The Effect Of Concentration On The Rate Of Reaction

However, the results of this experiment may not have been as accurate or precise as they

Which of the following conclusions is most valid, given the results of experiment 1? 6-8.2

This lab was not repeated to examine for consistent results, which may result in data where precision and accuracy are compromised. In this investigation,

This experiment did not include exact values, rather, used observations as a source of data collection and comparison. Therefore, using measurements would be better to compare the exact changes that occurred as a result of the manipulation of variables. This would require more expensive and precise tools, but if it was feasible, would improve the reliability of the results.

In this experiment we tested the effects that enzymes and substrate have on chemical reaction rates, which is the rate at which chemical reactions occur.. This experiment tested how different concentrations of enzyme and substrate affected the light absorption measurements on a spectrophotometer. The experiment also tested how temperature affected the light absorption, and in a separate test, the effect of the enzyme inhibitor hydroxylamine was also tested. In the first test conducted, 3 different concentrations of enzyme, and three different concentrations of substrate were measured in a spectrophotometer. For the enzyme and the substrate, the measurements got higher as the concentrations were higher, but the over measurements of the substrate were smaller than those of the enzyme. In the second test conducted, the medium concentration enzyme was tested under the temperatures; 4°C, 23°C, 37°C, and 60°C. The measurements in this test got higher as the temperature got higher, but did the measurements under 4°C were overall significantly higher than the other temperature measurements. Lastly, the last test conducted showed that the measurements of the substance with 0 and 1 drop of hydroxylamine inhibitor went up, but the measurements of the enzyme with 5 drops of hydroxylamine inhibitor stayed rather low and did not change much. In conclusion, these experiments showed that chemical reaction rates are sped up with higher concentrations of enzyme, substrate,

Hypothesis: If the concentration of a substrate increases, any time an enzyme happens upon a substrate it will be free to help that substrate react, but then when an enzyme encounters a new substrate at a slightly higher concentration it will already be working on another substrate, therefore, as we increase substrate concentration it is not going to increase as fast as the reaction rate.

I am doing this experiment to find out how I can speed up the reaction rate between calcium carbonate and hydrochloric acid.

The rate of a chemical reaction often depends on reactant concentrations, temperature, and the presence of a catalyst. Additionally, the rate law is determined mathematically only from experimental data. The reaction investigated in this experiment is:

Review 3: Text Chemical kinetics is the study of rates and mechanisms of chemical reactions. In our study of chemical kinetics, experimental data identifying the initial concentrations of reactants and the instantaneous initial rates of multiple trials is used to determine the rate law for the reaction, the order of the reactants, the overall reaction order, and the average rate constant. By comparing the instantaneous initial rates and the initial concentrations of the reactants for two trials, it is possible to deduce the order of each reactant. In order to determine the order of A, the two trials must be selected such that the concentration of A changes while the concentration of B is held constant.

Part 2 of the experiment produced an average maximum temperature of 70.3 ⁰C. Part 4 had an average of 77.8 ⁰C and Part 5 had an average of 76.9 ⁰C. These differences could have been clarified by having more trials. Conducting more trials would improve this experiment, in that there would be less percent error due to the more accurate averages. Part 1 of the experiment appears to be an outlier, because its results were not half that of the other parts of the experiment. This could be a source of error. It is undetermined whether this major difference was due to random or systematic error.

Another reason why results may have varied from group to group could be due to miscalculations and human error while performing dilutions. Dilutions is a very important part of the experiment and if there was an error in one simple dilution then it could have carried on from tube to tube having detrimental effects on the concentrations of the solution being created.

This experiment shall be repeated twice or more to enhance accuracy of the results obtained. Besides detecting systematic errors, this experiment would aid on the technique and understandings to the correct use of these equipments.

Two catalyst reactants are used in the experiment, thiosulfate and starch, to dictate the time of reactions.

Constant Variable: The constant variable in this investigation will be the temperature, pressure, concentration, catalyst, and the amount of the reactants used. This is because, these are some of the other factors, which affect the rate at which a reaction occurs. A rise in temperature will result in an increased rate of reaction and vice versa. This is because the energy in the particles, which will react, will have higher energy resulting in a higher frequency of effective collisions to take place. An increase in concentration and pressure will also increase the rate of reaction. This is because, the reacting particles become more crowded resulting in an increased chance of particles colliding. A catalyst is a substance that speeds up a reaction without itself being used up. The amount of both the reactants will also be kept constant by using the same mass of the ribbon/stripe for

The use of a catalyst affect reaction rate by lowering the reaction enthalpy making the proportion of successful collisions higher.