3-perylenepentanol‚ M4 39‚ 51 To a solution of 3-perylenepent-4-ynol‚ M3 (0.32 g‚ 0.957 mmol) in THF (20 mL)‚ Pd/C (600 mg‚ 3 wt% on activated carbon) was added. Nitrogen gas was turned off‚ hydrogen gas balloons were used to supply H2 gas to the flask. The reaction mixture was stirred for 15 h under hydrogen atmosphere at room temperature. Ethyl acetate was added to the reaction mixture and the Pd/C was removed by filtration. Solvent was removed in vacuo to afford 3-perylenepentanol as yellow solid
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1) What is the purpose of ice or cold water? To cool down the gas so that it condenses and turns into a liquid. 2) when the gas collecting tube is upside down‚ give a property of this gas. It is less dense than air. 3) Why is a pencil used in drawing the origin line in chromatography? If pen was used‚ it will dissolve giving colours and so‚ the experiment won’t be accurate. Pencil doesn’t interfere with the results. 4) When using ethanol‚ give a better apparatus arrangement‚ and why? Cover
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Chemistry Unit 1 – Revision Questions Chemistry 1A 1) Define an element. How many are there in the Periodic Table? 2) Write a table with the charges and masses of protons‚ neutrons and electrons. 3) Define atomic number and mass number. 4) Draw electron (energy level) diagrams for Be‚ S‚ Al‚ Cl and K. Also‚ write down the number of protons and neutrons for each. Finally‚ write the symbols (with mass no. and atomic no.) 5) Why have all Group 7 elements (halogens) got similar chemical properties
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place which in turn produces electrical energy which finally drives the alarm or radio. The two significant contributions made by chemistry towards our lifestyle is the protection of our health and hygiene. The purification our water by process of chlorination‚ dental cleanliness from toothpaste‚ sterilization‚ the control and the cure of disease are all a part of daily living discovered and created by chemistry. These discoveries make up a major component for the protection of our health and hygiene
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Chemistry Revision F331 Isotopes - atoms with the same atomic number‚ but different mass numbers 131I - radioactive tracer for thyroid. 99Tc for tumours. Radioisotopes - gamma emitters & short half life - long enough to detect‚ but not long enough for damage. Beta particles emitters are more useful than alpha particle emitters because they penetrate more and so are more easily detected. Also‚ less damaging. The half life is the time taken for half the isotope to decay Mass left = initial
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) 0620/01 October/November 2008 45 Minutes *6400528663* READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples‚ paper clips‚ highlighters‚ glue or correction fluid. Write your name‚ Centre number and candidate number on the
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Dr. GEORGE ROMBO Cholera This is an infection of the small intestine caused by bacterium vibrio cholera. Transmission is mostly from the fecal contamination of food and water that is caused by poor sanitation Susceptibility About 100 million bacteria must typically be ingested to cause cholera in a normal healthy adult. Children are also more susceptible with 2- 4 year old having the highest rates of infection Individual susceptibility to cholera is also affected by their blood type with
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reducing the risk of diarrheal disease. Through the S E M working groups such as Health Officials eg. Nurses‚ and Teachers will educate on house hold water purification intervention procedures for Boiling‚ exposure to sunlight‚ UV tradition (lamps)‚ Chlorination‚ filtration‚ and UV rays disinfectant. Intervention for proper sanitation will also be given. Other groups such as Clubs‚ Village council officials will monitor and assist community members where
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Shiga toxin results in a more severe form of cramps‚ diarrhea‚ etc. VII. Treatment & Prevention. • Treatment o Supportive care.. watch for dehydration…etc o Use of antimicrobial drugs to shorten the length of the disease. • Prevention o Chlorination of water o Correct disposal of sewage VIII. References • Bauman W‚ Robert.
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sedimentation process‚ the water to be treated is passed through a media consisting of several layers of graded sand and anthracite charcoal to screen out all foreign particles which did not settle down in sedimentation basin. Maynilad use the chlorination method for disinfection purposes‚ having a dosage of only 0.3 – 1.5mgl of chlorine. Finally‚ the water sent to storage and ready for the distribution. Then‚ we have started the plant
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