i am so afraid of any kind of insect especially cockroaches and i want to act before i have a problem with it. What do you suggest i do to prevent the insects from even approaching my house? If this happens‚ how do i minimize the problem? Thanks There is nothing more annoying than having a houseplant with an insect infestation and not knowing what to do about it. To prevent destruction from pesky insects‚ though‚ you must know what you are up against and what is effective to keep the pests away
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A. List of Chemical Reagents/Substances 400 ml Ethanol 400 ml Petroleum Ether 1000ml Sesame oil 200 g Beeswax 10 g Potassium sorbate 50 ml Rose oil 20 ml Vitamin E oil 20 ml Stearic acid B. List of Glasswares/Materials 2pcs. Mortar and Pestle 50pcs. Filter papers Beakers: 3pcs. 1000ml 2pcs. 400ml 2pcs. 100ml Graduated cylinders: 2pcs. 50ml 2pcs: 10ml Oven Amber bottles: 2pcs. 60ml 2pcs. 120ml Soxhlet apparatus Iron stand Iron clamp
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Bullying has been quite a growing problem in today’s society. Bullying is defined as any repeated negative activity or aggression intended to harm or bother someone who is perceived by peers as being less physically or psychologically powerful than the aggressor. The particular concern with the frequent bullying of children is that it will have an adverse impact on victims scholastic achievement‚ desire to attend school‚ and self-esteem (Olweus D.‚ Rigby K). Bullies are people. Bullies want power
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The Special Theory of Relativity Can Be Disproved Experimentally Gennady Sokolov‚ Vitali Sokolov. It is true that you may fool all the people some of the time; you can even fool some of the people all of the time; but you can’t fool all of the people all the time. Abraham Lincoln (USA‚ 1809-1865). Content 1. What the special relativity states. What is the postulate of the invariability 2. The optical experiments and observations that forced to receive the postulate of invariability of light speed
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Introduction The Diels-Alder Reaction is a reaction used in organic chemistry that builds rings very efficiently (1)‚ this cycloaddition process allows for the stereoselective formation of cyclohexene rings possessing as many as four contiguous stereogenic centers (3). This reaction occurs without intermediates‚ in a single step‚ which explains the stereospecificity due to substituents not being given the chance to “switch around”. (1)These six membered rings are synthesized by reacting a dienophile
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The goals of this experiment are to determine if the products derived from amide synthesis and Williamson Ether Synthesis are identical‚ and if one of the synthetic routes is more advantageous than the other. In Part 1‚ an attempt to synthesize acteophenetidin crystals by amide synthesis was made. We began by removing the colored impurities from the p-Phenetidine (reddish-brown) by placing 2g of the sample in 38 mL of hydrochloric acid and heating the solution to boiling point. Upon reaching just
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Name: Chen Yao Le Lab Group: Tues Email: A0111185@nus.edu.sg Matriculation Number: A0111185R Date of Experiment: 17 February 2015 Experiment 6: Synthesis‚ Electronic Spectra‚ Structural Isomerism: Octahedral Co(III) complexes with Chloride and Ethylenediamine Ligands Abstract: In this experiment‚ Δ/Λ-[Co(en)3]Cl3∙4H2O was synthesized and the absorbance in UV-vis spectrum was recorded
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145.2°C Melting point -30.6°C Flash point 31°C (87 F) Autoignition temperature 490°C Relative density 0.9059 at 25°C Vapour pressure 10 mm at 35°C Saturation vapour concentration 6600 ppm at 20°C practically insoluble in water; Soluble in alcohol‚ ether‚ methanol‚ acetone and carbon disulfide. Explosive limits in air 1.1 to 6.1% by volume in air Table 1.4: The table of the properties of Styrene.
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Chikungunya Fact sheet N°327 March 2008 ________________________________________ Key facts • Chikungunya is a viral disease that is spread by mosquitoes. It causes fever and severe joint pain. Other symptoms include muscle pain‚ headache‚ nausea‚ fatigue and rash. • The disease shares some clinical signs with dengue‚ and can be misdiagnosed in areas where dengue is common. • There is no cure for the disease. Treatment is focused on relieving the symptoms. • The proximity of mosquito breeding
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Developing Fuels * All gases take up the same volume under the same conditions. AT room temperature and room pressure this volume is 24 dm3. * Number of moles= volume in dm3 24 * Balanced equations can also be used to work out gas volumes. In the equations: 2Na + 2H2O 2NaOH + H2‚ where 15g of sodium is reacted‚ you can work out the volume of gas from working out the number of moles in 15g Na = 0.65 mol. Then you see that 2 mol of Na 1mol of H2‚ Thus 0.65 mol Na 0.325 mol H2. 0.325
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