your beaker and add 50 mL of distilled water. b. Set up the beaker stand and burner fuel and heat the beaker of solids and water to near boiling. Stir the mixture to make sure all soluble material dissolves. At this point‚ the benzoic acid and the sodium chloride should have dissolved and been extracted from the insoluble sand. c. Decant (pour) the liquid while it is hot into a small paper or Styrofoam® cup. d. Pour another 10 to 15 mL of distilled water into the beaker containing the sand‚ bring
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PART IX - SPICE AND SALT 106. Prohibition to sell sub-standard spice (1) No person shall import‚ process‚ store‚ expose for sale or sell any spice which does not comply with the standard specified in paragraph (2). (2) (a) Spice shall be the sound leaves‚ flowers‚ buds‚ fruits‚ seeds‚ barks or rhizomes of plants that are suitable for use as condiments for imparting any flavour or aroma to food; (b) Aniseed shall be the dried‚ ripe fruit of the plant
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11/17/2011 The Preparation of Calcium Carbonate Purpose: To create chalk (calcium carbonate) and to find the percentage yield in order to see the amounts of anhydrous sodium carbonate and calcium chloride were used up. Also to see if there’s any alterations like mass differentials. Objectives: 1. To introduce the concept of “limiting factor” in a chemical reaction 2. To practice a. Writing a balanced equation b. Determining the number of moles of each reactant and product
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The hypothesis for both experiment which involved iron( III ) Nitrate and sodium hydroxide for the first experiment and antacid tablet in water was that the mass would increase by a small amount since during the reaction the product will gain additional energy and mass. Apparatus and Materials: Eye protection test tube two hundred and fifty milliliters beaker Balance to measure the masses dilute solutions of sodium hydroxide and iron(III) nitrate
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over-the-counter ingredients. It is also used as a lubricant and topical anesthetic on intratracheal catheters and pharyngeal and nasal airways to obtund the pharynegeal and tracheal reflexesl.2 Sodium channel binds to benzocaine and stabilizes the neuronal membrane which decrease its permeability to sodium ions.1 In this experiment‚ the synthesis of benzocaine is carried out by the acid-catalyzed esterification of 4-aminobenzoic acid with ethanol.2 Theoretical Yield: 1.25g/MW 137 = .009 moles C2H6O
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different concentrations of sodium thiosulphate (Na S2 O3) affects the speed of its reaction with Hydrochloric acid (HCL). Introduction When Sodium Thiosulphate and Hydrochloric acid react they produce a cloudy precipitate. Both of the chemicals are clear solutions and they react together to form a yellow precipitate of sulphur‚ the equation for this reaction is: Na2 S2 O3 + HCL‚ H2 O + NaCL + SO2 + S Sodium Thiosulphate + Hydrochloric acid‚ Water + Sodium chloride + Sulphur dioxide
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again can interfere with the functions of that metal. Aim: the aim of this experiment is to evaluate the effect that sodium chloride has on the rate of corrosion of iron. 1. Experiment 1 2. Hypothesis: An increase in the level of sodium chloride in water will increase the rate of corrosion of an iron nail. 3. The independent variable is the amount of sodium chloride in the water 4. The dependent variable is the rate of corrosion; this will be measured by calculating the percentage
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"CHEMISTRY REVIEW" PROJECT PAGES This Project Page first appeared in the November 1996 issue of Chemistry Review‚ Volume 6‚ Number 2‚ Pages 14 and 15. Chemistry Review is published four times during the academic year by Philip Allan Updates and is a journal for post-16 students. It contains a variety of interesting and colourful articles aimed at 16-19 year-olds taking mainly AS and A2 courses in chemistry. NOTE: Project Page is designed to help you think about your investigation. It is not
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and boiling points‚ and do not conduct electricity. Since electrons are shared in covalent bonds‚ they have slightly different properties than ionic-bonded compounds. Based on these properties‚ the best compound for your ceramic fixative would be sodium chloride (NaCl)‚ because it has an ionic bond‚ has a high melting and boiling point‚ is electrically conductive‚ dries white‚ and can dissolve in water but not in alcohol. When we conducted this experiment‚ we used distilled water to test if the
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electrodes. To understand electrolysis‚ you need to know what an ionic substance is. Ionic substances form when a metal reacts with a non-metal. They contain charged particles called ions. For example‚ sodium chloride forms when sodium reacts with chlorine. It contains positively charged sodium ions and negatively charged chloride ions. Ionic substances can be broken down by electricity. Electrolysis is the process by which ionic substances are decomposed (broken down) into simpler substances when
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