CHEM161 Experiment 7: Calorimetry Introduction Calorimetry is the science of measuring heat flow‚ and heat is defined as thermal energy flowing from an object at a higher temperature to one at a lower temperature. For example‚ if a chunk of metal at room temperature is placed in a beaker of boiling water‚ the metal will absorb heat from the water until it is at the same temperature as the boiling water. Scientists also often study the heat associated with different physical and chemical changes
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Borohydride Reduction of a Ketone Results 1. Draw a three-dimensional structure of the stereoisomer formed in the reaction. Name the compound. meso-Hydrobenzoin 2. Include other results as suggested by your data. * The attached IR and NMR spectroscopy data. * The melting point that ranges from 135.6-137.90C. Spectroscopic Analyses Data tables IR Spectroscopy Hydrobenzoin Peaks (cm-1) | Stretches | Intensity | 3332 (cm-1) | O—H stretch | Strong and broad | 3027
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Double check the formula using the previous problem. -Initially‚ there is 275mL 0.125M solution of a substance. What is the concentration after a dilution when the final volume is 2.50L? Box 3 How would you prepare 60.0 mL of 0.2 M HNO3 from a stock solution of 4.00 M HNO3? What is the pH of the solution? Box 4 If 32 mL stock solution of 6.5 M H2SO4 is diluted to a volume of 500 mL. a. What would be the resulting concentration? STAMP IT!!! Box 5 Your teacher is trying to prepare a lab for
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polyatomic ion that has a positive charge is the __ ion. a) phosphate b) ammonium c) sulfate d) nitrate Chemistry 11 Exam Review – Answers - Page 1 A B D 6. In the formula H2SO4‚ the number 4 would be called a(n) __. a) subscript b) oxidation number c) coefficient d) charge 7. Which subatomic particle contributes the least to the mass of an
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solutions that a precipitate formed‚ 6 M HNO3 was added to see whether or not the precipitate stayed. Then 10 drops of chloride solution was placed into a centrifuge tube. Then 10 drops of 6 M HNO3 was added. Then 5 drops of 0.1 M AgNO3 was added and the solution was centrifuged for 2 minutes. Then the supernatant was discarded. Then 4 drops of 6 M NH4OH was added to the precipitate. To solutions where the precipitate dissolved the sample was acidified with 6 M HNO3. If the precipitate reforms then it
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Cl-‚ SO42-‚ PO43-‚ and CO32-. Expected results of the qualitative test and the reactions are included in your procedure. PROCEDURE: Obtain from the stock room a solid unknown salt to be analyzed for the presence of both cation and anion. HC1‚ HNO3 are strong acids and NaOH is a strong base so be careful when using them. Use the plastic pipettes on the center counter to dispense your unknown solution. Approx. 20 drops is equal to 1 mL‚ All waste go in the waste jar labeled for your class.
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further standardise medical practice‚ all apothecaries were to obtain and use a copy of Pharmacopoeia Londinensis. In 1603‚ the Black Death hit again‚ and herbs were burnt frequently to keep disease at bay. New herbs were used‚ such as frankincense‚ benzoin and styrax‚ but they were as ineffective as thyme and lavender. It was identified however‚ that those who worked with perfumes and scents appeared to have a higher survival rate. This could be due to their surrounding themselves with plants‚ which
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Analysis of Aluminium in Potable waters by Atomic Absorption Spectrophotometric Techniques Objectives 1. To introduce the basic principles of Atomic Absorption analysis. 2. To Optimise the furnace temperature programme conditions for the analysis of Aluminium. 3. To determine the optimum conditions for the analysis of Aluminium by flame atomisation and to carry out the analysis using two seperate readouts on flame AAS instrument. Part A: Non-Flame Atomic Absorption – Electrothermal
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29 Heat and Volume Effects Experiment 9 ………………………………………………………………………….31 Flame Test Experiment 10 ………………………………………………………………………..32 Electromotive Series Experiment 11 ………………………………………………………………………...33 Oxidation – Reduction Reactions/ Some Aspects of Corrosion Experiment 12………………………………………………………………………….35 Colligative Properties GENERAL INSTRUCTIONS TO THE STUDENTS Apparatus ▪ Check each piece of apparatus‚ which you
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Fertilizer (or fertiliser) is any organic or inorganic material of natural or synthetic origin (other than liming materials) that is applied to soils or to plant tissues (usually leaves) to supply one or more plant nutrients essential to the growth of plants. Conservative estimates report 30 to 50% of crop yields are attributed to natural or synthetic commercial fertilizer.[1] Global market value is likely to rise to more than US$185 billion until 2019.[2] The European fertilizer market will grow
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