RESULTS DISCUSSION SUMMARY Procedure Schematic Analysis Sample Dichromate test Green soln Yes 1°/2° alcohols‚ aldehyde Tollen’s test Silver mirror Yes Aldehyde No 1°/2° alcohols Lucas test No 3°/ketone DNPH test Orange ppt Yes Ketone No 3° alcohol 8 OBJECTIVES CONCEPTS REAGENTS PROCEDURE RESULTS DISCUSSION IR ANALYSIS Turbid fast Yes 2° alcohol alanx3@yahoo.com ARMSALCEDO Discussion Dichromate Test (Jones oxidation) REAGENTS: 10% K2Cr2O7‚ 6M H2SO4 POSITIVE FOR: 1 and 2 alcohols‚ aldehydes
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"electron-half-equations" or "half-equations" or "ionic-half-equations" or "half-reactions" - lots of variations all meaning exactly the same thing! Any redox reaction is made up of two half-reactions: in one of them electrons are being lost (an oxidation process) and in the other one those electrons are being gained (a reduction process). Working out electron-half-equations and using them to build ionic equations In the example above‚ we’ve got at the electron-half-equations by starting
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M10/4/CHEMI/HP2/ENG/TZ1/XX/M+ MARKSCHEME May 2010 CHEMISTRY Higher Level Paper 2 18 pages –2– M10/4/CHEMI/HP2/ENG/TZ1/XX/M+ This markscheme is confidential and for the exclusive use of examiners in this examination session. It is the property of the International Baccalaureate and must not be reproduced or distributed to any other person without the authorization of IB Cardiff. –5– Subject Details: M10/4/CHEMI/HP2/ENG/TZ1/XX/M+ Chemistry HL Paper 2 Markscheme
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Manila‚ Philippines Abstract Five oxygen-bearing organic compounds were given namely Methanol‚ 2-propanol‚ tert - butanol‚ formalin‚ and acetone. Different tests were done to each sample to differentiate their characteristics. These test were Dichromate test‚ Tollens Test‚ DNPH test‚ Iodoform Test‚ and Lucas Test. This was conducted to classify the samples from being a primary alcohol‚ a secondary alcohol‚ a tertiary alcohol‚ aldehyde‚ or a ketone. Introduction In analyzing the oxygen bearing
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100 M sodium hydroxide solution until no more ammonia gas was evolved. Then excess sodium hydroxide in the resulting solution required for neutralization‚ 24.30 mL of HCl 0.100M. Calculate the percentage purity of the sample. 1.16 Write the correct formulae/ions for: Potassium sulfite:………………. Dinitrogen pentoxide:……………. Nitrorous acid: ………………… Sodium hyperchlorite…………… Chloric acid………………… Hydride ion:………………… Coprous ions: ……………… Mercuric ion………………… 1.17 In acidic solution‚ dichromate ion will
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Acetate formula | CH3COO- | 5 | Ammonia formula | NH3 | 6 | Nitric acid formula | HNO3 | 7 | Phosphoric acid formula | H3PO4 | 8 | Sodium phosphate formula | Na3PO4 | 9 | Calcium carbonate formula | CaCO3 | 10 | Ammonium sulfate formula | (NH4)2SO4 | 11 | Carbonic acid formula | H2CO3 | 12 | Sodium bicarbonate formula | NaHCO3 | 13 | Sodium hydroxide formula | NaOH | 14 | Calcium hydroxide formula | Ca(OH)2 | 15 | Ethanol formula | C2H5OH | 16 | Hydrobromic acid formula |
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|Mechanism | |1. oxidation (aldehydes only): aldehyde ( carboxylic acid |n/a | | | | |reagents: potassium dichromate (K2Cr2O7) in sulphuric acid (H2SO4) | |
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sample that is unable to be oxidised biologically.Oxidation takes place on both the organic and inorganic component but as the organic component is more dominant‚ it is of more significant interest.In the COD test‚ the amount of oxidation that takes place depends on sample COD concentration‚ digestion time and reagent strength. It gives a measurement for the total organic carbon present in the sample.The open reflux test can be used for a large range of
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HKDSE CHEMISTRY – A Modern View (Chemistry) Experiment Workbook 5 Suggested answers Chapter 52 Importance of industrial processes Chapter 53 Rate equation Experiment 53.1 Determining the rate equation of a reaction using method of initial rate (A microscale experiment) 1 Chapter 54 Activation energy Experiment 54.1 Determining the activation energy of a chemical reaction 3 Chapter 55 Catalysis and industrial processes Experiment 55.1 Investigating the action of a catalyst 6 Experiment
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Hwa Chong Institution (High School) Secondary 4 End of Year Examinations Chemistry Revision Notes List of topics: 1. Atomic Structure 2. Separation Techniques 3. Chemical Bonds and Bonding (Ionic‚ Covalent) 4. Metals 5. Properties and structures of compounds 6. Qualitative Analysis 7. Acids‚ Bases and Salts 8. Chemical Periodicity 9. Chemical Calculations 10. Air and Environment 11. Electrochemistry (Including Redox reactions) 12. Thermochemistry 13. Rates of Reaction 14. Chemical
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