Put all the liquids down the drain and rinse out jars throughouly with water. Reactions that appear similar may have different rates under the same conditions, depending on the identity of the reactants. Repeat step 9 with the Alka-Seltzer tablet completely crushed into powder. As the reaction returns, a all right precipitate of sulfur signifiers, which makes the H2O go cloudy. After the fact one of my colleagues pointed out that I could shade one side darker and then print out on just white paper which is another great idea. The changing concentrations of Potassium Iodide. The presence of a catalyst increases the rate of a reaction by lowering its activation energy.
Describe what happens to the reaction. The controlled variables are the amount of hydrogen peroxide and the amount of each catalyst. In other words, by placing a crushed tablet in a beaker of water, there will be more surface contact between the tablet and the water, which will result in a higher reaction rate. For this lab the materials we used were pipettors and tips, 10 mL graduated cylinders, large test tubes, test tube racks, corks and timers. For example, a sodium acetate solution reacts with methyl iodide in an exchange reaction to give methyl acetate and sodium iodide. Therefore, the higher the temperature, the larger the rate of reaction.
Higher temperature increases the rate of the reaction. Repeat steps 1-3, instead with a crushed tablet and a chunked tablet. The online simulations is a great tool to discuss the factors, which can increase a reaction rate, and to demonstrate particle behaviors as those factors are applied. However, in order for the collisions to be effective, the particles must collide with sufficient energy activation energy. The more particles there are the easier it is to find a particle to collide with, which increases the time it takes for the reaction to occur. Some of them being Pressure if the reactants are Gases , Temperature, Presence of a Catalyst, Surface Area of the reactant, and Concentration. By increasing surface area, there are more collisions per unit of time.
We made sure the amount of sodium carbonate put in each beaker are the same and the temperature of the solution were same. If you've ever started a camp fire, you know that small wood shavings are more easily lit than large logs. Solution A contained; water, 0. The collision energy depends directly on the kinetic energy of colliding particles, and temperature is a measure of the average kinetic energy of the particles in a substance. The warmer the temperature, the faster food spoils.
Although the experiment was successful in showing the relationship discussed above, there are a few errors associated with this experiment that could have hindered the accuracy of the results. Some of them being Pressure if the reactants are Gases , Temperature, Presence of a Catalyst, Surface Area of the reactant, and Concentration. In other cases, we want reactions to proceed slowly, such as the corrosion of car parts or aging. The reaction produces a gas, so the reaction rate can easily be determined by measuring the amount of gas released as the reaction proceeds. You can change the concentration of a gas by adding more gas to a fixed volume or by decreasing the volume of the container.
How are the molecules moving or acting? We controlled the temperature of water, the amount of water and the amount of tablets but changed the surface area by cutting the tablet into chunks and crush it. The reactions between ionic compounds in water occur very fast as they involve only exchange of ions, which were already separated in aqueous solutions during their dissolution. Conversely, the reaction rate of virtually all reactions decreases with decreasing temperature. These two theories justify the corresponding increase of both factors. This time, increase the initial temperature until, on the graph, the total average energy line is completely above the potential energy curve.
A camp fire bums at a certain rate in air where the concentration of oxygen: is only about 20% by volume. Make sure to clean the magnesium with the sandpaper before weighing it, in order to remove any impurities. Nature of Reactants: a The independent variable in the reaction was the type of metal used. Furthermore, the particles must collide with the proper orientation. Record the time it takes for it to completely dissolve. Smaller surface area reactants turn to product at a slower rate.
That's because the ionic bonding in each reactant is strong and the ions in each compound are hard to separate from each other. Chemical reactions occur when molecules collide with each other and undergo a chemical transformation. The observations prove that less surface area contact between the reactants does decrease the rate of reaction, and that a higher reaction rate occurs when the surface contact increases. The more frequent the collisions, the faster the rate of the reaction. Part 1: Effect of Temperature Purpose: To understand how temperature affects the rate at which the Alka Seltzer tablet dissolves.