Rates Of Reaction Investigation
Biology coursework
How does the temperature affect the rate of reaction?
Introduction
For our experiments, I was investigating what affects the rate of reaction. We used Hydrogen peroxide to test the rate of reaction, with the temperature of this being our variable that we changed. Hydrogen peroxide is a clear, colourless liquid which has various amounts of uses within the laboratory, industrial purposes and even in our households. It is mainly used for cleaning products and hair dye but is also used for paper making. Hydrogen peroxide is made up of two oxygen atoms and two hydrogen atoms. The chemical formula for this is H₂O₂.
Catalyse is the enzyme that breaks down hydrogen peroxide which converts the hydrogen peroxide to hydrogen …show more content…
Once again, in order for this test to be improved, I needed to change the time I recorded the results for a better range and use a more precise measuring cylinder for the gas that gets produced. Time (seconds) | 30 | 60 | 90 | 120 | 150 | 180 | 210 | 240 | 270 | 300 | Gas collected (ml) | 0 | 4 | 5 | 7 | 8 | 9 | 10 | 10 | 12 | 13 | Preliminary test 3: For my last test, the graph shows that there was a much better range of results due to fact I increased the surface area of my potato by cutting it into small segments, which had to be of the same size, so the peroxide would completely cover it to ensure the test were fair. I had also recorded the results less often and made the tests longer. …show more content…
The first problem which I had to overcome whilst doing my preliminary was in 2 of the tests which were measured every 10 seconds for a minute, no results were recorded. To stop this happening again, I decided to change the gas collected from 10 to 30 seconds over five minutes. This change was effective in my main test as I then recorded some valid results. Another change I did for my main test was an adjustment to the surface area of the potato. Within my preliminaries I started to use 3 grams of potato but the hydrogen peroxide didn’t completely cover the potato which then caused substandard results. To correct this, I cut the potato into 9 segments with a length if 5mm, a radius of 4mm and a diameter of 7mm so I could have complete coverage of the potato from the hydrogen peroxide, which lead to more accurate results in my main tests. I had also changed the temperature of the hydrogen peroxide for my test from it being lowest at 0°, up to 5°. The reason for this is because we didn’t have the right equipment to reduce the temperature that low, so had to have it at a second choice of temperature. We did this so we could still record results for low temperatures of the hydrogen peroxide, to give us a wider range of
How does the temperature affect the rate of reaction?
Introduction
For our experiments, I was investigating what affects the rate of reaction. We used Hydrogen peroxide to test the rate of reaction, with the temperature of this being our variable that we changed. Hydrogen peroxide is a clear, colourless liquid which has various amounts of uses within the laboratory, industrial purposes and even in our households. It is mainly used for cleaning products and hair dye but is also used for paper making. Hydrogen peroxide is made up of two oxygen atoms and two hydrogen atoms. The chemical formula for this is H₂O₂.
Catalyse is the enzyme that breaks down hydrogen peroxide which converts the hydrogen peroxide to hydrogen …show more content…
Once again, in order for this test to be improved, I needed to change the time I recorded the results for a better range and use a more precise measuring cylinder for the gas that gets produced. Time (seconds) | 30 | 60 | 90 | 120 | 150 | 180 | 210 | 240 | 270 | 300 | Gas collected (ml) | 0 | 4 | 5 | 7 | 8 | 9 | 10 | 10 | 12 | 13 | Preliminary test 3: For my last test, the graph shows that there was a much better range of results due to fact I increased the surface area of my potato by cutting it into small segments, which had to be of the same size, so the peroxide would completely cover it to ensure the test were fair. I had also recorded the results less often and made the tests longer. …show more content…
The first problem which I had to overcome whilst doing my preliminary was in 2 of the tests which were measured every 10 seconds for a minute, no results were recorded. To stop this happening again, I decided to change the gas collected from 10 to 30 seconds over five minutes. This change was effective in my main test as I then recorded some valid results. Another change I did for my main test was an adjustment to the surface area of the potato. Within my preliminaries I started to use 3 grams of potato but the hydrogen peroxide didn’t completely cover the potato which then caused substandard results. To correct this, I cut the potato into 9 segments with a length if 5mm, a radius of 4mm and a diameter of 7mm so I could have complete coverage of the potato from the hydrogen peroxide, which lead to more accurate results in my main tests. I had also changed the temperature of the hydrogen peroxide for my test from it being lowest at 0°, up to 5°. The reason for this is because we didn’t have the right equipment to reduce the temperature that low, so had to have it at a second choice of temperature. We did this so we could still record results for low temperatures of the hydrogen peroxide, to give us a wider range of