A CIESE Collaborative Project

Spring 2004 Student Reports

New School of Lancaster

Lancaster, Pennsylvania, USA

Based on our graphs we deduced that the elevation was the only variable that had a noticeable effect on the boiling point of water and reasoned that the other variables would affect the time that it took to boil, not the boiling point itself. If we were to do this experiment again we would use less variables. We think that the reason elevation had an impact is that the atmospheric pressure decreases as the elevation increases. This affects the boiling point because at a higher elevation, when there is less atmospheric pressure, there is less energy holding the water particles in place. Therefore, less energy is required to give them kinetic energy, and make the water boil.

 

Michaelhouse School

Balgowan, South Africa

Final Report from Michaelhouse. Location 290 23.945 South 300 02.833 East Elevation 1210 m Grade 8 Subject Area Natural Science The best report for this class is given below with additions/suggestions from other members of the class added to it. The Factor which shows the strongest relationship to the Boiling Point is the altitude. The points plotted on a graph showed this - as the altitude increased the Boiling Point dropped. It was difficult to see relationships in other graphs we plotted. I was not surprised at my results and the other class results because I predicted that it would be the altitude that would be the main factor. It is very important to get accurate measurements because otherwise the point would not be plotted properly, therefore maybe giving the wrong factor. We could have made mistakes measuring when we were reading the thermometers or when we were writing down the results. Most pupils were happy not to consider other variables but some suggestions such as the following were made. I would want to see if at different countries when its night or day or hot or cold it would make a difference. I would like to find out how the purity of water affects the boiling point like maybe the dirtiest water has a different boiling point from not so dirty.

 

Lovell High School

Lovell, Wyoming, USA

We the people of Chemistry 2, of Lovell High School do believe that the cause of water boiling is directly related to the pressure of the gas above the liquid. Elevation is directly proportional to the pressure above the liquid; therefore, the higher in elevation, the lower the boiling point. We believe that the room temperature does not affect the boiling point much. Room temperature would affect the time it took for the water to reach the boiling point. The volume of water does not affect the temperature at which water boils. This is what we have found in our Boil, Boil, Toil and Trouble Lab Experiment.

 

Alice Deal Junior High School

Washington, DC, USA

Results: For the factor graph showing the relationship between room temperature and boiling point, there was no correlation. Most participants had a room temperature between 20 and 25 degrees Celsius. The boiling points, however, varied widely, ranging from around 94 degrees to around 102 degrees Celsius. We concluded that room temperature does not affect the boiling point of water. For the second factor graph showing the relation to volume of water, there was no correlation either. There were many different volumes of water, but the boiling points varied widely for each set. We conclude that volume of water does not affect the boiling point of water as well. For the third graph showing the relation to elevation, we found a negative correlation. For the most part, the elevation stayed between 0 and 400 meters, though there were a few at about 1200 meters. Three of the data points were off track, but overall there was definitely a negative correlation. We concluded that elevation does affect the boiling point of water. For the fourth and final graph showing the relation to heating device, we found that there was no correlation. For the four different heating devices, the boiling point ranged from 98 to 100 degrees. We concluded that type of heating device does not affect the boiling point of water because there wasnt enough of a change between boiling points. Discussion: We found that the factor which had the most effect on the boiling point of water was elevation. We deduced that this occurred because an increase in elevation will lead to a decrease in air pressure. With less pressure on it the water could probably boil faster. After thinking about it, the results of this experiment did not surprise us because it was our class hypothesis and none of the other factors could really affect the boiling point much. Using the data we gathered, we predicted the boiling point in a mountainous state like Colorado. The highest point there is Mt. Elbert at 4, 399 meters high. According to the pattern, the boiling point would be in the mid 80s (Celsius). Our measurements were probably fairly accurate, but we doubt that they were exact. At first, we had some problems because the thermometer was tilting and measuring the temperature of the hot plate instead of the water. We fixed this by attaching a wooden stick to the thermometer. Also, a million other variables affected our results, so its hard to be sure if we got accurate data. Some ways that IBPP could have improved our experiment include giving us more data and insight as to what to do and that there wasnt a lot of variation in the independent variables. Some questions we would still like answered include are there any other factors which affect the boiling point of water? and what kind of data have people got when doing this experiment in the past? Conclusion: We found that the factor which affected the boiling point of water most was elevation. This supports our class hypothesis

 

New Brunswick High School

New Brunswick, New Jersey, USA

We the students from NEW BRUNSWICH HIGH SCHOOL concluded the following: 1. the two factors that affect boiling point is the atmospheric pressure 2.the temperature 3. the elevation based on longitutude and altitudes Our elevation was 80 feet and 24.4 meter above sea level, and one atmosphere of pressure the boiling device was the hot plate the average boiling point was 100 degrees Celsius and the room temperature was 22 degrees celsius. the reaction rate of water as the temperature increased the water vapor has to push harder on the air above it and less pressure caused less air to push out of the way. our system was an open system, therefore we could not measure the variations of pressure and determine the values. Due to our altitude we found the slit decrease in atmospheric pressure, which affected the boiling point, some groups had a boiling point of 98 decrease celsius. We think the cause of the pressure changes was because of the slit of weather patterns that persists at the pole and the affect of cooling the air over the poles.This caused by the weather due to humianity , dry or wet air which we had to experience during last week. Overall this was a great experiement we thank the group leader at stevens institute for providing all the links and we thank our teacher for letting us participate in such experiment over the internet Sincerely Yours NEW BRUNSWICH CP CHEMISTRY CLASS