Practice Final Exam Version 2 Name___________________________________ Chemistry 201 (Eikey) Part 1: MULTIPLE CHOICE (48 points). Choose the one alternative that best completes the statement or answers the question. Record your answer on the scantron. Each question is worth 3 points. 1) A student weighed 30.00 µg of sulfur in the lab. This is the same mass as A) 3.000 × 10 4 ng. B) 3.000 × 10 -5 mg. C) 3.000 × 10 -8 g. D) 3.000 × 10 -5 kg. 2) 1) 2) A student performs an experiment to determine
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NORTHERN CARIBBEAN UNIVERSITY DEPARTMENT OF BIOLOGY‚ CHEMISTRY and ENVIRONMENTAL SCIENCE LABORATORY MANUAL Instructor: Dr. M. Wilson CHEM401: BIOCHEMISTRY for NURSES Prepared by: Oreane Collins CHEMISTRY LABORATORY REGULATIONS AND SAFETY PRECAUTIONS Reference: http://www.sciencebyjones.com/safety_rules.htm Thanks to the Flinn Scientific Safety Rules for much of the below. General Guidelines 1. Conduct yourself in a responsible manner at all times
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came to the decision that no reaction occurred. C - Which anions generally form precipitates? What are exceptions? Results indicate that all but one of the sodium carbonate/bicarbonate mixtures produced a precipitate‚ the exception was when NaHCO3 was combined with Co(NO3)2 or cobalt nitrate. Furthermore‚ most copper and iron nitrates‚ even with differing sodium compounds produced a precipitate. Exceptions were Cu(NO3)2 with sodium sulfate and sodium chloride. It was also noticed that nickel
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Acid Base And Salt Acid Acids:- The word ‘Acid’ came from Latin word ‘Acidus or Acere’ which means sour. Sour taste is the most common characteristic of acid. Acid turns blue litmus paper red. There are many substances which contain acid and hence taste sour‚ such as curd‚ tamarind‚ lemon‚ etc. Types of Acids:- Acids are divided into two types on the basis of their occurrence – Natural acids and Mineral acids. Natural Acid:- Acids which are obtained from natural sources are called natural
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and we used a boiling stone to do this‚ which was not mentioned in the lab book. Reaction Scheme A: B: Data and Results Expt Benzoic acid initial (mg) CH2Cl2 (mL) H2O (mL) 10% NaHCO3 solution (mL) Benzoic acid in CH2Cl2 (mg) Benzoic acid remaining in aqueous (mg) Benzoic acid KpCH2Cl2/H2O or KpCH2Cl2/aq. NaHCO3* 4A 79 1.0 1.0 NA 54 37 1.5 4B 91 1.0 NA 1.0 7.0 84 .083 *Benzoic acid has been modified in experiment B‚ making the Kp value not entirely accurate. However‚ it is still useful to demonstrate
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Preparing Isopentyl Acetate by the Fischer Esterification Preparing Isopentyl Acetate by the Fischer Esterification Leah Monroe May 8‚ 2003 Organic Chemistry Lab II Experiment performed on April 29 and May 1‚ 2003 Abstract: The purpose of this experiment was to synthesize isopentyl acetate via an esterification reaction between acetic acid and isopentyl alcohol‚ using concentrated sulfuric acid as a catalyst. The product was washed with sodium hydrogen carbonate‚ as well as with water
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1 INTRODUCTION In recent years‚ there has been rapid growth in the number of Fast Dissolving / Disintegrating Tablet (FDT) product on the market. Fast Dissolving Tablets are solid tablets and designed to dissolve/disintegrate in the patient’s mouth within a few second or minutes‚ without the need to drink or chew. However‚ the fear of taking solid tablets and the risk of choking for certain patient populations still exist despite their short disintegration/dissolution times. However‚ some
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and sneezing. (j) Are there any environmental concerns with this chemical? There are not any environmental concerns with this chemical. (k) Describe how you would decompose sodium bicarbonate. In your description include a temperature at which NaHCO3 would decompose. Sodium bicarbonate will start decomposing when heated at a temperature of 80°C. This process and reaction is called thermal decomposition. (l) Describe the expected behaviour during/after reaction. The thermal decomposition of
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Charles Darwin; the creator and innovator of the theory of evolution deemed the application of human skills of creating of fire the second powerful accomplishment of humankind (Falk‚2012). During the Ice Age‚ Hominidae first learned of natural fires caused by lightnings and used it to their advantage. Our ancestors capability to start a fire help them survived in the extreme weather during the Ice Age (Ancient History‚2010). The Earth’s temperature during the Ice Age was about -11.1 degrees Celsius
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various luminescent environments. An elementary method utilizes H2O and NaHCO3 (Sodium Bicarbonate) for submersion of deoxygenized photoautotroph specimens to measure the release rate of oxygen compounds. Through the submersion method we recorded the rate of oxygen diffusion into the environment by observing the time it takes photoautotrophic specimens to reach buoyancy. The results produced from 40 mL of H2O‚ 1%‚ 0.6% and 0.3% NaHCO3 were within 25 minutes of initial submersion. The plurality of submerged
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