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5 factors affecting rate of reaction
5 factors affecting rate of reaction
5 factors affecting rate of reaction
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Introduction
The purpose of this experiment is to gain an understanding of factors which influence the rates of reactions. Several experiments will be conducted using various combinations of concentrations of the reactant (hydrogen peroxide) and a catalyst (potassium iodide), as well as one pairing in which a change in temperature is the only variable. Data collected will be used to determine the rate law, rate constant, and activation energy for each of the reactions Hydrogen peroxide (H_2 O_2) naturally decomposes into water (H_2 O) and oxygen gas (O_(2 )) according to the following balanced equation.
2 H_2 O_2 (aq) ↔ 2 H_2 O (l)+O_(2 ) (g)
Normally this reaction takes a long period of time, but the rate of reaction can be increased with the addition of a catalyst, which lowers the activation energy needed for a reaction to begin, but is not consumed in the reaction. In this experiment, potassium iodide (KI) will be used:
2H_2 O_2 (aq) □( □(↔┴KI )) 2 H_2 O (l)+O_(2 ) (g)
It is expected that the reaction will not occur at a significant rate until the addition of the catalyst.
The rate of a reaction can be expressed as the change in concentration of either reactants or products divided by the change in time, and will decrease as the reaction progresses(Chang 558).
rate= -1/2 (∆ [H_2 O_2])/(∆ t)= 1/2 (∆ [H_2 O])/(∆ t)= (∆ [O_2])/(∆ t)
A reaction’s rate is proportional to the concentration of the reactant, and the value of this ratio (called the rate constant, k) remains the same throughout the reaction, regardless of concentration. Only a change in temperature will change the rate constant for a given reaction. It is hypothesized that an increase in temperature will result in an increase in the value of ...
... middle of paper ...
...f just H2O2 without the catalyst as a negative control may have provided concrete data for comparison in the rates of reaction, supporting the hypothesis that the catalyst would initiate the reaction
Conclusion
In completing this experiment I gained a better practical understanding of the effects of temperature, concentration, and catalysts on rates of reaction. A solid understanding of how catalysts function, especially in biological systems as enzymes, will serve me well when I am a physician assistant. Chemical reactions are taking place all around us; the realization of how occur and how they can be manipulated will be of benefit in many ways, from maintaining safe pool water, to making gravy, to coloring hair…better understanding will lead to success.
Works Cited
Chang, Raymond. Chemistry. Boston: McGraw-Hill Higher Education Publishing, 2009.
For example, a balanced chemical equation of a certain reaction specifies that an equal number of moles of two substances A and B is required. If there are more moles of B than of A, then A is the limiting reactant because it is completely consumed when the reaction stops and there is an excess of B left over. Increasing the amount of A until there are more moles of A than of B, however, will cause B to become the limiting reactant because the complete consumption of B, not A, forces the reaction to cease. Purpose
3. The higher the concentration of the enzyme the more there are to catalyze the reaction. Taking information from graph 1 (change in mL of enzyme), the more mL of enzymes that there are the faster the reaction rate is. It would increase until there was no substrate left available for a reaction.
The Effect of a Catalase on the Breakdown of Hydrogen Peroxide Aim To follow the progress of a catalysed reaction by measuring the volume of gas produced as the reaction proceeds. Using the initial rates of a series of experiments I will be able to find the orders of the reaction with respect to enzyme and substrate. Also to find out if concentration has an effect on the reaction when an enzyme is used to accelerate the breakdown of hydrogen peroxide.
will result in an increase in the speed of the rate of reaction it has
Objective: The objective of the experiment is to determine what factors cause a change in speed of a reaction. It is also to decide if the change is correlated with the balanced equation of the reaction and, therefore, predictable. To obtain a reaction, permanganate, MnO_4^(1-), must be reduced by oxalic acid, C_2 O_4 H_2. The balanced equation for the reaction is:
In this lab, it was determined how the rate of an enzyme-catalyzed reaction is affected by physical factors such as enzyme concentration, temperature, and substrate concentration affect. The question of what factors influence enzyme activity can be answered by the results of peroxidase activity and its relation to temperature and whether or not hydroxylamine causes a reaction change with enzyme activity. An enzyme is a protein produced by a living organism that serves as a biological catalyst. A catalyst is a substance that speeds up the rate of a chemical reaction and does so by lowering the activation energy of a reaction. With that energy reactants are brought together so that products can be formed.
The aim of this experiment was to investigate the affect of the use of a catalyst and temperature on the rate of reaction while keeping all the other factors that affect the reaction rate constant.
Refer to Chemistry Lab # 2 – Investigating Changes. No changes have been made in this experiment. Methods = == ==
This is the first reaction in the Harcourt Essen experiment. The iodine is oxidised to produce I2 wh...
this, and the. [ IMAGE] The graph shows that the concentration of hydrogen peroxide is increased, the more oxygen is given off. This is because there is more
* Amount of acid – if there is more acid the rate of reaction will
You can speed up the reaction by stirring the solution. 8. You can also change the rate of the reaction by adding a catalyst, which is something that speeds up the reaction. In my experiment I will change the temperature of the hydrochloric acid. I will not change anything else; I will keep the amount of calcium carbonate, the form of calcium carbonate, the concentration of hydrochloric acid, the surface area of the calcium carbonate and the amount of hydrochloric acid all the same.
In essence, the main objective was to use chemical titration to measure and then calculate the rate of conversion of hydrogen peroxide (H2O2) to water and oxygen by using the enzyme catalase. Other purposes of the lab were; to measure the effects of changes of temperature, pH, enzymes concentration, and substrate concentration on rates of an enzyme. The lab was also an opportunity to see a catalyzed reaction in a controlled experiment. And the last objective was to learn how environmental factors affect the rate of enzyme catalyzed reactions.
Investigating the Effect of the Enzyme Catalyse On Hydrogen Peroxide Introduction The aim of this experiment is to determine the effects of varying enzyme (catalyse) on Hydrogen Peroxide. Hydrogen Peroxide + Catalyse à Water + Oxygen 2H2O2 à H2O + O2 + Heat Apparatus & Diagram [IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE] Bung Potato Hydrogen Peroxide Water Collected Oxygen Delivery Tube Measuring Cylinder [IMAGE] Using the Equipment Safely It is important that we use the apparatus carefully, as safety will be an issue throughout the whole experiment. We will wear goggles and an apron or lab coat to protect our eyes and clothes. As we are using enzymes and Hydrogen Peroxide we need to be extra careful, ensuring they don't come into contact with our eyes, skin or clothes. Catalyse is an enzyme found in all living cells.
We have no gases and solids involved, therefore it is easy to deal with solutions. Similarly, the use of a catalyst complicates things, and if used incorrectly could alter the outcome of the experiment. The theory behind this experiment is that increasing the concentration can increase the rate of the reaction by increasing the rate of molecular collisions. GRAPH I will place the reaction mixture on a paper with a black cross drawn on it. When the cross is completely obscured, the reaction will be finished.