al., 1998). It catalyzes the conversion of a large number of catechols producing a dark pigment called melanin, which is the product of the chemical reaction. Studies on enzyme activity are important in order to establish some controls. In particular, with regards to the cathecol oxidase, its inhibition can help to reduce the pigment production and the darkness of some vegetables and fruits.
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Chemistry is one of the most fundamental sciences of them all. The precious bonds of atoms hold together all life and all that support it. A good example of how chemical bonds and the reactions that forge said bonds is the reaction of Alka-Seltzer® tablets placed in water. People use these tablets to relieve pain. Which leads to the question; “Does the size of a particle have any affect on the time it takes for a reaction to complete?”. Alka-Seltzer® contain three key ingredients sodium bicarbonate
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1. What are three primary emissions from the nucleus of a radioactive atom? Alpha radiation, Beta radiation, and Gamma Ray. 2. Why are alpha particles of concern as a contaminant in drinking water? Alpha particles (radiations) are naturally occurring radionuclide present in the drinking water. They are positively charged and released from the core of some radioactive elements. Heavy elements such as radium and uranium are found naturally in the earth’s crust emit alpha particles which are released
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Carl Plattner was almost the first person to discover cesium in 1846. He was studying the mineral pollucite but ran out of materials before reaching the element. Cesium was first discovered by German chemists Robert Wilhelm Bunsen and Gustav Robert Kirchhoff in 1860. While they were studying the components of Durkheim water using flame spectroscopy, the chemists noticed an emission that they had never seen before. This element, soon to be named cesium, was the first element to be found using spectroscopy
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Lead Toxicity Animals can be exposed to material that contains lead by eating, drinking and inhaling. An item that most commonly is chewed and digested that contains lead is paint chips from older houses or barns. Drinking water from the faucet that has been contaminated with lead and served to the domestic pet. Household pets that use everyday batteries as play toys with licking and chewing. Insecticides can be inhaled by an animal while spraying is being performed. Even if a domestic pet or
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Most igneous rocks contain the third element on the periodic table, lithium. Discovered in 1817, and in multiple alloys, it is the first metal on the periodic table. It is the least reactive metal when it comes to water, but also the lightest alkali metal. When in its pure form it is soft enough even a butter knife could cut it. Lithium was first discovered in the ore petalite by the chemist Johan Arfvedson in the 1817’s. The mineral petalite has a crimson flame which led Johan to believe that this
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Unknown compound number one is a ionic compound. For the solubility test, compound number one quickly dissolved in water. Both molecular and ionic compounds are dissolvable but ionic compounds are usually more soluble. For the conductivity test the electrical conductivity was at a rating of 5, meaning that it is a good conductor of electricity. Good conductors of electricity are usually ionic compounds. The next test was the melting point of the compound. This compound did not melt and it started
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This lab was conducted in order to determine the empirical formula of copper oxide. Throughout this experiment, copper oxide was combined with water and hydrochloric acid, and stirred thoroughly. After the solid dissolved, zinc was added to the solution. After the completion of the zinc’s reaction, the solution was filtered and the next day the remaining solid was measured. Through this process, the empirical formula was able to be derived from the resulting data. The empirical formula was determined
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Each group was successful in gathering results for the different factors and it proves just how much the peroxidase became affected within the testing environments. In terms of the enzyme concentration, both of the different conditions (double and half) resulted with the absorption readings at 470 nm to steadily increase over the course of 5 minutes. This result was caused because there were more enzymes present to react with the two substrates, hydrogen peroxide and guaiacol, therefore affecting
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weak and strong chemicals, liquid metals and nuclear radiation. Determines whether corrosion can occur under a gives set of conditions. Shows how improvement in component design can reduce corrosion. Details the high and low temperature effect of oxidizing agents such as oxygen, water, the halogens and carbon dioxide. http://www.lpdlabservices.co.uk/problem_solving/typical_technical_expertise/corrision.php • Corrosion: Corrosion is the gradual destruction of materials by chemical reaction with
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