M. S. Ntamila and A. Hassanali University of Dares Salaam P.O. BOX 35061 Tanzania kolation of Oil of Clove and Separation of Eugenol and Acetyl Eugenol . An instructive experiment for beginning chemistry undergraduates chloride‚ and hydroxamic ester tests‚ and the preparation of the henzovl derivative of eupenol. Finally‚ ir spectra of the two components are examined‚ and the information ohtained comoared with that from chemical tests. Practical Detalls Crush about 30-35 g of cloves with pestle
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in aspirin tablets hence 4 commercial tablets were taken to determine its purity using a known volume of standard sodium hydroxide‚ due to the fact that it is only readily hydrolysed (hydrolysis: the breakup of molecules with the use of water) by alkalis and was then tittered with a standard solution of Hydrochloric Acid. *Referencing* Method: * A 250cm3 conical flask was weighed and its weight was recorded. Then 4 aspirin tablets were placed in the weighed conical flask and reweighed (weight
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washing soda is heated above 1000C temp.? 21. Write an equation to show the reaction between plaster of Paris and water. 22. What is milk of lime? 23. Give the names of two natural indicator. 24. What is the difference between an alkali and a base? 25. Distinguish between cation and an Anion Short answer questions (2 marks) 26. Write the chemical formula of washing soda. What happens when crystals of washing soda are
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Used Fabric Softener as Alternate Air Freshener Submitted to: Sir Elwin Fernandez Background of the Study People nowadays‚ rely on factory made or ready-to-use products. Even if they spend a lot‚ it is alright for them because it is more easy to buy than to make one. Just like air fresheners. Air freshener is one of the important things that you should always have at home. We need this to eliminate bad odours coming from garbage‚ fishy foods
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Robert Bunsen was born on March 31‚ 1811 in Gottingen‚ Germany. He was the youngest of four sons. Robert started schooling in the city of Holzminden‚ and then studied chemistry at Gottingen. Bunsen was awarded his doctorate in 1830 for a dissertation on different kinds of hygrometer. He was only 19 at this point in his life. Following being awarded his doctorate‚ he immediately set off on extensive travels that took him through Germany and Paris and eventually to Vienna from 1830 to 1833. All of
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UNIT 1 – What is Biology? What is biology? the study of living organisms‚ divided into many specialized fields that cover their morphology‚ physiology‚ anatomy‚ behavior‚ origin‚ and distribution. Biotic vs. abiotic factors Biotic- living factors i.e. plants‚ animals‚ fungi‚ bacteria‚ and protest Abiotic- nonliving factors that affect living organisms. Environmental factors: habitat & weather 7 Characteristics of living things (Bio 3 Book Ch. 1) Uni-cellular vs. Multi-cellular Uni-Cellular-
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Sedimentary rocks in Pakistan range in age from Precambrian to Miocene i.e from oldest to youngest on the geological time scale form 542 million years to latest. Luckily for geoscientists all of them are exposed in different parts of the country. Lithologically they constitute sandstone‚ limestone‚ shale and mixed lithologies of them all. These rocks are exposed all along the mountain ranges from Islamabad in north to Karachi in the south. Igneous rocks are exposed north of Peshawar or only at
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the making of spaceships. As far as bonding goes‚ metals easily lose their outer shell electrons‚ or valence electrons. This property is what gives them their ability to easily conduct heat and electricity.There are sub-groups of metals called the alkali metals‚ alkaline earth metals‚ and transition metalsNon-metals: Bad conductor of heat and electricity (exception: Graphite‚ a form of carbon). Don’t have shining luster (Exception: Iodine). Dull appearance. May be solids‚ liquids‚ or gas at
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elements in the same horizontal row. Seventy five percent of the table is made up of metals‚ and a couple of the columns on the right of the table have gases. There are only two elements that are liquids- mercury and bromine. Column 1 contains the alkali metals‚ which suddenly combust when exposed to air or water. Columns 3-12 are the transition metals‚ which contain heavier atoms‚ which are more flexible in how they organize their electrons. Column 17 is made up of the more reactive gases- the halogens
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11_5070_11/2RP © UCLES 2011 [Turn over 2 1 In a titration between an acid (in the burette) and an alkali‚ you may need to re-use the same titration flask. Which is the best procedure for rinsing the flask? A B C D 2 Rinse with distilled water and then with the alkali. Rinse with tap water and then with distilled water. Rinse with tap water and then with the acid. Rinse with the alkali. The labels fell off two bottles each containing a colourless solution‚ one of which was sodium carbonate
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