SULIT 1 4541/1 Peraturan Permarkahan CHEMISTRY 4541 Kertas 1 Ogos 2011 BAHAGIAN PENGURUSAN SEKOLAH BERASRAMA PENUH DAN SEKOLAH KECEMERLANGAN KEMENTERIAN PELAJARAN MALAYSIA PERATURAN PERMARKAHAN PEPERIKSAAN PERCUBAAN SIJIL PELAJARAN MALAYSIA 2011 CHEMISTRY TRIAL 2011 MARKING SCHEME PAPER 1 4541 /1 © Trial2011 Hak Cipta Sekolah Berasrama Penuh http://cikguadura.wordpress.com SULIT SULIT 2 SKEMA KERTAS 1 CHEMISTRY 4541/1 4541/1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
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fistula leaf were 15.2‚ 24.5‚ 43.8‚ 68.2‚ and 158.6 mg‚ respectively‚ with chloroform‚ petroleum ether‚ methanol‚ distilled water‚ and ethanol solvents. Evaluation of phytochemicals such as alkaloids‚ flavonoids‚ carbohydrates‚ glycosides‚ protein and amino acids‚ saponins‚ and triterpenoids revealed the presence of most of the constituent in polar extracts such as ethanol‚ methanol‚ and aqueous extracts compared with nonpolar extracts (petroleum ether and chloroform). However‚ flavonoids‚ proteins and
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What is yeast? To most people yeast is just something that is in the food that we eat; However to the scientific community yeast is much more then that. According to the Dictionary of Student Science yeast is a one-celled fungi that can cause the fermentation of carbohydrates‚ producing carbon dioxide and alcohol. ( ) Yeasts are found in the soil‚ in water‚ on the surface of plants‚ and on the skin of humans and other animals. Like other fungi‚ yeasts obtain food from the organic matter around
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OUTLINE: Effects if Alcohol on Drivers Performs The use of alcohol has been a major problem in our society A serious problem of alcohol is that of drunk drivers Facts About Alcohol Alcohol is a common name for chemical substances ethanol‚ grain alcohol or ethyl alcohol Not digested but absorbed into the bloodstream Alcohol is a major factor in nearly 41% of traffic accidents where some one is killed Nearly 60% of all Fatalities during holidays are alcohol related For drivers of all ages
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Comparison of the rate of reaction and yield of glycerol in saponification with different triglycerides Chemistry EE Candidate number: 0019 Word count: 3974 TABLE OF CONTENTS CONTENTS 2 INTRODUCTION 2 RESEARCH QUESTION 5 BACKGROUND INFORMATION 5 METHODOLOGY 10 DATA PRESENTATION AND PROCESSING 13 CONCLUSION 24 EVALUATION 24 BIBLIOGRAPHY 26 Introduction In 1779‚ Carl W. Scheele‚ a Swedish chemist‚ discovered a new transparent‚ syrupy liquid by heating olive oil and litharge . This
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sanitizer or hand antiseptic is a supplement or alternative to hand washing with soap and water. * Various preparations are available‚ including gel‚ foam‚ and liquid solutions. * The active ingredient in hand sanitizers may be isopropanol‚ ethanol‚ n-propanol‚ povidone-iodine. * Inactive ingredients in alcohol rubs typically include a thickening agent such as polyacrylic acid for alcohol gels‚ humectants such as glycerin for liquid rubs‚ propylene glycol‚ and essential oils of plants
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Bottles containing: glacial Ethanoic acid‚ Methanol‚ Ethanol‚ Propan-1-ol‚ • Propan-2-ol‚ Butan-1-ol‚ Butan-2-ol and Conc. Sulfuric acid. • 1g Salicylic acid • 10 ml Measuring cylinder • Test tubes • 250ml Beaker • One-hole rubber stopper • 50cm length of glass tubing to fit stopper • Hotplate • Safety glasses Method: 1. Set up a 250ml beaker two-thirds full of hot water on a hotplate. The beaker serves as a water bath 2. Pour 5ml of ethanol into a test tube. 3. Add 2.5ml of glacial ethanoic acid
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Different solvents provided extracts with different colour values at varying temperatures. At 50⁰C‚ the maximum colour value was found to be in the extract obtained using ethanol as the solvent. As shown in Figure 4.5‚ it could be clearly analyzed that different colour values are obtained on extraction with different solvents. Ethanol gave the maximum colour value i.e. 308.6; chloroform gave a slightly less value of 296.6; followed by methanolic extract giving 249.3
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Chemistry Project CERTIFICATETHIS IS TO CERTIFY THAT Kshitij Navet HAS SATISFACTORILY COMPLETED THE CHEMISTRY PROJECT FOR THE YEAR 2012-2013INTERNALEXAMINER‚ SIGNATURE EXTERNAL EXAMINER‚ SIGNATURE PRINCIPAL SCHOOL STAMP | ACKNOWLEDGEMENT
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INTERNATIONALE PHARMACEUTICA SCIENCIA | Jan-March 2011 | Vol. 1 | Issue 1 | Available online http://www.ipharmsciencia.com ©2011 IPS REVIEW ARTICLE Phytochemical screening and Extraction: A Review ABSTRACT Plants are a source of large amount of drugs comprising to different groups such as antispasmodics‚ emetics‚ anti-cancer‚ antimicrobials etc. A large number of the plants are claimed to possess the antibiotic properties in the traditional system and are also used extensively by the tribal people
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