17.1_ESPOLONG-GARGACERAN-MAAGMA_Laboratory Report 3.docx

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Experiment No. 3 Chemical Kinetics Chem 17.1 Section 2 AY 2018-2019 Espolong, Joyce Therese Feihazel D Gargaceran, Angelica Thea F. Maagma, Mary Abbygail P. March 15, 2018
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Abstract Reaction is a chemical change that converts reactants- element or compound - to produce products. Reaction takes place in a certain speed to convert reactant(s) to products, which is called reaction rate. Reaction rate is a part of chemical kinetics which investigates the factors affecting the rate of chemical reaction. In the experiment conducted, we observed chemical kinetics such as the effects of nature of reactants, concentration, temperature, surface area, presence of catalyst, and the order of reaction. Based on the results, nature of reactants’ affects the rate of reaction through the reactant(s) bond type, bond strength, and state of matter. Another factor was concentration, observed that as concentration increase, the number of particles increase, and so is the collision that makes the reaction rate faster. Temperature affects the kinetic energy and the collision rate of the particles, so when the temperature increase, the rate of reaction increase. Surface area (where to make collision) shows that as it increases the reaction rate increase. Presence of catalyst increase the reaction rate as it lower down the activation energy needed for a reaction. Chemical Kinetics is useful in manipulating the reaction rate for optimum time for a reaction, for the maximum obtainable conversion, and to maintain the most desirable temperature range. 2
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Introduction Processes by which substances are transformed to one or several products are called chemical reactions. Chemical processes that occur in the presence of light, like sunlight, are called photochemical reactions. These processes can occur naturally or under controlled conditions in the laboratory. Chemical kinetics is the study of rates of reactions and their mechanisms. The rate of reaction is measured by the change in concentration per unit time of a substance, reactant or product. If we know the rate law and the constants in it we can use this to predict the rate for any set of concentrations. The form of the rate law can tell us something about the mechanism of the reaction. Knowing the rate law enables us to separate the concentration dependence from the underlying, fundamental effect which is the size of the rate constant. The objective of this experiment is to identify how factors such as nature of reactants, concentration, surface area, temperature, and presence of catalyst influence chemical reactions rates and to determine the order of the reaction. Methodology Nature of Reactants The students’ prepared two 15 mL test tubes then placed enough 3.0 M CH 3 COOH and 3.0 M HCl to fill 1/3 of the test tubes, respectively. The gas evolved was tested by using a lighted splinter while placing a one spatula-full of iron fillings to the HCl. Do the same to the CH 3 COOH. The changes observed and gathered were then recorded.
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  • Spring '19
  • Herlene Mae Cantores
  • Chemical reaction

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