the repeat unit in polyvinyl alcohol (PVA) 3. What do you understand by the term ‘cross-link’? Draw the structure of slime and circle the cross-links. Cross-links refer to the bonds formed when polymer chains are joined together. Figure 1: Borax forming slime (Source: www.gcsescience.com) 4. Name a biopolymer and identify its monomer unit(s). Cellulose is a biopolymer formed from joining monomers of glucose. Introduction Polymers basically are macromolecular substances that are
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Bunsen burner‚ the color of the flame depends on how much oxygen is used. Colored Flame So‚ how to make a flame change its color? Simple. The fact is‚ when burned‚ different chemicals burns in different colors. Example‚ boric acid or borax contains the element boron. When burned‚ any chemical containing the element boron would burn green flames. All we have to do is add a chemical to the fuel and the chemical’s atomic emission spectra will affect frequencies to the current light’s
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least for 4-5 days and find relief from heel spurs. The water include chlorine is also useful in taking away the pain and reduce inflammation caused in the body due to Spur. Borax solution is one of the easy and effective home remedies for treating “Heel spurs” (a form of born spur). Soak your feet regularly in Borax solution and you feel difference in pain and swelling within few days. The green fresh cabbage leaves are also suggested as a valuable remedy for the treatment of heel spurs
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1 Experiment 15: Exploring the World of Polymers Objective: In this experiment‚ you will explore a class of chemical compounds known as polymers. You will synthesize and modify polymers‚ test their properties and use a fabrication technique to produce an object from a polymer. Introduction (See Tro‚ pp 985-987.) The importance of both natural and synthetic polymers in our lives cannot be overestimated. The desirable properties of these macromolecules‚ such as tensile strength and flexibility
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Standardization of NaOH and Determination of Unknown Acid KEYWORDS: quantitative analysis‚ titration‚ buret‚ endpoint‚ standardization‚ half-equivalence point‚ calorimetric titration‚ potentiometric titration ABSTRACT: The concentration of sodium hydroxide was determined by colorimetric titration‚ and the identity of an unknown acid was determined by potentiometric titration. In the first titration‚ a strong acid standard‚ potassium hydrogen phthalate (KHP)‚ was used‚ to determine the concentration
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Abstract Water “hardness” was analyzed in this experiment‚ through the determination of CaCO3 concentration. This was achieved by the titration of an unknown solution using a standardized 0.1M EDTA‚ and addition of Eriochrome Black T to the unknown‚ to indicate the endpoint of the titration. The average concentration of CaCO3 obtained was 1034 ppm‚ with a standard deviation of 2.4495. The results indicate that the unknown solution can be considered as hard water. Introduction The
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Corrugating Starch Adhesives Manual Corn Products International‚ Inc. Quality Policy on Products‚ Services and Customer Relations It is the policy of Corn Products International‚ Inc.‚ to provide products that not only meet applicable government quality and safety standards‚ but also seek to meet evolving customer expectations for quality‚ value and service; and to assure the accuracy and propriety of all labeling‚ advertising‚ and other representations we make concerning our products and services
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EXPERIMENT NO. 12 DIGESTION IN THE STOMACH ABSTRACT____________________________________________________________________________ Digestion refers to the mechanical and chemical breakdown of food into smaller components that can undergo absorption. The objective of this experiment is to investigate mainly the process of digestion in the stomach. The conditions at which the enzymes responsible for the digestion process were determined. Also‚ the total and free acidity of gastric juice of the sample
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shells: | 2‚3 | Electron configuration: | 1s2 2s2 2p1 | Density @ 20oC: | 2.34 g/cm3 | Show more‚ including: Heats‚ Energies‚ Oxidation‚ Reactions‚ Compounds‚ Radii‚ Conductivities Discovery of Boron Dr. Doug Stewart Boron compounds such as borax (sodium tetra borate‚ Na2B4O7·10H2O) have been known and used by ancient cultures for thousands of years. Borax’s name comes from the Arabic buraq‚ meaning “white.” Boron was first partially isolated in 1808 by French chemists Joseph L. Gay-Lussac
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Designation: C 114 – 07 Standard Test Methods for Chemical Analysis of Hydraulic Cement1 This standard is issued under the fixed designation C 114; the number immediately following the designation indicates the year of original adoption or‚ in the case of revision‚ the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. 1. Scope* 1.1 These test methods cover
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