I did this because the cylinders are near enough 3 grams of potato that we needed. Catalyst- This is a substance which alters the rate of a chemical reaction but is chemically unchanged at the end of the reaction. Temperature- When you increase the temperature, the rate of reaction also increases.
When this happens, two chemicals react and their molecules have to collide with each other with sufficient energy for the reaction to take place.
Concentration- If the concentration is greater there is a higher chance that molecules will collide and speed up the rate of the reaction. I will then repeat each test 4 times to make it fair and accurate, then giving me reliable results to evaluate later on.
After you have placed the potato into the flask, you need to place the bung this is on the end of the delivery tube on the top of the flask 9.
This gave us accurate results for the gas collected. By heating this, you will increase the energy levels of the molecules involved in the reaction. We did this to make our results accurate. This variable gave us plenty of results that were reliable as well as accurate.
Because catalysts work so rapidly and are used again and again, it is only necessary to have very small quantities of catalyst present to make a chemical reaction go faster.
This enzyme is a protein which speeds up the rate of the chemical reaction, every enzymes does this. Next you need to manoeuvre the delivery tube under the measuring cylinder in the water bath. Increasing the surface area will increase the chances of collisions that will take place.
I will test the gas that is collected through the experiment every 30 seconds, for 5 minutes. I chose to change the temperature of the hydrogen peroxide our preliminary test showed us it would be the best possible way to test the rate of reaction.
This gives me enough data allowing me not to repeat any more of the tests. These two molecules will only react if they have enough energy. First of all, you need to select a potato for you tests and extract cylinders of potato using a core borer.
The catalyse that we used is potato, and is the enzyme that I used in the experiment. If it a less concentration, there will be fewer collisions and the reaction will probably happen at a slower speed. The chemical equation for this reaction is: Surface area- If the potato we used was blended or cut into fine pieces the reaction would have occurred quickly.
These should all roughly be the same size. Start timing with the stopwatch straight away and record the ml decrease of gas every 30 seconds. You must repeat each temperature 3 times.
This example would produce a faster reaction than a large solid, with the same mass but a larger surface area. When the concentration is higher, the chances of collisions are greater. You now need to place the pieces of potato that you just cut up into the conical flask without misplacing any of them as it may lead to inaccurate results.
You must make sure that the potato is the same weight for each experiment to make you fair, accurate and reliable. There were various amounts of variables that we could have changed for our experiment.
This was decided because it allows the solution to react quickly enough. Experiment diagram Initial method Throughout my experiment, I will only be changing one variable for my tests, which will be the temperature of the hydrogen peroxide.
For reactions that involve gases or liquids, when you increase the concentration of the reactant, the reaction rate also increases. This will then lead to a higher volume of gas that gets produced, but if the temperature increases too much, it will cause the results to level off and then the enzyme will denature.
Increasing the temperature means the molecules move faster. Stop timing and recording results after 5 minutes. You then have to cut the potato into 9 segments, with a length if 5mm, a radius of 4mm and a diameter of 7mm so you can have complete coverage of the potato, from the hydrogen peroxide.
There are four different variables that I could have changed to lead to the rate of reaction being affected: Hypothesis I predict that when the temperature of the peroxide is increased,the reaction will occur a lot quicker.
Everyone one participating on the experiments had to make sure their hair was tied back and any jewellery was removed. What can affect the rate of reaction?If it were an endothermic reaction, the temperature would lower, because the reaction is using up more energy breaking the bonds, this is noted and a temperature change, this time, showing how temperature decreases.
The acid and alkali compounds dissolve into water, acid into hydrogen ions, and alkali in hydroxide ions. I am going to see how long it will take the Calcium carbonate to neutralise the acid at different temperatures, I am going to see what will happen to the speed of reaction when I change the temperature, and then I will see.
* Guiding Question: How does the change in temperature affect the rate of reaction? * Objectives: The objective of this experiment is to see how temperature affects reaction rates. * Hypothesis: We think that temperature increases the rate of reaction because the increase in temperature increases the energy of the particles and therefore overcomes.
As you increase the temperature the rate of reaction increases. As a rough approximation, for many reactions happening at around room temperature, the rate of reaction doubles for every 10°C rise in temperature.
The Effect of Temperature on the Rate of Reaction Words | 6 Pages. The Effect of Temperature on the Rate of Reaction Aim-We is going to investigate how temperature effects the rate of reaction when we use a Magnesium Ribbon and dissolve it in Hydrochloric Acid. This enzyme is a protein which speeds up the rate of the chemical reaction, every enzymes does this.
There were various amounts of variables that we could have changed for our experiment. These variables were: to put in a catalyst, to change the surface area of the catalyse, the temperature and the concentration of the hydrogen peroxide.Download