Basic Stoichiometry PhET Lab rvsd 2/2011 Let’s make some sandviches! _ Introduction: When we bake/cook something‚ we use a specific amount of each ingredient. Imagine if you made a batch of cookies and used way too many eggs‚ or not enough sugar. YUCK! In chemistry‚ reactions proceed with very specific recipes. The study of these recipes is stoichiometry. When the reactants are present in the correct amounts‚ the reaction will produce products. What happens if there are more or less of
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locating translucent spots/area in the filter paper. B. SOLUBILITY Specific Objective: To test for the solubility of the suspected lipid-containing samples. C. TEST FOR UNSATURATION (BROMINE WATER TEST) Specific Objective: To test for unsaturation of lipids through a change in colour or discoloration of the bromine water. To test for the presence of carbon-carbon double bonds. D. ACROLEIN TEST Specific Objective: To test for the presence of glycerol/glycerin or fats. E. AMMONIUM MOLIBDATE
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Sample Paper chemistry Class 11 1. 1.7 g of AgNO3 is dissolved in 100 g of water. 0.585g of NaCl dissolved in 100g of water is added to it and chemical reaction occurs. 1.435g of AgCl and 0.85 g of NaNO3 are formed. Justify that the data obey the law of conservation of mass 2. (a) When 4.2g of sodium bicarbonate is added to a solution of acetic acid weighing 10g‚ it is observed that 2.2g of CO2 is released into atmosphere. The residue is found to weigh 12g. Show that these observations
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Preparation and Characterization of Hydrocarbons Miranda‚ Marilyn1‚ Comaling‚ Leif Anthony B.2 1Professor‚ School of Chemical Engineering‚ Chemistry and Biotechnology‚ Mapua Institute of Technology; 2Student (s)‚ Subject/Section‚ School of Chemical Engineering‚ Chemistry and Biotechnology‚ Mapua Institute of Technology ABSTRACT Hydrocarbons are compounds that only contain carbon and oxygen atoms. Alkanes‚ alkenes‚ alkynes and aromatic rings are the four classifications of hydrocarbons
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elements that had not been discovered yet and it contained the atomic mass of the elements. DISADVANTAGES: * When Dmitri put the elements in order of atomic mass‚ he had trouble getting iodine because iodine was similar properties to chlorine and bromine. But iodine had a low atomic mass. So iodine could not be in his rows. This caused Dmitri to break his own rule; he made for the periodic table. DISADVANTAGES: * When Dmitri put the elements in order of atomic mass‚ he had trouble getting
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1. An organic compound X with a molecular formula C2H6O undergoes oxidation with in presence of alkaline KMnO4 to form a compound Y. X on heating in presence of Conc. H2SO4 at 443K gives Z. Which on reaction with H2Oin presence of H2SO4 gives back `X` `Z` reacts with Br2 (aq) and decolorizes it. Identify X‚ Y‚ & Z and write the reactions involved. 2. An organic compound ‘A’ is widely used as a preservative in pickles and has a molecular formula C2H2O2. This compound reacts with ethanol to
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Synthesis of 4‐methylcyclohexene via Dehydration of 4‐methylcyclohexanol Heston Allred TA: Christine Woolley Thursday 1:05-4 pm Laboratory Experiment #10 Abstract 4-methylcyclohexanol was synthesized to 4-methylcyclohexene using dehydration. 4-methylcyclohexanol was heated to reflux and the subsequent distillate (4-methylcyclohexe) was collected. It was then purified using sodium chloride to separate products and an anhydrous solid was then added and filtered
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Competitive Nucleophiles Introduction: The purpose of this experiment was to compare the relative nucleophilicities of chloride ions and bromide ions in two different reactions. One reaction involved n-butyl alcohol and the other involved t-pentyl alcohol. We performed the reactions and compared the percentages of alkyl chloride and alkyl bromide in the product. To perform this experiment‚ we used methods including heating reaction mixture under reflux‚ extraction using a separatory funnel
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Ozone Depletion: An Introduction Planet Earth has its own natural sunscreen that shields us from the sun’s damaging ultraviolet radiation. It’s called the ozone layer: a fragile band of gases beginning 15 kilometres above our planet‚ and reaching up to the 40-kilometre level. Human activities have caused a substantial thinning of this protective covering — not only over the North and South Poles‚ but right over our heads. Stopping ozone layer depletion is one of the major challenges facing the
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drops of the NaOH solution 6. Stir for 20 min 7. Add to an ice bath until crystallization occurs 8. Filter the crude product 9. Recrystallize with 2 mL of EtOH 10. Filter pure product and collect MP and mass 11. Perform a saturation test with a bromine and potassium permanganate solution 12. Obtain NMR from instructor and identify peaks Apparatus: Post Lab: Observations:
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