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Chemical reaction Essay Topics & Paper Examples

Looking for Alabrandi and the Simple Gift

Good morning teachers and fellow students. The idea that we continue on as we are: unchanged, unchanging is unbelievably illogical. In a time and world where things are constantly changing, it is impossible to be in existence without being affected by the process of change. Changes are inevitable, and they are happening everywhere around us. This idea is portrayed in the Prescribed film “Looking for Alibrandi” and my ORT The Simple Gift by Steven Herrick. The meeting of two personalities is like the contact of two chemical substances if there is a reaction, both are transformed. This quote by Psychologist Carl Jung is clearly evident in both texts looking for Alibrandi and The Simple Gift. During the opening scene of…

Exothermic and Endothermic Reactions

The release of energy in chemical reactions occurs when the reactants have higher chemical energy than the products. The chemical energy in a substance is a type of potential energy stored within the substance. This stored chemical potential energy is the heat content or enthalpy of the substance. The collection of substances that is involved in a chemical reaction is referred to as a system and anything else around it is called the surroundings. If the enthalpy decreases during a chemical reaction, a corresponding amount of energy must be released to the surroundings. Conversely, if the enthalpy increases during a reaction, a corresponding amount of energy must be absorbed from the surroundings. This is simply the Law of Conservation of…

Lab report on enzyme activity

Enzymes are a protein serving as a catalyst, a chemical agent that changes the rate of the reaction without being consumed by the reaction. Enzymes are proteins made up of long chains of amino acids. These form complex shapes. The enzymes are individuals, like the different players on a ball team, they have different specific structures and jobs. As one ball player may be very tall and one short, the specific different shape of the active site on an enzyme is unique and prepares it to mix with a certain substrate. Without enzymes, the process of metabolism would be hopelessly slow. The reactant an enzyme acts on is referred to the enzyme’s substrate. The enzyme will combine with or to…

Calorimetry and Hess’s Law

Elemental magnesium is one of the principal components of flares used to illuminate nighttime activities, or to aid in signaling one’s location to aircraft and ships. Your instructor may ignite a strip of magnesium ribbon to demonstrate the combustion of magnesium in air. It will be evident that a great deal of light energy is released from this reaction. A direct method for measuring the heat produced by this reaction would be difficult, so we shall resort to an indirect method in this experiment as discussed below. Some chemical reactions (including the one above) are associated with the evolution of thermal energy and are called exothermic reactions. When there is absorption of energy in a chemical reaction, the process is…

Data observation

Complete a data table that includes a prediction of reaction type (single replacement, double replacement, synthesis, decomposition, or combustion), observations, and identification of reaction type for each reaction in the lab. (10 points) Reactants Prediction of Reaction Type Observations Reaction Type Iron (III) and copper (II) sulfate solution single replacement Solids stay concentrated at the bottom Single replacement Lead (II) nitrate and potassium iodide solutions Double replacement Yellow colored powder collected at the bottom Double replacement Magnesium metal and hydrochloric acid solution Single replacement The solution began to fizz. Proves to be flammable. single replacement Electrolysis of water decomposition The water bubbles In the tubes filled with H2 and O2 decomposition Burning magnesium combustion As the magnesium comes in contact…

Why Should We Study Chemistry

Why should we study Chemistry? Well I’ll tell you why I think I would study Chemistry, why it’s so important and crucial to know and understand. A couple reasons why are that I want to become a doctor in the future, I can see Chemistry in life, and I want to make a difference in the world. Can’t you agree that Chemistry is everywhere you look, I would definitely say so? Clearly, then we can see Chemistry in our daily lives. Just stop and look around you sometime. Look at a car for instance, you car runs off of chemicals petroleum chemist came up with. Those chemicals are used to create the gasoline you would use to operate a car…

Reaction Order and Rate Law

Data, Calculations, and Questions A. Calculate the initial and final concentrations as needed to complete Tables 1 and 2. Data Table 1: Varying the Concentration of 1.0 M HCl | | | | |Concentrations | | |# Drops |# Drops |# Drops |Initial | |# Drops |# Drops |# Drops |Initial |Initial |Final |Final |Reaction Time (sec) |Reaction | |Well # |HCl |Water |Na2S2O3 |HCl |Na2S2O3 |HCl |Na2S2O3 |Trial 1 |Trial 2 |Avg |Rate (sec-1) | |1 |8 |0 |12 |1 M |0.3 M |0.4 |0.18 |18.4 |16.3 |17.35 |0.0576 | |2 |8 |6 |6 |1 M |0.15 |0.4 |0.0045 |37.1 |37.9 |37.5 |0.0267 | |3 |8 |8 |4 |1 M |0.1 |0.4 |0.02 |107.2 |106.6 |106.9 |0.0093 | |…

Chemical Reaction

Chemical Reactions Lab Objectives: 1. To examine a variety of reactions including precipitation, acid-base, gas forming, and oxidation-reduction reactions. 2. To identify the products formed in these reactions and summarize the chemical changes in terms of balanced chemical equations and net ionic equations. 3. To identify the species being oxidized and reduced in oxidation-reduction reactions and determine which species is the oxidizing agent and the reducing agent. Chemical equations represent what occurs in a chemical reaction. For example, the equation HCl (aq) + NaOH (aq) → NaCl (aq) + H2O (l) describes an acid-base reaction, a type of exchange reaction in which the driving force is the formation of water. In an exchange reaction, the anion of one reactant changes…

Thermochemistry Laboratory Report

Abstract The purposes of these three experiments are to determine the heat capacity of a calorimeter and with that data, confirm Hess’s Law and observe enthalpy changes within reactions. By measuring the change in temperature that occurs with the interaction of two different reactants, we were able to determine both the calorimeter constant and the change in enthalpy of a given reaction. The results were rather mixed, as some numbers more closely resembled the theoretical values than others did. Introduction The first experiment is devoted to finding the calorimeter constant for a polystyrene cup. Whenever a reaction takes place inside a calorimeter, some heat is lost to the calorimeter and its surroundings. In order to achieve maximum accuracy, we must…

Empirical Formula Lab Report

INTRODUCTION John Dalton’s atomic theory states that elements combine in simple numerical ratios to form compounds. A compound, no matter how it is formed, always contains the same elements in the same proportion by weight. The law of mass conservation states that mass can neither be created nor destroyed. In this experiment, the mass of the metal was not destroyed or created; the metal’s mass was simply changed into a compound form once the gas reacted to it. The net mass of the reactant side of the equation and the product side of the equation should be equal if the experiment is done correctly. The molecular formula represents the number of all elements in a compound. The empirical is the…

Rate of Isomerism of [Co(en)2Cl2]

In the course of this experiment the rate of isomerism for the coordination complex cis[Co(en)2Cl2]Cl was determined using UV/Vis spectrometry. Using a range of wavelengths the optimum spectrometer setting for analysis was identified. The corresponding maximum and minimum absorbance of the cis and trans isomers respectively at 540 nm meant that it was selected as the wavelength to determine the rate of conversion between the isomers. The first order rate constant was calculated to be 0.0092 m-1 which is somewhat similar to the literature value of 0.00845 m-1 (Brasted and Hiriyama 1958). The half-life (t 1/2) was found to be 75.34 minutes. Introduction: The compound [Co(en)2Cl2]+ is known as a coordination complex, that is, it consists of a Cobalt atom…

Diels alder reaction

Result: For the Diels-Alder reaction: Maleic acid is 0.002 mol 2,3-dimethyl-1,3-butadiene is 0.002 mol The theoretical yield is 0.36g Cycloaddition product is 0.358g (maybe it was not completely dry when I weighted.) The % yield of Diels-Alder reaction is 99.4% For the hydrolysis: The theoretical yield of hydrolysis is 0.396g The experimental product yield is 0.28g (some solid left on the filter paper and some for the melting point measurement.) The % yield of hydrolysis is 70.7% The cycloaddition of a conjugated diene and a dienophile, which is drove by forming new σ-bonds from π-electrons of the diene and dienophile, which are energetically more stable than the π-bonds. During the Diels-Alder reaction, the temperature should be kept between 60-70 ℃….

Effect of Temperature on Lipase

Theory The higher the substrate concentration the more quickly product is produced (rate of reaction increases) until enzyme saturation is reached at which time more substrate has no further effect. Enzymes such as Catalase are protein molecules which are found in living cells. They are used to speed up specific reactions in the cells. They are all very specific as each enzyme just performs one particular reaction. Catalase is an enzyme found in food such as potato and liver. It is used for removing Hydrogen Peroxide from the cells. Hydrogen Peroxide is the poisonous by-product of metabolism. Catalase speeds up the decomposition of Hydrogen Peroxide into water and oxygen as shown in the equations below. It is able to speed…