State the observable change in this test and explain your answer. (8 marks) 3 4 4. HKCEE 1998 Q5 Each of five unlabelled bottles contains one of the following chemicals: 2 M hydrochloric acid 2 M nitric acid 2 M sodium chloride solution 2 M sodium hydroxide solution distilled water Suggest how you would carry out tests to identify the
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Organic chemistry studies carbon compounds‚ but a few carbon compounds such as carbon monoxide‚ carbon dioxide‚ metal carbonates‚ and carbon disulphide traditionally come under the umbrella of inorganic chemistry. INTRODUCTORY 1. Give the following for the compound propane C3H8: (a) Full structural formula (b) Skeletal formula 2. Draw all the possible isomers of hexane C6H14 and give the name of each. 3. Draw the structural formulae for each of the following alkanes: (a) 2‚2- dimethylbutane
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Materials and Reagents: 2ml 1M Sulfuric Acid 2ml of 0.1M Potassium Dichromate Distilled Water Pipettes Volumetric Flask Test Tubes Procedure: 1. Prepare 1 ml glucose solution and place in test tubes 2. Add 2ml of 1M Sulfuric Acid solution 3. Add 2ml of 0.1M Potassium Dichromate solution 4. Start timing until the color disappear Results and Discussion: The fastest concentration of glucose to react with oxidation-reduction is the 1.0% concentration while the slowest to react
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Subject Content Most of the objectives specified in this section relate to Knowledge with Understanding‚ although some indication has been given as to where the skills of Handling Information and Solving Problems may be developed. Teachers are reminded that‚ in the written papers‚ 40% of the marks are allocated to these higher ’thinking’ skills. In almost every section‚ students should therefore be given practice at dealing with unfamiliar situations so that these higher thinking skills can be developed
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www.kalvisolai.com 5 Mark Compulsory Problems with Solution 1 +2 CHEMISTRY Q. 70 Compulsory Problems with Solution Problems are solved in easiest way (As per Government Answer Key) www.kalvisolai.com 5 Mark Compulsory Problems with Solution 2 SALIENT FEATURES Dear Students ❆ Q.No: 70 is asked as compulsory problem in Govt Exam. ❆ Two problems to be answered out of four problems. ❆ To simplify the problem‚ hints and expected compounds related to molecular formula‚ general formula are
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Principle: The organic matter present in the sample gets oxidized completely by dichromate in the presence of Sulphuric acid to give co2 and H2o. The excess dichromate remaining after reaction is titrated with ferrous ammonium sulphate. The dichromate consumed gives oxygen required to oxidation of organic matter. Apparatus required: Reflux apparatus‚ heating mantle‚ Burette Reagents: potassium dichromate‚ Sulphuric acid‚ silver sulphate‚ ferrous ammonium sulphate‚ ferroin‚ mercuric
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hydroxide Ans: Add ammonium hydroxide to the given substance‚ calcium nitrate does not form any ppt. with ammonium hydroxide. But lead nitrate forms chalky white ppt. With ammonium hydroxide b)Calcium nitrate and lead nitrate using sodium hydroxide solution Ans: Add sodium hydroxide to the given substance‚ Calcium nitrate forms milky white ppt. which is insoluble in excess. Lead nitrate forms chalky white ppt. Which is soluble in excess. c)Zinc nitrate and lead nitrate using ammonium hydroxide solution
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Abstract Oxidation was found for primary alcohol. When 6 drops of potassium dichromate and 1 drop of concentrated sulfuric acid were added to 1-pentanol‚ the color of 1-pentaol turned into dark green. In second experiment‚ precipitation was found when 6 drops of 2‚4-dinitrophenylhydrazine were added to both 5 drops of benzaldehyde and 5 drops of acetophenone. Based on these data‚ it is possible to find alcohol by oxidation and aldehyde by observing precipitation Introduction This experiments
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at equilibrium. However‚ only concentration and temperature were observed in this experiment. Part 1: Cobalt Complexes Table 1 shows the color change of the cobalt chloride solutions as water‚ different concentrations of hydrochloric acid‚ and sodium chloride were added as well as the number of drops that caused the color change. Color of cobalt chloride in ethanol: Violet Color of cobalt chloride in water: Red Medicine Dropper Calibration: 1 mL = 16 drops Table 1. Cobalt Complexes
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functional group in aldehydes is –CHO on the end of a chain e.g. ethanal CH3CHO • The functional group in ketones is C=O not at the end of a chain e.g. propanone CH3COCH3 2. AS Recap • Primary alcohols are oxidised by acidified potassium dichromate. An aldehyde is produced first and this can be further oxidised to a carboxylic acid. To get the aldehyde‚ it must be distilled off as it is formed. To get the acid‚ heat under reflux. • Secondary alcohols are oxidised to ketones by acidified
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