EXPERIMENT 2: Recrystallization and Melting Point Recrystallization (or Crystallization) is a technique used to purify solids. This procedure relies on the fact that solubility increases as temperature increases (you can dissolve more sugar in hot water than in cold water). As a hot‚ saturated solution cools‚ it becomes supersaturated and the solute precipitates (crystallizes) out. In a recrystallization procedure‚ an impure (crude) solid is dissolved in a hot solvent. As this solution is cooled
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ICSE Class X Chapter 5 Hydrogen Chloride and Hydrochloric Acid Hydrogen chloride (HCl) : Formula : HCl Nature : Covalent. Molecular Mass : 36·5u [i.e. HCl = 1 + 35·5 = 36·5] Occurrence : (i) Present in gastric juices. (ii) Present in volcanic gases. Laboratory preparation of HCl gas : Hydrogen chloride gas is prepared in laboratory by heating conc. H2SO4 with NaCl. NaCl + H2SO4 Heat → NaCl + NaHSO4 Heat → NaHSO4 + HCl Sodium hydrogen sulphate Na2SO4 + HCl
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CHAPTER 1 Introduction Background of the Study Like many other hygiene convenience‚ shoe polish or can also be called boot polish is usually a wax ‚ cream or paste used by people to shine‚ water proof and restore the appearance of leather shoes. This extends the footwear’s life. This is made up of many kinds of chemicals and because of this; it can cause irritations‚ allergies to us. In our generation‚ shoe polish is used every day and companies produce a lot of it to meet the demands of
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one of two very similar pentose rings. Ribonucleic acids contain the sugar ribose. Deoxyribonucleic acids contain the sugar deoxyribose. The only difference between these two sugars is that deoxyribose contains one oxygen atom less than ribose. Pentose sugars are essential because they are involved in linking different nucleotides together by condensation reactions. The Nitrogen-Containing Bases There are two types of bases found in nucleic acids. The purine bases have two nitrogen containing rings
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Acid in the human stomach When people refer to acid they usually see it as a corrosive liquid that can dissolve metals or change the color of a substance. So they think of acid as a dangerous matter for the body and believe it can easily dissolve your skin. What I have previously listed are indeed properties of certain acids‚ such as Hydrofluoric Acid which can cause irreversible tissue damage if it comes in contact with skin‚ but not all acids are this strong. As a matter of fact what a lot of
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analyze data and draw a conclusion. In this experiment I will find out that in a type of water the Alka-Seltzer will dissolve faster and slower. Alka-Seltzer is one of the world’s best known antacids. Its main function is to absorb excess stomach acid. II. MATERIALS: * Tap Water - Warm Water * Cold Water - Salt Water * Acidic Water -5 cups (250 mL of water in each cup) * A whole Alka-Seltzer tablet III. HYPOTHESIS: My hypothesis is that the Alka-Seltzer tablet
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Describe the roles and the responsibilities of the various levels of government The state government maintains a diverse range of roles and responsibilities for appropriate operation of the states of Australia. The state government is responsible for the conduct of state affairs. This level of government is responsible for everything the federal government is not responsible for‚ though at times both are responsible for the responsibilities. The state level of government differs from the federal
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Caps and Closures market to grow at a CAGR of 5.2 percent over the period 2012-2016. One of the key factors contributing to this market growth is the increasing demand for packaged foods and beverages. The Global Caps and Closures market has also been witnessing an increasing preference to use plastic material in packaging. However‚ rising raw materials prices could pose a challenge to the growth of this market. To Get More Details : http://www.bigmarketresearch.com/global-caps-and-closures-market
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Unit 052 Engage in Personal Development in Health‚ Social Care or Children’s and Young People’s Settings Outcome 1 Understand what is required for competence in own work role. A.C 1 – Describe the duties and responsibilities of own work role. Listed below are the duties and responsibilities of my work role RESPONSIBILITIES - To create a safe‚ happy‚ positive‚ stimulating‚ Multicultural learning environment in which children can be cared for. MAIN DUTIES
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Describe The Roles of Government In The Present Business Environment In the present business environment governments have the power to change and make laws‚ having a major role and influence on the business environment. There are three levels of government; federal‚ state and local. The federal government has power over such areas as; company law‚ income tax‚ trade etc. State government has power over pollution‚ price controls‚ state courts etc. and local government has power over rates‚ building
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