1.Methyl mercaptan is used to give natural gas its distinctive odor. 2.Yes they can regenerate since there are stem cells (i.e. basal cells) present. These are the only neurons that commonly regenerate. 3.Dan will not be able to taste normally if the olfactory epithelia are damaged‚ just as a cold reduces taste sensation. Input from the nasal receptors enhances flavor analysis. 4.Although debris did not enter his eyes during the explosion‚ there was intense light and heat from the explosion that
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will be the diluted window cleaner solution. Methyl orange will be used as the pH indicator of this reaction. Apparatus Burette‚ 50 cm3 Small beaker / Weighing bottle Burette stand Wash bottle Conical flask‚ 100 cm3 Dropper Volumetric flask‚ 250 cm3 with stopper Funnel Volumetric pipette‚ 25 cm3 Standardized sulfuric acid‚ H2SO4(aq)‚ ~ 0.01 M Pipette filler Window cleaner solution White tile Methyl orange Procedures Part A Preparation
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Carboxylic Acids and Their Derivatives Ma. Marielle M. Medura Prof. Emma Boncales Chem 23A (TTH 01:00-4:00 p.m) Carboxylic Acids and Their Derivatives I. Introduction Carboxylic acids is an organic compound that contains a carboxylic group(-COOH). Its general formula is R-C=OOH with R referring to the rest of the molecule such as H and C. They are directly attached to a carbonyl group and the interaction between them affects the reactions of each. The polarity of the O-H bond
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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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64. Interpret the following results: A. The color of the medium remains purple or light blue-gray; there is also no change in the texture of the medium. * No change B. Change in the color of litmus from purple to pink or pink-red throughout the tube. Upon further incubation a white ring of litmus forms at the bottom of the tube at the pink-red color is now present only at the top of the tube. Still further incubation leads to the formation of a rennet curd at the bottom of the
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- Environmental risk may affect the pregnancy if below guideline limit is exceeded : @ bone cement : the data in earlier literature showed in toxic doses to pregnant animal it can Can recurrent abortion‚ skeletal anomalies but in human was unclear . acute toxic dose in animals can casue lung damage and edema estimated at 3‚750 ppm = 15‚375 mg/m3 . In short term exposure of toxic
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Separation and Identification of Organics from an Aqueous/Organic Environment through Physical Manipulation Date Lab Performed: Nov. 11/2013 Date Lab Submitted: Nov. 18/2013 Introduction We conducted this experiment to investigate the technique of liquid / liquid extraction‚ the miscibility of organics and water and the effect of a mixture of compounds in methylene chloride versus pure compounds retention time as introduced to a Gas
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Analysis 1. Examine the structures of the FD&C Red No. 40‚ Blue No. 1 and Yellow No. 5 dyes. What are the similarities and differences in the structures of the three dyes? a. Red No. 40‚ Blue No. 1‚ Yellow No. 5 contain carbon rings and NaSO3. Additionally‚ Red No. 40 and Yellow No. 5 are very similar‚ as they both contain one nitrogen double bond‚ a hydroxyl group‚ and no ions. Blue No.1 contains nitrogen and chlorine ions and N(C2H5)CH2. 2. In the Introductory Activity‚ the developing solvents
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CH3COOH 0.10 M HNO2 0.10 M HNO2 and 0.10 M NaNO2 0.10 M CH3COONa www.kau.edu.sa/aasiri2 1 August 28‚ 2009 [PROBLEM SET FROM R. CHANG TEST BANK] 5. Calculate the pH of a buffer solution that contains 0.25 M benzoic acid (C6H5CO2H) and 0.15 M sodium benzoate (C6H5COONa). [Ka = 6.5 × 10-5 for benzoic acid] A. B. C. D. E. 6. A solution is prepared by mixing 500. mL of 0.10 M NaOCl and 500. mL of 0.20 M HOCl. What is the pH of this solution? [Ka(HOCl) = 3.2 × 10-8] A. B. C. D. E. 7. 0.97 3.10 4.40 3
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http://en.wikipedia.org/wiki/Preservative http://en.wikipedia.org/w/index.php?title=Preservative&action=edit A preservative is a naturally occurring or synthetically produced substance that is added to products such as foods‚ pharmaceuticals‚ paints‚ biological samples‚ wood‚ etc. to prevent decomposition by microbial growth or by undesirable chemical changes. Preservatives can be divided into two types‚ depending on their origin. Class I preservatives refers to those preservatives which
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