Marigona Krasniqi 15 October 2015 Contemporary Science: Chemistry Lab assignment Gas Laws Lab Part 1 – The effect of temperature on gas volume Problem: Which gas law describes these results (Paper assignment)? Observation/ Research: Charles’s Law According to Jacques Charles, “if the temperature of the gas increases, the volume of the gas also will be increased or other way around.” (Charles). This statement describes Charles Law. According to this law, “the Volume and Temperature are directly proportional
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Melting Point of Period 3 Elements, Oxides and Chlorides In this chapter, the emphasis is on Period 3 elements. Among the Period 3 elements, Si has the highest melting point. Among the Period 3 oxides, MgO has the highest melting point. Among the Period 3 chlorides, NaCl has the highest melting point. Common mistake: Many students know that Si has the highest melting point of the Period 3 elements. Since Si and SiO2 both have giant molecular structures with a strong and extensive network of covalent
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Aluminium 2618 was used as the base material in this study. Two types of salt, namely K2ZrF6 & KBF4 were used to synthesize the ZrB2 reinforcement in addition to Si3N4 (Silicon Nitride), AlN (Aluminium Nitride).The chemical composition of the base material is shown in Table.1. Table.1. Chemical composition of Al2618 alloy in wt% Element Cu Mg Fe Ni Si Ti Al Wt% 2.30 1.60 1.1 1.0 0.18 0.07 Bal Aluminum 2618 is melted in a graphite crucible and a stirrer is used to stir the melt. When the temperature of
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INTRODUCTION General introduction of superconductors Superconductivity is a phenomenon of certain materials exhibiting zero electrical resistance and below a critical temperature. It was discovered in 1911 by H. Kamerlingh Onnes in Leiden, three years after he first liquefied Helium. He measured the resistivity of mercury and found the critical temperature TC =4.2K [1,2]. The resistivity behavior as a function of temperature is shown in Fig. Fig. 1.1: Below the transition temperature, the resistivity
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Knockout Acne with OTCs You can fight back acne with over-the-counter products. Benzoyl peroxide is one of them. The benzoyl part pulls the peroxide into the pore and releases oxygen that destroys the bacteria that cause acne. It is like two-in-one drug. The benzoyl also suppresses the fatty acid cells that irritates the pores. Benzoyl peroxide comes in different forms such as liquids, lotions, gels and creams, but it is best to use water-based gel as it is the least irritating to the skin. Top-rated
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Conservation of Mass - In any chemical reaction, the total mass of the reactants is always equal to the mass of the products. Materials: • balance • 1 balloon • weighing paper • 50 mL flask • 50ml graduated cylinder • ~5 g baking soda • ~15 mL vinegar Introduction: The word equation for the following reaction is as follows: vinegar + baking soda → sodium acetate + water + carbon dioxide The chemical equation for the reaction is:
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Luis Martinez Mr.Kronk Honors Chemistry Bell 1 29 August 2015 Lakota West Lab Purpose The purpose of this lab is to identify physical and chemical changes and differentiate between the two. Procedure Procedure is found on the Physical and Chemical Changes lab at Lakota West lab. Use plastic pipets. On #4 change the experiment to mixing 5 mL of NaCl with 2-3 drops of silver nitrate. On #9 replace regular test tube with a disposable one. Omit the last experiment. Materials Disposable
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The Diels-Alder Reaction of Anthracene with Maleic Anhydride The Diels-Alder reaction is a member of a class of reactions called cycloadditions. The reaction involves three π bonds, two from the diene and one from the dienophile in a concerted reaction to form a six-membered ring. Since the reaction involves four π electrons in the diene and two π electrons from the dienophile, it is sometimes referred to as a 4 + 2 cycloaddition. Normal Diels-Alder reactions are favored by electron donating
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Abstract This act of Toxic Substances Control offers the Environmental Protection Agency (EPA) the ability to control industrial chemicals that are not protected by other statutes. It is know that till this day there are added more than 83,000 such chemicals. Nevertheless, the law is commonly observed as weak and out-of-date, and a number of different stakeholders have called for its reform, quoting the EPA’s failure to control the use of asbestos, throughout extra substances. They analyze the errors
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bar screens for the removal of objects that could damage or interfere with the process and equipment. Chemical addition Ferrous chloride (FeCl2, an industrial by-product), and lime are added to the sewage before it enters the grit tanks, to improve the subsequent chemical treatment process. Grit removal The effectiveness of the chemicals added in the pre-treatment stage is improved by extra mixing in the grit tanks, and by introducing compressed air
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