original hypothesis rejected.

This project is to find a causation between temperature and the z-collision rate factor.

Science Fair Project done By Isaac F. Ho


Related Projects : Does the Temperature of a Magnet Affect Its Strength, Zero Gravity Elevator Experiment, Cold Nuclear Fusion, What Didge You Hear, Effects of Soap, Salt, and Temperature , Orange You Glad You Have Vitamin C, Effect of Water and Temperature in Varying the Toxicity, C The Juice, Acid Ice: The Effect of pH on the Freezing Point of Water, Counterfeit Attack, Do Oranges Lose or Gain Vitamin C After Being Picked, Abating Acid Rain, Which Orange Juice Contains the Most Vitamin C, Borax Acts or Gets the Ax, Corrosion and Conductivity, Apple Dehydration, The Focalization of Sound, Specific Heat in Materials, Quantifying the Effect of Tungsten Illumination on Color Rendering of Low-Pressure Sodium, Color vs. Heat Absorption


<<Back To Topics Page........................................................................................>> Next Topic



Copyright © 2013 through 2015