composed of sucrose (10%)‚ aspirin (40%)‚ and Tylenol (50%). Although this information is reported‚ the true composition of Panacetin is questionable. While sucrose and aspirin are present in Panacetin‚ Tylenol may be replaced by an unknown component (acetanilide or phenacetin). Separation of the components of a sample of Panacetin may prove valuable in identification of the unknown component‚ as well as the true percent composition of each component of Panacetin. This experiment involves two parts‚ covering
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MODEL QUESTION PAPER 2 PUC II Model Question Paper-2 PUC-II CHEMISTRY Time: 3 hr-15 min. Batch-02 Max Marks: 70 Instructions: i) ii) The question paper has four parts‚ A‚ B‚ C and D. All parts are compulsory Part-A Carries 10 marks Part-B Carries 10 marks Part-C Carries 15 marks Part-D Carries 35 marks iii) Write balanced equations and draw diagrams wherever required (Use log tables and the simple commercial calculator if necessary (use of scientific calculator is not allowed) Part-A I. Answer
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Objective: Separate and purify acetanilide from a mixture by recrystallization. Compare the melting points of crude and recrystallized acetanilide. Introduction : The most common method of purifying solid organic compounds is by recrystallization. In this technique‚ an impure solid compound is dissolved in a solvent and then allowed to slowly crystallize out as the solution cools. As the compound crystallizes from the solution‚ the molecules of the other compounds dissolved
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PICRIC ACID (DIRECT DYE): Take about 60 mL of water in a 400 mL beaker. Add 2-3 drops of concentrated sulphuric acid and about 0.5 g of Picric Acid to it. Stir the solution with a wooden stick and warm over a hot water bath. Immerse one piece of each wool‚ cotton‚ polyester‚ nylon and terecot into it. When the pieces are thoroughly wetted in dye solution remove these with the help of forceps. Wash these with the help of warm water till the washing is colourless. Dry the pieces and note the results
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Hong Kong Diploma of Secondary Education Examination Biology and Combined Science (Biology part) School-based Assessment Sample Tasks Teachers may use the sample tasks for non-profit making educational and research purposes with proper acknowledgement. ©香港考試及評核局 保留版權 2009 Hong Kong Examinations and Assessment Authority All Rights Reserved 2009 HKDSE Biology SBA Practical Task: Topic: I (e) Presence of protease in pineapple and / or kiwifruit Scenario: Last week‚ Mary prepared some jelly
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electrophilic addition‚ Eliminating bromine from arenes via Grignard‚ Carboxylation of arenes via Grignard 4 Properties of: Amines (pkAs and resonance structures for aromatic and aliphatic molecules)‚ amides (sp2 hybridized by amide bonds)‚ anilines (aromatic amines) Structure of: Sugars (linear (oxidized to acyl group) and ring‚ polymerzation through the anomeric carbon‚ mutarotation‚ Fisher projections)‚ Steroids‚ amino acids (match names to structures‚ Fisher projections) Reactions: Aromatic
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Discussion: The purpose of this experiment was to isolate the aromatic hydroxyl compound‚ eugenol from crushed cloves using steam distillation. After conducting the distillation‚ the expected two layers were not visible in the centrifuge tube. Subsequently‚ the extraction and evaporation did not produce the expected oil. This result is probably due to the collection of only water vapor during distillation. From another group’s data‚ 3.80% of the oil was recovered from the cloves in which the major
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CLASS 12 textbook http://www.TutorBreeze.com Contact for Online Tutoring in Physics‚ Math‚ Chemistry‚ English (v) Benzene to 4-bromonitrobenzene :- (vi) Benzyl alcohol to 2-phenylethanoic acid :- (vii) Ethanol to propanenitrile :- (viii) Aniline to chlorobenzene :- (ix) 2-Chlorobutane to 3‚ 4-dimethylhexane:- ©TutorBreeze.com Please do not copy the answer given here Write to us for help in understanding the solution NCERT/CBSE CHEMISTRY CLASS 12 textbook http://www.TutorBreeze
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Results: Melting Point: Compound | Experimental (°C) | Lit value (°C) | Ice-water | 2°C | 0°C | Naphthalene | 81-83°C | 80-82°C | Acetanilide | 113-116°C | 113-115°C‚ 128-129°C | Acetylsalicylic acid | 136-140°C | 135-140°C | Salicylic acid | 159-162°C | 158-160°C | Succinic acid | 186-188°C | 185-189°C | Compound Structure: Naphthalene | Acetanilide | Acetylsalicylic Acid | Salicylic acid | Succinic acid | Water | Eutectic Point Determination: Melting Point Compound | Experimental
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tribromide and use ethanol to rinse sides. Heat for five more minutes; cool down to room temperature‚ then ice bath. Collect product by vacuum filtration. Weight dry product and take melting point. Synthesis of Bromoactanile: add correct amounts of acetanilide‚ sodium bromide‚ ethanol and acetic acid in an Erlenmeyer. Add a stir bar and plug the top with cotton. Place the flask in ice bath to cool. Add 7ml bleach and continue to stir for a while. Remove flask from ice bath and warm to room temperature
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